We Keep Coding

Compare dates in javascript which use 'D MMM YY - HH.MM.SS' formatting [duplicate]

Can someone suggest a way to compare the values of two dates greater than, less than, and not in the past using JavaScript? The values will be coming from text boxes.

The Date object will do what you want - construct one for each date, then compare them using the >, <, <= or >=.
The ==, !=, ===, and !== operators require you to use date.getTime() as in
var d1 = new Date();
var d2 = new Date(d1);
var same = d1.getTime() === d2.getTime();
var notSame = d1.getTime() !== d2.getTime();
to be clear just checking for equality directly with the date objects won't work
var d1 = new Date();
var d2 = new Date(d1);
console.log(d1 == d2); // prints false (wrong!)
console.log(d1 === d2); // prints false (wrong!)
console.log(d1 != d2); // prints true (wrong!)
console.log(d1 !== d2); // prints true (wrong!)
console.log(d1.getTime() === d2.getTime()); // prints true (correct)
I suggest you use drop-downs or some similar constrained form of date entry rather than text boxes, though, lest you find yourself in input validation hell.
For the curious, date.getTime() documentation:
Returns the numeric value of the specified date as the number of milliseconds since January 1, 1970, 00:00:00 UTC. (Negative values are returned for prior times.)

Compare < and > just as usual, but anything involving == or === should use a + prefix. Like so:
const x = new Date('2013-05-23');
const y = new Date('2013-05-23');
// less than, greater than is fine:
console.log('x < y', x < y); // false
console.log('x > y', x > y); // false
console.log('x <= y', x <= y); // true
console.log('x >= y', x >= y); // true
console.log('x === y', x === y); // false, oops!
// anything involving '==' or '===' should use the '+' prefix
// it will then compare the dates' millisecond values
console.log('+x === +y', +x === +y); // true

The easiest way to compare dates in javascript is to first convert it to a Date object and then compare these date-objects.
Below you find an object with three functions:
dates.compare(a,b)
Returns a number:
-1 if a < b
0 if a = b
1 if a > b
NaN if a or b is an illegal date
dates.inRange (d,start,end)
Returns a boolean or NaN:
true if d is between the start and end (inclusive)
false if d is before start or after end.
NaN if one or more of the dates are illegal.
dates.convert
Used by the other functions to convert their input to a date object. The input can be
a date-object : The input is returned as is.
an array: Interpreted as [year,month,day]. NOTE month is 0-11.
a number : Interpreted as number of milliseconds since 1 Jan 1970 (a timestamp)
a string : Several different formats is supported, like "YYYY/MM/DD", "MM/DD/YYYY", "Jan 31 2009" etc.
an object: Interpreted as an object with year, month and date attributes. NOTE month is 0-11.
.
// Source: http://stackoverflow.com/questions/497790
var dates = {
convert:function(d) {
// Converts the date in d to a date-object. The input can be:
// a date object: returned without modification
// an array : Interpreted as [year,month,day]. NOTE: month is 0-11.
// a number : Interpreted as number of milliseconds
// since 1 Jan 1970 (a timestamp)
// a string : Any format supported by the javascript engine, like
// "YYYY/MM/DD", "MM/DD/YYYY", "Jan 31 2009" etc.
// an object : Interpreted as an object with year, month and date
// attributes. **NOTE** month is 0-11.
return (
d.constructor === Date ? d :
d.constructor === Array ? new Date(d[0],d[1],d[2]) :
d.constructor === Number ? new Date(d) :
d.constructor === String ? new Date(d) :
typeof d === "object" ? new Date(d.year,d.month,d.date) :
NaN
);
},
compare:function(a,b) {
// Compare two dates (could be of any type supported by the convert
// function above) and returns:
// -1 : if a < b
// 0 : if a = b
// 1 : if a > b
// NaN : if a or b is an illegal date
// NOTE: The code inside isFinite does an assignment (=).
return (
isFinite(a=this.convert(a).valueOf()) &&
isFinite(b=this.convert(b).valueOf()) ?
(a>b)-(a<b) :
NaN
);
},
inRange:function(d,start,end) {
// Checks if date in d is between dates in start and end.
// Returns a boolean or NaN:
// true : if d is between start and end (inclusive)
// false : if d is before start or after end
// NaN : if one or more of the dates is illegal.
// NOTE: The code inside isFinite does an assignment (=).
return (
isFinite(d=this.convert(d).valueOf()) &&
isFinite(start=this.convert(start).valueOf()) &&
isFinite(end=this.convert(end).valueOf()) ?
start <= d && d <= end :
NaN
);
}
}

The relational operators < <= > >= can be used to compare JavaScript dates:
var d1 = new Date(2013, 0, 1);
var d2 = new Date(2013, 0, 2);
d1 < d2; // true
d1 <= d2; // true
d1 > d2; // false
d1 >= d2; // false
However, the equality operators == != === !== cannot be used to compare (the value of) dates because:
Two distinct objects are never equal for either strict or abstract comparisons.
An expression comparing Objects is only true if the operands reference the same Object.
You can compare the value of dates for equality using any of these methods:
var d1 = new Date(2013, 0, 1);
var d2 = new Date(2013, 0, 1);
/*
* note: d1 == d2 returns false as described above
*/
d1.getTime() == d2.getTime(); // true
d1.valueOf() == d2.valueOf(); // true
Number(d1) == Number(d2); // true
+d1 == +d2; // true
Both Date.getTime() and Date.valueOf() return the number of milliseconds since January 1, 1970, 00:00 UTC. Both Number function and unary + operator call the valueOf() methods behind the scenes.

By far the easiest method is to subtract one date from the other and compare the result.
var oDateOne = new Date();
var oDateTwo = new Date();
alert(oDateOne - oDateTwo === 0);
alert(oDateOne - oDateTwo < 0);
alert(oDateOne - oDateTwo > 0);

Comparing dates in JavaScript is quite easy... JavaScript has built-in comparison system for dates which makes it so easy to do the comparison...
Just follow these steps for comparing 2 dates value, for example you have 2 inputs which each has a Date value in String and you to compare them...
1. you have 2 string values you get from an input and you'd like to compare them, they are as below:
var date1 = '01/12/2018';
var date2 = '12/12/2018';
2. They need to be Date Object to be compared as date values, so simply convert them to date, using new Date(), I just re-assign them for simplicity of explanation, but you can do it anyway you like:
date1 = new Date(date1);
date2 = new Date(date2);
3. Now simply compare them, using the > < >= <=
date1 > date2; //false
date1 < date2; //true
date1 >= date2; //false
date1 <= date2; //true

Compare day only (ignoring time component):
Date.prototype.sameDay = function(d) {
return this.getFullYear() === d.getFullYear()
&& this.getDate() === d.getDate()
&& this.getMonth() === d.getMonth();
}
Usage:
if(date1.sameDay(date2)) {
// highlight day on calendar or something else clever
}
I no longer recommend modifying the prototype of built-in objects. Try this instead:
function isSameDay(d1, d2) {
return d1.getFullYear() === d2.getFullYear() &&
d1.getDate() === d2.getDate() &&
d1.getMonth() === d2.getMonth();
}
console.log(isSameDay(new Date('Jan 15 2021 02:39:53 GMT-0800'), new Date('Jan 15 2021 23:39:53 GMT-0800')));
console.log(isSameDay(new Date('Jan 15 2021 10:39:53 GMT-0800'), new Date('Jan 16 2021 10:39:53 GMT-0800')));
N.B. the year/month/day will be returned for your timezone; I recommend using a timezone-aware library if you want to check if two dates are on the same day in a different timezone.
e.g.
> (new Date('Jan 15 2021 01:39:53 Z')).getDate() // Jan 15 in UTC
14 // Returns "14" because I'm in GMT-08

what format?
If you construct a Javascript Date object, you can just subtract them to get a milliseconds difference (edit: or just compare them) :
js>t1 = new Date()
Thu Jan 29 2009 14:19:28 GMT-0500 (Eastern Standard Time)
js>t2 = new Date()
Thu Jan 29 2009 14:19:31 GMT-0500 (Eastern Standard Time)
js>t2-t1
2672
js>t3 = new Date('2009 Jan 1')
Thu Jan 01 2009 00:00:00 GMT-0500 (Eastern Standard Time)
js>t1-t3
2470768442
js>t1>t3
true

Note - Compare Only Date Part:
When we compare two date in javascript. It takes hours, minutes and seconds also into consideration.. So If we only need to compare date only, this is the approach:
var date1= new Date("01/01/2014").setHours(0,0,0,0);
var date2= new Date("01/01/2014").setHours(0,0,0,0);
Now: if date1.valueOf()> date2.valueOf() will work like a charm.

The simple way is,
var first = '2012-11-21';
var second = '2012-11-03';
if (new Date(first) > new Date(second) {
.....
}

SHORT ANSWER
Here is a function that return {boolean} if the from dateTime > to dateTime Demo in action
var from = '08/19/2013 00:00'
var to = '08/12/2013 00:00 '
function isFromBiggerThanTo(dtmfrom, dtmto){
return new Date(dtmfrom).getTime() >= new Date(dtmto).getTime() ;
}
console.log(isFromBiggerThanTo(from, to)); //true
Explanation
jsFiddle
var date_one = '2013-07-29 01:50:00',
date_two = '2013-07-29 02:50:00';
//getTime() returns the number of milliseconds since 01.01.1970.
var timeStamp_date_one = new Date(date_one).getTime() ; //1375077000000
console.log(typeof timeStamp_date_one);//number
var timeStamp_date_two = new Date(date_two).getTime() ;//1375080600000
console.log(typeof timeStamp_date_two);//number
since you are now having both datetime in number type
you can compare them with any Comparison operations
( >, < ,= ,!= ,== ,!== ,>= AND <=)
Then
if you are familiar with C# Custom Date and Time Format String this library should do the exact same thing and help you format your date and time dtmFRM whether you are passing in date time string or unix format
Usage
var myDateTime = new dtmFRM();
alert(myDateTime.ToString(1375077000000, "MM/dd/yyyy hh:mm:ss ampm"));
//07/29/2013 01:50:00 AM
alert(myDateTime.ToString(1375077000000,"the year is yyyy and the day is dddd"));
//this year is 2013 and the day is Monday
alert(myDateTime.ToString('1/21/2014', "this month is MMMM and the day is dd"));
//this month is january and the day is 21
DEMO
all you have to do is passing any of these format pacified in the library js file

You can use this code:
var firstValue = "2012-05-12".split('-');
var secondValue = "2014-07-12".split('-');
var firstDate=new Date();
firstDate.setFullYear(firstValue[0],(firstValue[1] - 1 ),firstValue[2]);
var secondDate=new Date();
secondDate.setFullYear(secondValue[0],(secondValue[1] - 1 ),secondValue[2]);
if (firstDate > secondDate)
{
alert("First Date is greater than Second Date");
}
else
{
alert("Second Date is greater than First Date");
}
And also check the MDN article for the Date class.

function datesEqual(a, b)
{
return (!(a>b || b>a))
}

var date = new Date(); // will give you todays date.
// following calls, will let you set new dates.
setDate()
setFullYear()
setHours()
setMilliseconds()
setMinutes()
setMonth()
setSeconds()
setTime()
var yesterday = new Date();
yesterday.setDate(...date info here);
if(date>yesterday) // will compare dates

BEWARE THE TIMEZONE
A javascript date has no notion of timezone. It's a moment in time (ticks since the epoch) with handy functions for translating to and from strings in the "local" timezone. If you want to work with dates using date objects, as everyone here is doing, you want your dates to represent UTC midnight at the start of the date in question. This is a common and necessary convention that lets you work with dates regardless of the season or timezone of their creation. So you need to be very vigilant to manage the notion of timezone, particularly when you create your midnight UTC Date object.
Most of the time, you will want your date to reflect the timezone of the user. Click if today is your birthday. Users in NZ and US click at the same time and get different dates. In that case, do this...
// create a date (utc midnight) reflecting the value of myDate and the environment's timezone offset.
new Date(Date.UTC(myDate.getFullYear(),myDate.getMonth(), myDate.getDate()));
Sometimes, international comparability trumps local accuracy. In that case, do this...
// the date in London of a moment in time. Device timezone is ignored.
new Date(Date.UTC(myDate.getUTCYear(), myDate.getyUTCMonth(), myDate.getUTCDate()));
Now you can directly compare your date objects as the other answers suggest.
Having taken care to manage timezone when you create, you also need to be sure to keep timezone out when you convert back to a string representation. So you can safely use...
toISOString()
getUTCxxx()
getTime() //returns a number with no time or timezone.
.toLocaleDateString("fr",{timezone:"UTC"}) // whatever locale you want, but ALWAYS UTC.
And totally avoid everything else, especially...
getYear(),getMonth(),getDate()

Via Moment.js
Jsfiddle: http://jsfiddle.net/guhokemk/1/
function compare(dateTimeA, dateTimeB) {
var momentA = moment(dateTimeA,"DD/MM/YYYY");
var momentB = moment(dateTimeB,"DD/MM/YYYY");
if (momentA > momentB) return 1;
else if (momentA < momentB) return -1;
else return 0;
}
alert(compare("11/07/2015", "10/07/2015"));
The method returns 1 if dateTimeA is greater than dateTimeB
The method returns 0 if dateTimeA equals dateTimeB
The method returns -1 if dateTimeA is less than dateTimeB

Just to add yet another possibility to the many existing options, you could try:
if (date1.valueOf()==date2.valueOf()) .....
...which seems to work for me. Of course you do have to ensure that both dates are not undefined...
if ((date1?date1.valueOf():0)==(date2?date2.valueOf():0) .....
This way we can ensure that a positive comparison is made if both are undefined also, or...
if ((date1?date1.valueOf():0)==(date2?date2.valueOf():-1) .....
...if you prefer them not to be equal.

If following is your date format, you can use this code:
var first = '2012-11-21';
var second = '2012-11-03';
if(parseInt(first.replace(/-/g,""),10) > parseInt(second.replace(/-/g,""),10)){
//...
}
It will check whether 20121121 number is bigger than 20121103 or not.

Subtract two date get the difference in millisecond, if you get 0 it's the same date
function areSameDate(d1, d2){
return d1 - d2 === 0
}

Say you got the date objects A and B, get their EPOC time value, then subtract to get the difference in milliseconds.
var diff = +A - +B;
That's all.

One way to compare two dates is to use the dates.js library.
The Date.compare(Date date1, Date date2) method that returns a number which means the one of following result:
-1 = date1 is less than date2.
0 = values are equal.
1 = date1 is greater than date2.

Performance
Today 2020.02.27 I perform tests of chosen solutions on Chrome v80.0, Safari v13.0.5 and Firefox 73.0.1 on MacOs High Sierra v10.13.6
Conclusions
solutions d1==d2 (D) and d1===d2 (E) are fastest for all browsers
solution getTime (A) is faster than valueOf (B) (both are medium fast)
solutions F,L,N are slowest for all browsers
Details
In below snippet solutions used in performance tests are presented. You can perform test in you machine HERE
function A(d1,d2) {
return d1.getTime() == d2.getTime();
}
function B(d1,d2) {
return d1.valueOf() == d2.valueOf();
}
function C(d1,d2) {
return Number(d1) == Number(d2);
}
function D(d1,d2) {
return d1 == d2;
}
function E(d1,d2) {
return d1 === d2;
}
function F(d1,d2) {
return (!(d1>d2 || d2>d1));
}
function G(d1,d2) {
return d1*1 == d2*1;
}
function H(d1,d2) {
return +d1 == +d2;
}
function I(d1,d2) {
return !(+d1 - +d2);
}
function J(d1,d2) {
return !(d1 - d2);
}
function K(d1,d2) {
return d1 - d2 == 0;
}
function L(d1,d2) {
return !((d1>d2)-(d1<d2));
}
function M(d1,d2) {
return d1.getFullYear() === d2.getFullYear()
&& d1.getDate() === d2.getDate()
&& d1.getMonth() === d2.getMonth();
}
function N(d1,d2) {
return (isFinite(d1.valueOf()) && isFinite(d2.valueOf()) ? !((d1>d2)-(d1<d2)) : false );
}
// TEST
let past= new Date('2002-12-24'); // past
let now= new Date('2020-02-26'); // now
console.log('Code d1>d2 d1<d2 d1=d2')
var log = (l,f) => console.log(`${l} ${f(now,past)} ${f(past,now)} ${f(now,now)}`);
log('A',A);
log('B',B);
log('C',C);
log('D',D);
log('E',E);
log('G',G);
log('H',H);
log('I',I);
log('J',J);
log('K',K);
log('L',L);
log('M',M);
log('N',N);
p {color: red}
<p>This snippet only presents tested solutions (it not perform tests itself)</p>
Results for chrome

In order to create dates from free text in JavaScript you need to parse it into the Date object.
You could use Date.parse() which takes free text and tries to convert it into a new date but if you have control over the page I would recommend using HTML select boxes instead or a date picker such as the YUI calendar control or the jQuery UI Datepicker.
Once you have a date, as other people have pointed out, you can use simple arithmetic to subtract the dates and convert it back into a number of days by dividing the number (in seconds) by the number of seconds in a day (60*60*24 = 86400).

var date_today=new Date();
var formated_date = formatDate(date_today);//Calling formatDate Function
var input_date="2015/04/22 11:12 AM";
var currentDateTime = new Date(Date.parse(formated_date));
var inputDateTime = new Date(Date.parse(input_date));
if (inputDateTime <= currentDateTime){
//Do something...
}
function formatDate(date) {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? 'PM' : 'AM';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
hours = hours < 10 ? '0'+hours : hours ;
minutes = minutes < 10 ? '0'+minutes : minutes;
var strTime = hours+":"+minutes+ ' ' + ampm;
return date.getFullYear()+ "/" + ((date.getMonth()+1) < 10 ? "0"+(date.getMonth()+1) :
(date.getMonth()+1) ) + "/" + (date.getDate() < 10 ? "0"+date.getDate() :
date.getDate()) + " " + strTime;
}

An Improved version of the code posted by "some"
/* Compare the current date against another date.
*
* #param b {Date} the other date
* #returns -1 : if this < b
* 0 : if this === b
* 1 : if this > b
* NaN : if a or b is an illegal date
*/
Date.prototype.compare = function(b) {
if (b.constructor !== Date) {
throw "invalid_date";
}
return (isFinite(this.valueOf()) && isFinite(b.valueOf()) ?
(this>b)-(this<b) : NaN
);
};
usage:
var a = new Date(2011, 1-1, 1);
var b = new Date(2011, 1-1, 1);
var c = new Date(2011, 1-1, 31);
var d = new Date(2011, 1-1, 31);
assertEquals( 0, a.compare(b));
assertEquals( 0, b.compare(a));
assertEquals(-1, a.compare(c));
assertEquals( 1, c.compare(a));

I usually store Dates as timestamps(Number) in databases.
When I need to compare, I simply compare among those timestamps or
convert it to Date Object and then compare with > <if necessary.
Note that == or === does not work properly unless your variables are references of the same Date Object.
Convert those Date objects to timestamp(number) first and then compare equality of them.
Date to Timestamp
var timestamp_1970 = new Date(0).getTime(); // 1970-01-01 00:00:00
var timestamp = new Date().getTime(); // Current Timestamp
Timestamp to Date
var timestamp = 0; // 1970-01-01 00:00:00
var DateObject = new Date(timestamp);

Before comparing the Dates object, try setting both of their milliseconds to zero like Date.setMilliseconds(0);.
In some cases where the Date object is dynamically created in javascript, if you keep printing the Date.getTime(), you'll see the milliseconds changing, which will prevent the equality of both dates.

Let's suppose that you deal with this 2014[:-/.]06[:-/.]06 or this 06[:-/.]06[:-/.]2014 date format, then you may compare dates this way
var a = '2014.06/07', b = '2014-06.07', c = '07-06/2014', d = '07/06.2014';
parseInt(a.replace(/[:\s\/\.-]/g, '')) == parseInt(b.replace(/[:\s\/\.-]/g, '')); // true
parseInt(c.replace(/[:\s\/\.-]/g, '')) == parseInt(d.replace(/[:\s\/\.-]/g, '')); // true
parseInt(a.replace(/[:\s\/\.-]/g, '')) < parseInt(b.replace(/[:\s\/\.-]/g, '')); // false
parseInt(c.replace(/[:\s\/\.-]/g, '')) > parseInt(d.replace(/[:\s\/\.-]/g, '')); // false
As you can see, we strip separator(s) and then compare integers.

My simple answer for this question
checkDisabled(date) {
const today = new Date()
const newDate = new Date(date._d)
if (today.getTime() > newDate.getTime()) {
return true
}
return false
}

If both of your dates come in the format "YYYY-MM-DD", you can skip the Date object and compare strings directly.
This works because of how the strings are compared in JS
let date1 = '2022-12-13';
let date2 = '2022-02-13';
console.log(`${date1} > ${date2}`, date1 > date2);
console.log(`${date1} < ${date2}`, date1 < date2);
console.log(`${date1} == ${date2}`, date1 == date2);

ISO date comparison in native javascript

i have muddling with date comparison in native javascript or jquery, can anybody point me out how i can quickly do the comparison with today's date in ISO-8601 format

Try This
var d1 = new Date('2013-08-02T10:09:08Z'), // 10:09 to
d2 = new Date('2013-08-02T10:20:08Z'); // 10:20 is 11 mins
//Get the difference
var diff = d2 - d1;
//Format this as desired.
if (diff > 60e3) console.log(
Math.floor(diff / 60e3), 'minutes ago'
);
else console.log(
Math.floor(diff / 1e3), 'seconds ago'
);
// 11 minutes ago
OR
alert((dateFromISO8601("2013-08-02T10:20:08Z") - dateFromISO8601("2013-08-02T10:09:08Z")) / 60000); //Response in Milisecnds so Divide by 60000 For Minutes
function dateFromISO8601(isostr) {
var parts = isostr.match(/\d+/g);
return new Date(parts[0], parts[1] - 1, parts[2], parts[3], parts[4], parts[5]);
}

You can just do string comparison on two valid ISO8601 strings (i.e. new Date().toISOString()) and it'll work
"2021-07-02T21:50:01.926Z" > "2021-07-04T21:49:56.863Z" // false

You can compare two dates by using new Date() method in javascript. Here's is the code to compare two dates.
var date1 = "28/08/2008";
var date2 = "12/02/2014";
if(new Date(date1) > new Date(date2)){
alert("Date 1 is greater then Date 2");
}else{
alert("Date 2 is greater than Date 1");
}

Don't use the Date constructor to parse strings as the result is inconsistent across browsers. Manually parse the strings.
If you have an ISO 8601 format like 2014-08-05T01:28:48.909Z it's very easy to parse:
// Given an ISO 8601 string, return a date object
function parseISO(s) {
s = s.split(/\D/);
return new Date(Date.UTC(s[0],--s[1],s[2],s[3],s[4],s[5],s[6]));
}
Now you can compare the dates like:
var d0 = '2014-02-06T23:45:15.987Z';
var d1 = '2014-02-06T23:48:15.987Z';
if (parseISO(d0) < parseISO(d1)) {
// d0 is before d1
}

Insert code based on date

Ok, I understand the basics of this, but I'm trying to set up a snippet of code that would allow me to insert HTML using jQuery's '.html' or '.append' function.
I've managed this alone, but I have to insert the code based on the seasons - a little more explanation here: I need to have a certain section of code included during the summer, one for winter, spring and so on.
Now, I know how to get the current date and I know how to use IF statements but I keep getting stuck on the format of the date that would allow me to compare it to set dates for the seasons and then have the function run for each one.
In case someone needs them here are some examples, not accurate ones of course:
Winter: January to March
Spring: March to June
Summer: June to November
Autumn: November to January
If someone could give me an example of this I would be very grateful. (I also couldn't figure out how to add more specific dates for the start and end of the seasons due to the fact some months have fewer/more days .... and also for events such as Christmas and Halloween)

var date = new Date(),
month = date.getMonth(),
date = date.getDate()m
season;
if(month <= 2 && date <= 20) { // Up to 20th March
season = "Winter";
} else if(month <= 5 && date <= 5) { // Up to 5th June
season = "Spring";
} // etc
$("#myDiv").html("It is " + season);
Updated with date example

Don't use string dates, use the Date object. It can tell you the current month which allows you to:
var month = new Date().getMonth();
if(month >= 0 && month <= 2) { // Jan ... March
} ...
Note that months start with 0 (== January) to 11 (== December)

Here's another option, a lot more complicated, but you can set the dates as requested, and check what season it.
var getSeason = function() {
var self = this;
return function(date, o) {
if (date == 'getDefaults') return self.defaults;
if (date == 'setDefaults') self.defaults = $.extend(self.defaults, o);
date = typeof date == 'string' ? new Date(date) : date;
var year = date.getFullYear(),
arr = $.map(self.defaults, function(d, key) {
var dt = new Date(year, d.slice(0,2)-1, d.slice(3,5), 0,0,0,0);
dt.setDate(dt.getDate()-1); // subtract one to get the startdate right
return {season : key, start_date : dt};
}).sort(function(a, b) {
return a.start_date.getTime() > b.start_date.getTime() ? 1 : -1;
}),
season = arr[arr.length-1].season;
$.each(arr, function(idx, itm) {
if (date > itm.start_date && arr[idx+1] != undefined && date < arr[idx+1].start_date) {
season = itm.season;
return false;
}
});
return season;
}
}
getSeason.prototype.defaults = { // start dates, (month/date)
spring : '03/01',
summer : '05/20',
fall : '08/04',
winter : '10/10'
}
You initialize a new season checker with new, like this :
var seasonChecker = new getSeason;
and then use it to check the season, you can pass a valid string or a date object :
seasonChecker( '03/20/14' ); // returns "spring"
seasonChecker( '03-20-14' ); // returns "spring"
seasonChecker( new Date('Thu Mar 20 2014 00:00:00') ); // returns "spring"
seasonChecker( new Date(1395270000000) ); // returns "spring"
You can get the default dates with :
seasonChecker('getDefaults');
or set the default dates for an instance at any time with :
seasonChecker('setDefaults', {
spring : '02/21',
summer : '03/22',
fall : '06/04',
winter : '11/01'
});
Here's a demonstration
FIDDLE

Calculate the difference between 2 SQLite datetimes in Javascript

I'm have a startDate and a endDate stored in a SQLite database and need to calculate the difference in minutes and seconds between the 2 datetimes using javascript.
For example:
startDate = 2012-10-07 11:01:13
endDate = 2012-10-07 12:42:13
I've had a good read though loads of similar questions on SO but could only find things relating to calculating this as part of a select.

Convert the strings to a JS Date Object, subtract the dates, and use some aritmethic to calculate hours/seconds from the result. Something like:
function convertMS(ms) {
var d, h, m, s, ts, tm, th;
s = ts = Math.floor(ms / 1000);
m = tm = Math.floor(s / 60);
s = s % 60;
h = th = Math.floor(m / 60);
m = m % 60;
d = Math.floor(h / 24);
h = h % 24;
return { d: d, h: h, m: m, s: s, tm: tm, th: th, ts: ts};
};
var start = new Date('2012-10-07 11:01:13'.split('-').join('/'))
,end = new Date('2012-10-07 12:42:13'.split('-').join('/'))
,dif = convertMS(end - start);
console.log(dif.h+':'+dif.m);​​​​​​ //=> ​1:41
console.log('total minutes dif: '+dif.tm);​​​​​​ //=> total ​minutes dif: 101
console.log('total seconds dif: '+dif.ts);​​​​​​ //=> ​total seconds dif: 6060
[edit based on comment]
'Manual' parsing of a date string in the provided format:
Date.tryParse = function(ds){
var arr = ds.match(/\d+/g)
,err = 'Expected at least yyyy'
,dat = arr.length && String(arr[0]).length === 4
? doParse.apply(null,arr) : err;
return dat;
function doParse(y,m,d,h,mi,s,ms){
var dat = new Date(+y,(+m-1)||0,+d||1,+h||0,+mi||0,+s||0,+ms||0);
return isNaN(dat) ? new Date : dat;
}
}
var start = Date.tryParse('2012-10-07 11:01:13'); //=> Sun Oct 07 2012 11:01:13
var test = Date.tryParse('2009'); //=> Sun Jan 01 2009 00:00:00

All the answers are generally correct with respect to converting the dates to milliseconds in epoch time, subtracting those, and converting the result back from milliseconds into your required units (although the specific implementations offered elsewhere do not currently give you exactly what you asked for -- i.e., just the number of minutes and seconds between your two datetimes).
However, please also note...
new Date('2012-10-07 12:42:13')
... that this is not a reliable way to construct the Date from your SQLite date strings.
When you feed a string into the constructor of a Date object, you are effectively calling Date.parse(). That behaves differently on different browsers.
Check this out:
> new Date('1-1-2012');
Sun Jan 01 2012 00:00:00 GMT-0800 (PST)
> new Date('01-01-2012');
Sun Jan 01 2012 00:00:00 GMT-0800 (PST)
> new Date('2012-1-1');
Sun Jan 01 2012 00:00:00 GMT-0800 (PST)
Looks pretty good, right? But that's on Chrome.
Now check out what happens in an up-to-date version of Firefox, with the exact same calls:
> new Date('1-1-2012');
Date {Invalid Date}
> new Date('01-01-2012');
Date {Invalid Date}
> new Date('2012-1-1');
Date {Invalid Date}
> new Date('2012-01-01');
Date {Sat Dec 31 2011 16:00:00 GMT-0800 (PST)}
Furthermore, look at this behavior, in both browsers:
> new Date('2012-01-01');
Sat Dec 31 2011 16:00:00 GMT-0800 (PST)
Simply prepending zeroes to the month and date digits causes a time warp! You have to set the time and a timezone (for me, PST) to make that go away:
> new Date('2012-01-01T00:00:00-08:00')
Sun Jan 01 2012 00:00:00 GMT-0800 (PST)
Basically, dealing with date string parsing is a headache. You don't want to have to digest and account for specs like this, this, and this.
So, here's a better alternative -- pass the parts of your datetime as separate args to the constructor of the Date object. That will reliably create the date for you, so your subsequent comparisons are valid.
new Date(year, month, day [, hour, minute, second, millisecond])
Here's what that initialization could look like for your case:
// Extract month, day, year from SQLite format, 'trimming' whitespace.
var sqlLiteSampleStr = "2012-10-07 11:01:13";
var re = /^\s*(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})\s*$/;
var match = re.exec(sqlLiteSampleStr);
if (match) {
var year = parseInt(match[1]);
var month = parseInt(match[2]) - 1; // Zero-indexed months.
var date = parseInt(match[3]);
var hour = parseInt(match[4]);
var minute = parseInt(match[5]);
var second = parseInt(match[6]);
var date = new Date(year, month, date, hour, minute, second);
}
Note: be careful of timezone considerations. You don't seem to have any timezone data in that SQLite format snippet.
Update
#james-j clarified that he's looking for minutes and seconds specifically.
Here's a snippet to extract just minutes and seconds:
var msPerMin = 1000 * 60;
var min = Math.floor(timeInMs / msPerMin);
var timeInMs = timeInMs - (min * msPerMin);
var sec = Math.floor(timeInMs / 1000 );

Other answers are correct, however browsers do not consistently parse date strings (see below) so you should manually parse the strings. The format in the OP is not consistent with the format in ES5 either, and will not be correctly parsed by some browsers. A simple function to convert the OP format to a date that will work in all browsers is:
function stringToDate(s) {
s = s.split(/[-\/\. :]/);
return new Date(s[0], --s[1], s[2], s[3], s[4], s[5], 0)
}
There are some formats that are parsed by all browsers, however they are not standards compliant and if used, are dependent on all implementations continuing to support unspecified formats.
Edit
To tolerate malformed input (extra whitespace, different seperators, extra characters), match can be used instead of split:
function stringToDate(s) {
s = s.match(/\d+/g);
return new Date(s[0], --s[1], s[2], s[3], s[4], s[5], 0)
}
However, since the values are coming from a database and a format has been specified, the date strings should fit the format. Erroneous data should not be stored in the first place.
For completeness, here's a function to do what you want:
/* Return difference between two dates as minutes and seconds mm:ss.
* Input format is yyyy-mm-dd hh:mm:ss
* If strings don't converted to dates (incorrect format or invalid values),
* return undefined.
*/
function diffInMins(s0, s1) {
var diff;
// Convert strings to date ojbects
var d0 = stringToDate(s0);
var d1 = stringToDate(s1);
// Helper function to padd with leading zero
function z(n) {
return (n<10? '0' : '') + n;
}
// Check conversions
if (d0 && d1 && typeof d0 == 'object' && typeof d1 == 'object') {
// Return difference formatted as mm:ss
if (d0 && d1) {
diff = d1 - d0;
return z(diff/60000 | 0) + ':' + z(Math.round(diff%60000/1000));
}
}
}

JavaScript actually makes subtracting dates quite simple. Here's how it works:
// Create Date objects from the strings
startDate = new Date('2012-10-07 11:01:13');
endDate = new Date('2012-10-07 12:42:13');
// Subtract Date objects to return milliseconds between them
millisecondsBetween = (endDate - startDate);
// Convert to whatever you like
alert(millisecondsBetween/1000/60 + ' minutes');

Compare two dates with JavaScript

Can someone suggest a way to compare the values of two dates greater than, less than, and not in the past using JavaScript? The values will be coming from text boxes.

The Date object will do what you want - construct one for each date, then compare them using the >, <, <= or >=.
The ==, !=, ===, and !== operators require you to use date.getTime() as in
var d1 = new Date();
var d2 = new Date(d1);
var same = d1.getTime() === d2.getTime();
var notSame = d1.getTime() !== d2.getTime();
to be clear just checking for equality directly with the date objects won't work
var d1 = new Date();
var d2 = new Date(d1);
console.log(d1 == d2); // prints false (wrong!)
console.log(d1 === d2); // prints false (wrong!)
console.log(d1 != d2); // prints true (wrong!)
console.log(d1 !== d2); // prints true (wrong!)
console.log(d1.getTime() === d2.getTime()); // prints true (correct)
I suggest you use drop-downs or some similar constrained form of date entry rather than text boxes, though, lest you find yourself in input validation hell.
For the curious, date.getTime() documentation:
Returns the numeric value of the specified date as the number of milliseconds since January 1, 1970, 00:00:00 UTC. (Negative values are returned for prior times.)

Compare < and > just as usual, but anything involving == or === should use a + prefix. Like so:
const x = new Date('2013-05-23');
const y = new Date('2013-05-23');
// less than, greater than is fine:
console.log('x < y', x < y); // false
console.log('x > y', x > y); // false
console.log('x <= y', x <= y); // true
console.log('x >= y', x >= y); // true
console.log('x === y', x === y); // false, oops!
// anything involving '==' or '===' should use the '+' prefix
// it will then compare the dates' millisecond values
console.log('+x === +y', +x === +y); // true

The easiest way to compare dates in javascript is to first convert it to a Date object and then compare these date-objects.
Below you find an object with three functions:
dates.compare(a,b)
Returns a number:
-1 if a < b
0 if a = b
1 if a > b
NaN if a or b is an illegal date
dates.inRange (d,start,end)
Returns a boolean or NaN:
true if d is between the start and end (inclusive)
false if d is before start or after end.
NaN if one or more of the dates are illegal.
dates.convert
Used by the other functions to convert their input to a date object. The input can be
a date-object : The input is returned as is.
an array: Interpreted as [year,month,day]. NOTE month is 0-11.
a number : Interpreted as number of milliseconds since 1 Jan 1970 (a timestamp)
a string : Several different formats is supported, like "YYYY/MM/DD", "MM/DD/YYYY", "Jan 31 2009" etc.
an object: Interpreted as an object with year, month and date attributes. NOTE month is 0-11.
.
// Source: http://stackoverflow.com/questions/497790
var dates = {
convert:function(d) {
// Converts the date in d to a date-object. The input can be:
// a date object: returned without modification
// an array : Interpreted as [year,month,day]. NOTE: month is 0-11.
// a number : Interpreted as number of milliseconds
// since 1 Jan 1970 (a timestamp)
// a string : Any format supported by the javascript engine, like
// "YYYY/MM/DD", "MM/DD/YYYY", "Jan 31 2009" etc.
// an object : Interpreted as an object with year, month and date
// attributes. **NOTE** month is 0-11.
return (
d.constructor === Date ? d :
d.constructor === Array ? new Date(d[0],d[1],d[2]) :
d.constructor === Number ? new Date(d) :
d.constructor === String ? new Date(d) :
typeof d === "object" ? new Date(d.year,d.month,d.date) :
NaN
);
},
compare:function(a,b) {
// Compare two dates (could be of any type supported by the convert
// function above) and returns:
// -1 : if a < b
// 0 : if a = b
// 1 : if a > b
// NaN : if a or b is an illegal date
// NOTE: The code inside isFinite does an assignment (=).
return (
isFinite(a=this.convert(a).valueOf()) &&
isFinite(b=this.convert(b).valueOf()) ?
(a>b)-(a<b) :
NaN
);
},
inRange:function(d,start,end) {
// Checks if date in d is between dates in start and end.
// Returns a boolean or NaN:
// true : if d is between start and end (inclusive)
// false : if d is before start or after end
// NaN : if one or more of the dates is illegal.
// NOTE: The code inside isFinite does an assignment (=).
return (
isFinite(d=this.convert(d).valueOf()) &&
isFinite(start=this.convert(start).valueOf()) &&
isFinite(end=this.convert(end).valueOf()) ?
start <= d && d <= end :
NaN
);
}
}

The relational operators < <= > >= can be used to compare JavaScript dates:
var d1 = new Date(2013, 0, 1);
var d2 = new Date(2013, 0, 2);
d1 < d2; // true
d1 <= d2; // true
d1 > d2; // false
d1 >= d2; // false
However, the equality operators == != === !== cannot be used to compare (the value of) dates because:
Two distinct objects are never equal for either strict or abstract comparisons.
An expression comparing Objects is only true if the operands reference the same Object.
You can compare the value of dates for equality using any of these methods:
var d1 = new Date(2013, 0, 1);
var d2 = new Date(2013, 0, 1);
/*
* note: d1 == d2 returns false as described above
*/
d1.getTime() == d2.getTime(); // true
d1.valueOf() == d2.valueOf(); // true
Number(d1) == Number(d2); // true
+d1 == +d2; // true
Both Date.getTime() and Date.valueOf() return the number of milliseconds since January 1, 1970, 00:00 UTC. Both Number function and unary + operator call the valueOf() methods behind the scenes.

By far the easiest method is to subtract one date from the other and compare the result.
var oDateOne = new Date();
var oDateTwo = new Date();
console.log(oDateOne - oDateTwo === 0);
console.log(oDateOne - oDateTwo < 0);
console.log(oDateOne - oDateTwo > 0);

Comparing dates in JavaScript is quite easy... JavaScript has built-in comparison system for dates which makes it so easy to do the comparison...
Just follow these steps for comparing 2 dates value, for example you have 2 inputs which each has a Date value in String and you to compare them...
1. you have 2 string values you get from an input and you'd like to compare them, they are as below:
var date1 = '01/12/2018';
var date2 = '12/12/2018';
2. They need to be Date Object to be compared as date values, so simply convert them to date, using new Date(), I just re-assign them for simplicity of explanation, but you can do it anyway you like:
date1 = new Date(date1);
date2 = new Date(date2);
3. Now simply compare them, using the > < >= <=
date1 > date2; //false
date1 < date2; //true
date1 >= date2; //false
date1 <= date2; //true

Compare day only (ignoring time component):
Date.prototype.sameDay = function(d) {
return this.getFullYear() === d.getFullYear()
&& this.getDate() === d.getDate()
&& this.getMonth() === d.getMonth();
}
Usage:
if(date1.sameDay(date2)) {
// highlight day on calendar or something else clever
}
I no longer recommend modifying the prototype of built-in objects. Try this instead:
function isSameDay(d1, d2) {
return d1.getFullYear() === d2.getFullYear() &&
d1.getDate() === d2.getDate() &&
d1.getMonth() === d2.getMonth();
}
console.log(isSameDay(new Date('Jan 15 2021 02:39:53 GMT-0800'), new Date('Jan 15 2021 23:39:53 GMT-0800')));
console.log(isSameDay(new Date('Jan 15 2021 10:39:53 GMT-0800'), new Date('Jan 16 2021 10:39:53 GMT-0800')));
N.B. the year/month/day will be returned for your timezone; I recommend using a timezone-aware library if you want to check if two dates are on the same day in a different timezone.
e.g.
> (new Date('Jan 15 2021 01:39:53 Z')).getDate() // Jan 15 in UTC
14 // Returns "14" because I'm in GMT-08

what format?
If you construct a Javascript Date object, you can just subtract them to get a milliseconds difference (edit: or just compare them) :
js>t1 = new Date()
Thu Jan 29 2009 14:19:28 GMT-0500 (Eastern Standard Time)
js>t2 = new Date()
Thu Jan 29 2009 14:19:31 GMT-0500 (Eastern Standard Time)
js>t2-t1
2672
js>t3 = new Date('2009 Jan 1')
Thu Jan 01 2009 00:00:00 GMT-0500 (Eastern Standard Time)
js>t1-t3
2470768442
js>t1>t3
true

Note - Compare Only Date Part:
When we compare two date in javascript. It takes hours, minutes and seconds also into consideration.. So If we only need to compare date only, this is the approach:
var date1= new Date("01/01/2014").setHours(0,0,0,0);
var date2= new Date("01/01/2014").setHours(0,0,0,0);
Now: if date1.valueOf()> date2.valueOf() will work like a charm.

The simple way is,
var first = '2012-11-21';
var second = '2012-11-03';
if (new Date(first) > new Date(second) {
.....
}

SHORT ANSWER
Here is a function that return {boolean} if the from dateTime > to dateTime Demo in action
var from = '08/19/2013 00:00'
var to = '08/12/2013 00:00 '
function isFromBiggerThanTo(dtmfrom, dtmto){
return new Date(dtmfrom).getTime() >= new Date(dtmto).getTime() ;
}
console.log(isFromBiggerThanTo(from, to)); //true
Explanation
jsFiddle
var date_one = '2013-07-29 01:50:00',
date_two = '2013-07-29 02:50:00';
//getTime() returns the number of milliseconds since 01.01.1970.
var timeStamp_date_one = new Date(date_one).getTime() ; //1375077000000
console.log(typeof timeStamp_date_one);//number
var timeStamp_date_two = new Date(date_two).getTime() ;//1375080600000
console.log(typeof timeStamp_date_two);//number
since you are now having both datetime in number type
you can compare them with any Comparison operations
( >, < ,= ,!= ,== ,!== ,>= AND <=)
Then
if you are familiar with C# Custom Date and Time Format String this library should do the exact same thing and help you format your date and time dtmFRM whether you are passing in date time string or unix format
Usage
var myDateTime = new dtmFRM();
alert(myDateTime.ToString(1375077000000, "MM/dd/yyyy hh:mm:ss ampm"));
//07/29/2013 01:50:00 AM
alert(myDateTime.ToString(1375077000000,"the year is yyyy and the day is dddd"));
//this year is 2013 and the day is Monday
alert(myDateTime.ToString('1/21/2014', "this month is MMMM and the day is dd"));
//this month is january and the day is 21
DEMO
all you have to do is passing any of these format pacified in the library js file

You can use this code:
var firstValue = "2012-05-12".split('-');
var secondValue = "2014-07-12".split('-');
var firstDate=new Date();
firstDate.setFullYear(firstValue[0],(firstValue[1] - 1 ),firstValue[2]);
var secondDate=new Date();
secondDate.setFullYear(secondValue[0],(secondValue[1] - 1 ),secondValue[2]);
if (firstDate > secondDate)
{
alert("First Date is greater than Second Date");
}
else
{
alert("Second Date is greater than First Date");
}
And also check the MDN article for the Date class.

function datesEqual(a, b)
{
return (!(a>b || b>a))
}

var date = new Date(); // will give you todays date.
// following calls, will let you set new dates.
setDate()
setFullYear()
setHours()
setMilliseconds()
setMinutes()
setMonth()
setSeconds()
setTime()
var yesterday = new Date();
yesterday.setDate(...date info here);
if(date>yesterday) // will compare dates

BEWARE THE TIMEZONE
A javascript date has no notion of timezone. It's a moment in time (ticks since the epoch) with handy functions for translating to and from strings in the "local" timezone. If you want to work with dates using date objects, as everyone here is doing, you want your dates to represent UTC midnight at the start of the date in question. This is a common and necessary convention that lets you work with dates regardless of the season or timezone of their creation. So you need to be very vigilant to manage the notion of timezone, particularly when you create your midnight UTC Date object.
Most of the time, you will want your date to reflect the timezone of the user. Click if today is your birthday. Users in NZ and US click at the same time and get different dates. In that case, do this...
// create a date (utc midnight) reflecting the value of myDate and the environment's timezone offset.
new Date(Date.UTC(myDate.getFullYear(),myDate.getMonth(), myDate.getDate()));
Sometimes, international comparability trumps local accuracy. In that case, do this...
// the date in London of a moment in time. Device timezone is ignored.
new Date(Date.UTC(myDate.getUTCYear(), myDate.getyUTCMonth(), myDate.getUTCDate()));
Now you can directly compare your date objects as the other answers suggest.
Having taken care to manage timezone when you create, you also need to be sure to keep timezone out when you convert back to a string representation. So you can safely use...
toISOString()
getUTCxxx()
getTime() //returns a number with no time or timezone.
.toLocaleDateString("fr",{timezone:"UTC"}) // whatever locale you want, but ALWAYS UTC.
And totally avoid everything else, especially...
getYear(),getMonth(),getDate()

Via Moment.js
Jsfiddle: http://jsfiddle.net/guhokemk/1/
function compare(dateTimeA, dateTimeB) {
var momentA = moment(dateTimeA,"DD/MM/YYYY");
var momentB = moment(dateTimeB,"DD/MM/YYYY");
if (momentA > momentB) return 1;
else if (momentA < momentB) return -1;
else return 0;
}
alert(compare("11/07/2015", "10/07/2015"));
The method returns 1 if dateTimeA is greater than dateTimeB
The method returns 0 if dateTimeA equals dateTimeB
The method returns -1 if dateTimeA is less than dateTimeB

Just to add yet another possibility to the many existing options, you could try:
if (date1.valueOf()==date2.valueOf()) .....
...which seems to work for me. Of course you do have to ensure that both dates are not undefined...
if ((date1?date1.valueOf():0)==(date2?date2.valueOf():0) .....
This way we can ensure that a positive comparison is made if both are undefined also, or...
if ((date1?date1.valueOf():0)==(date2?date2.valueOf():-1) .....
...if you prefer them not to be equal.

If following is your date format, you can use this code:
var first = '2012-11-21';
var second = '2012-11-03';
if(parseInt(first.replace(/-/g,""),10) > parseInt(second.replace(/-/g,""),10)){
//...
}
It will check whether 20121121 number is bigger than 20121103 or not.

Subtract two date get the difference in millisecond, if you get 0 it's the same date
function areSameDate(d1, d2){
return d1 - d2 === 0
}

Say you got the date objects A and B, get their EPOC time value, then subtract to get the difference in milliseconds.
var diff = +A - +B;
That's all.

One way to compare two dates is to use the dates.js library.
The Date.compare(Date date1, Date date2) method that returns a number which means the one of following result:
-1 = date1 is less than date2.
0 = values are equal.
1 = date1 is greater than date2.

Performance
Today 2020.02.27 I perform tests of chosen solutions on Chrome v80.0, Safari v13.0.5 and Firefox 73.0.1 on MacOs High Sierra v10.13.6
Conclusions
solutions d1==d2 (D) and d1===d2 (E) are fastest for all browsers
solution getTime (A) is faster than valueOf (B) (both are medium fast)
solutions F,L,N are slowest for all browsers
Details
In below snippet solutions used in performance tests are presented. You can perform test in you machine HERE
function A(d1,d2) {
return d1.getTime() == d2.getTime();
}
function B(d1,d2) {
return d1.valueOf() == d2.valueOf();
}
function C(d1,d2) {
return Number(d1) == Number(d2);
}
function D(d1,d2) {
return d1 == d2;
}
function E(d1,d2) {
return d1 === d2;
}
function F(d1,d2) {
return (!(d1>d2 || d2>d1));
}
function G(d1,d2) {
return d1*1 == d2*1;
}
function H(d1,d2) {
return +d1 == +d2;
}
function I(d1,d2) {
return !(+d1 - +d2);
}
function J(d1,d2) {
return !(d1 - d2);
}
function K(d1,d2) {
return d1 - d2 == 0;
}
function L(d1,d2) {
return !((d1>d2)-(d1<d2));
}
function M(d1,d2) {
return d1.getFullYear() === d2.getFullYear()
&& d1.getDate() === d2.getDate()
&& d1.getMonth() === d2.getMonth();
}
function N(d1,d2) {
return (isFinite(d1.valueOf()) && isFinite(d2.valueOf()) ? !((d1>d2)-(d1<d2)) : false );
}
// TEST
let past= new Date('2002-12-24'); // past
let now= new Date('2020-02-26'); // now
console.log('Code d1>d2 d1<d2 d1=d2')
var log = (l,f) => console.log(`${l} ${f(now,past)} ${f(past,now)} ${f(now,now)}`);
log('A',A);
log('B',B);
log('C',C);
log('D',D);
log('E',E);
log('G',G);
log('H',H);
log('I',I);
log('J',J);
log('K',K);
log('L',L);
log('M',M);
log('N',N);
p {color: red}
<p>This snippet only presents tested solutions (it not perform tests itself)</p>
Results for chrome

In order to create dates from free text in JavaScript you need to parse it into the Date object.
You could use Date.parse() which takes free text and tries to convert it into a new date but if you have control over the page I would recommend using HTML select boxes instead or a date picker such as the YUI calendar control or the jQuery UI Datepicker.
Once you have a date, as other people have pointed out, you can use simple arithmetic to subtract the dates and convert it back into a number of days by dividing the number (in seconds) by the number of seconds in a day (60*60*24 = 86400).

var date_today=new Date();
var formated_date = formatDate(date_today);//Calling formatDate Function
var input_date="2015/04/22 11:12 AM";
var currentDateTime = new Date(Date.parse(formated_date));
var inputDateTime = new Date(Date.parse(input_date));
if (inputDateTime <= currentDateTime){
//Do something...
}
function formatDate(date) {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? 'PM' : 'AM';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
hours = hours < 10 ? '0'+hours : hours ;
minutes = minutes < 10 ? '0'+minutes : minutes;
var strTime = hours+":"+minutes+ ' ' + ampm;
return date.getFullYear()+ "/" + ((date.getMonth()+1) < 10 ? "0"+(date.getMonth()+1) :
(date.getMonth()+1) ) + "/" + (date.getDate() < 10 ? "0"+date.getDate() :
date.getDate()) + " " + strTime;
}

An Improved version of the code posted by "some"
/* Compare the current date against another date.
*
* #param b {Date} the other date
* #returns -1 : if this < b
* 0 : if this === b
* 1 : if this > b
* NaN : if a or b is an illegal date
*/
Date.prototype.compare = function(b) {
if (b.constructor !== Date) {
throw "invalid_date";
}
return (isFinite(this.valueOf()) && isFinite(b.valueOf()) ?
(this>b)-(this<b) : NaN
);
};
usage:
var a = new Date(2011, 1-1, 1);
var b = new Date(2011, 1-1, 1);
var c = new Date(2011, 1-1, 31);
var d = new Date(2011, 1-1, 31);
assertEquals( 0, a.compare(b));
assertEquals( 0, b.compare(a));
assertEquals(-1, a.compare(c));
assertEquals( 1, c.compare(a));

I usually store Dates as timestamps(Number) in databases.
When I need to compare, I simply compare among those timestamps or
convert it to Date Object and then compare with > <if necessary.
Note that == or === does not work properly unless your variables are references of the same Date Object.
Convert those Date objects to timestamp(number) first and then compare equality of them.
Date to Timestamp
var timestamp_1970 = new Date(0).getTime(); // 1970-01-01 00:00:00
var timestamp = new Date().getTime(); // Current Timestamp
Timestamp to Date
var timestamp = 0; // 1970-01-01 00:00:00
var DateObject = new Date(timestamp);

Before comparing the Dates object, try setting both of their milliseconds to zero like Date.setMilliseconds(0);.
In some cases where the Date object is dynamically created in javascript, if you keep printing the Date.getTime(), you'll see the milliseconds changing, which will prevent the equality of both dates.

Let's suppose that you deal with this 2014[:-/.]06[:-/.]06 or this 06[:-/.]06[:-/.]2014 date format, then you may compare dates this way
var a = '2014.06/07', b = '2014-06.07', c = '07-06/2014', d = '07/06.2014';
parseInt(a.replace(/[:\s\/\.-]/g, '')) == parseInt(b.replace(/[:\s\/\.-]/g, '')); // true
parseInt(c.replace(/[:\s\/\.-]/g, '')) == parseInt(d.replace(/[:\s\/\.-]/g, '')); // true
parseInt(a.replace(/[:\s\/\.-]/g, '')) < parseInt(b.replace(/[:\s\/\.-]/g, '')); // false
parseInt(c.replace(/[:\s\/\.-]/g, '')) > parseInt(d.replace(/[:\s\/\.-]/g, '')); // false
As you can see, we strip separator(s) and then compare integers.

My simple answer for this question
checkDisabled(date) {
const today = new Date()
const newDate = new Date(date._d)
if (today.getTime() > newDate.getTime()) {
return true
}
return false
}

If both of your dates come in the format "YYYY-MM-DD", you can skip the Date object and compare strings directly.
This works because of how the strings are compared in JS
let date1 = '2022-12-13';
let date2 = '2022-02-13';
console.log(`${date1} > ${date2}`, date1 > date2);
console.log(`${date1} < ${date2}`, date1 < date2);
console.log(`${date1} == ${date2}`, date1 == date2);