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Can I use comparison and logical operators for time inputs in Javascript? [duplicate]

I'm trying to write a statement that says "if time is this and less than that then". I can use get hours and get min. However, I'm having problems combining a time such as 9:30.
Example,
var now = new Date();
var hour = now.getHours();
var day = now.getDay();
var mintues = now.getMinutes();
if (day == 0 && hour >= 9 && hour <= 11 && mintues >= 30) {
document.write(now);
}
This only if the time is less between 9:30 10. As soon as the clock hits 10 the minutes are then < 30 and the script breaks.
Any thoughts on how to better incorporate the time function to make this theory work?
Thanks,

use new Date().getTime() returns milliseconds for much easier comparison. This way there is no need to check hour, min, second, millisecond. Fiddle link
var d930 = new Date(2010, 12, 21, 9, 30, 0, 0), // today 9:30:00:000
d931 = new Date(2010, 12, 21, 9, 31, 0, 0), // today 9:31:00:000
t930 = d930.getTime(),
t931 = d931.getTime();
console.log(t931 > t930);
This way your code can check against a static 9:30 time.
var time930 = new Date(2010, 12, 21, 9, 30, 0, 0).getTime(),
sunday = 0,
now = new Date();
if(now.getDay() == sunday && now.getTime() >= time930){
/* do stuff */
}

You have a few typos and basic javascript errors.
Might wanna brush up on the basics.
W3Schools is where I learned all I know.
It works fine if you fix them...
var now = new Date();
var hour = now.getHours();
var day = now.getDay();
var minutes = now.getMinutes();
if(day == 0 && hour == 9 && minutes < 30 && minutes > 10 || day == 0 && hour == 9)
document.write('Time is between 9:10 and 9:30');
Think of the if statement as basic logic.
If the day is Sunday(0)
AND the hour is 9
AND the minutes are greater than 10
AND the minutes are less than 10
OR the day is Sunday(0)
AND the hour is before 9.

var now = new Date();
var closeTime = new Date();
closeTime.setHours(9); closeTime.setMinutes(30);
console.log(now, closeTime, now.getTime() >= closeTime.getTime());
close time is based on today, then we just change the hours and minutes to 9:30.

I made this solution simple and easy to read (thus easy to adjust).
// we need a function that makes hours and minutes a two digit number
Object.prototype.twoDigits = function () {
return ("0" + this).slice(-2);
}
// get current date and time
let now = new Date();
// compile the current hour and minutes in the format 09:35
timeOfDay = now.getHours().twoDigits() + ':' + now.getMinutes().twoDigits();
// test if timeOfDay is within a given time frame
if ('09:30' <= timeOfDay && timeOfDay <= '11:30') {
console.log('inside time frame');
} else {
console.log('outside time frame');
}

I had a similar problem to solve today, I setup a little component that returns if a place of business is open or not. Got the time by dividing the minutes by 100 then adding it to the hours. So 8:30 is represented as 8.3
let d = new Date()
let day = d.getDay()
let hours = d.getHours()
let minutes = d.getMinutes() / 100
let time = hours + minutes
if (day == 1) {
if (time > 8.3 && time < 17.3) {
setIsOpen(true)
} else {
setIsOpen(false)
}
}

if the hour is less than 9, true
or
if hour is 9 and minutes lt 30, true
so that would look like
if ((hour < 9) || (hour == 9 && minutes < 30))
Use words to figure out your logic. Symbols are just shortcuts.

One way is to do a direct comparison on date objects. Choose an arbitrary year, month and day, and then incorporate your times as follows:
var older = new Date("1980-01-01 12:15");
var newer = new Date("1980-01-01 12:30");
if (newer > older){
alert("Newer time is newer");
} else {
alert ("The time is not newer");
}
The MDC documentation on the Date object will help with some more details. The bottom line is that if you want to compare times, you don't actually need to call any methods on the objects, and it's possible to directly compare them. The date() object can take a variety of strings to assign a new time to the returned instance, these are from the MDC documentation:
today = new Date();
birthday = new Date("December 17, 1995 03:24:00");
birthday = new Date(1995,11,17);
birthday = new Date(1995,11,17,3,24,0);
As you can see, it's pretty simple. Don't complicate, and have a look through the documentation :)
While we're here, here's a test using your example:
var base = new Date("1980-01-01 9:30");
var test = new Date("1980-01-01 9:30:01");
if (test >= base){
alert("test time is newer or equal to base time");
} else {
alert ("test time is older than 9.30");
}

Try this:
var now = new Date();
var hour = now.getHours();
var mintues = now.getMinutes();
if(
(hour*60 + mintues) > 570 &&
hour <= 11
)
{
document.write(now);
}

I don't quite fully understand your question but hope this helps.
c = new Date();
nhour = c.getHours();
nmin = c.getMinutes();
if(nmin <= 9) {
nmin = "0" + nmin;
}
if(nhour <= 9) {
nhour = "0" + nhour;
}
newtime = nhour + "" + nmin;
if(newtime <= 0930){
alert("It is before 9:30am or earlier");
}

Dynamically create/limit range for random time and convert to timestamp

I have been working on a script that dynamically creates a date/time value between two days. However I want to limit it as follows:
if appointment.status === "today": Set the range between now (start) and the end of the working day (end) i.e. today between time right now to 18:00
if appointment.status === "pending": Set the range from tomorrow (start) + 1 week (end) but keeping in mind the working day i.e. 08:00-17:00... so it can be next week Tuesday 13:00
Once done, I would like to convert var date to a timestamp.
This is my code so far:
if (appointment.status === "today") {
appointment.timestamp = (function() {
var a = randomTime(new Date("10-10-2015 10:30"), new Date("12-10-2015 02:10"));
return a
})();
} else if (appointment.status === "pending") {
appointment.timestamp = (function() {
var a = randomTime(new Date("10-10-2015 10:30"), new Date("12-10-2015 02:10"));
return a
})();
}
function randomTime(start, end) {
var diff = end.getTime() - start.getTime();
var new_diff = diff * Math.random();
var date = new Date(start.getTime() + new_diff);
return date;
}

var start = new Date();
var end = new Date();
if (appointment.status === "today") {
end.setHours(18);
end.setMinutes(0);
} else if (appointment.status === "pending") {
start.setDate(start.getDate() + 1);
end.setDate(end.getDate() + 7);
}
start = restrictTimeToWorkHours(start);
end = restrictTimeToWorkHours(end);
appointment.timestamp = Math.floor(randomTime(start, end) / 1000);
function randomTime(start, end) {
var diff = end.getTime() - start.getTime();
var new_diff = diff * Math.random();
return new Date(start.getTime() + new_diff);
}
function restrictTimeToWorkHours(date) {
if (date.getHours() < 8) {
date.setHours(8);
date.setMinutes(0);
}
if (date.getHours() > 16) {
date.setHours(16);
date.setMinutes(0);
}
return date;
}
The key thing to remember here is the Math.floor(randomTime(start, end) / 1000);. You said you wanted it in timestamp, so I take it to mean you want a Unix Timestamp. A Unix Timestasmp is in seconds, while Date.getTime() is in milliseconds, so we need to divide by 1000 to get seconds

Either look for a date library or create your own date transformation function for each operation and combine those.
endOfDay(time)
getRandomTimeBetween(startTime, endOfDay(startTime))
isWorkingDay(time)
// etc.
For the second case, you can do it in two steps: select a random day in the range, then select a random time within the working hours of that day.
Break it down to simple, logical operations, and you can test each function separately, and your code will look nice and readable.

Increase number twice a week

How would you increase a a number on a webpage twice a week on specific days and times?
For example the webpage would read:
"2 Apples"
However every Tuesday & Thursday at 9:00pm the number should increase by two.
So by Friday the number should have increased to 6 "Apples"
What's a simple way to increment this in Javascript, php or Jquery?

As it was mentionned in the comments, I advise you to use a cron to handle this.
First, you have to store your value somewhere (file, databse, ...). Then, you should create a cron job, that runs a code that increase and update your value at the given days of the week.
Some help about crons : https://en.wikipedia.org/wiki/Cron#Examples
I would add this post about cron and php : Executing a PHP script with a CRON Job
Hope it helps

Here a Javascript version, you can pass it the date it should start counting, the date you want to know the ammount of apples of, the days of the week apples will be added, the hours of the day the updat will take place and the ammount of apples that will be added on each of these dates.
Date.prototype.addDays = function (days) {
var result = new Date(this);
result.setDate(result.getDate() + days);
return result;
}
Date.prototype.addHours = function (hours) {
var result = new Date(this);
result.setHours(result.getHours() + hours);
return result;
}
function getApples(startdate, date, updateDays, updateTime, applesPerUpdate) {
var startDay = startdate.getDay();
var firstUpdateDate;
for(day of updateDays) {
if (day >= startDay) {//assumes startdate has no time added
firstUpdateDate = startdate.addDays(day - startDay).addHours(updateTime);
break;
}
}
if (!firstUpdateDate)
firstUpdateDate = startdate.addDays(7 - (startDay - updateDays[0])).addHours(updateTime);
var updateDaysReverse = updateDays.slice(0).reverse();//clones the array
var dateDay = date.getDay();
var lastUpdateDate;
for(day of updateDaysReverse) {
if (day < dateDay || day == dateDay && date.getHours() > updateTime) {
lastUpdateDate = date.addDays(day - dateDay);
break;
}
}
if (!lastUpdateDate)
lastUpdateDate = date.addDays(updateDaysReverse[0] - (7 + dateDay));
lastUpdateDate = new Date(Date.UTC(1900 + lastUpdateDate.getYear(), lastUpdateDate.getMonth(), lastUpdateDate.getDate(), updateTime, 0, 0, 0));
var secs = Math.trunc((lastUpdateDate - firstUpdateDate));
if (secs < 0) return 0;
var dayDiffs = [];
for(day of updateDays)
dayDiffs.push(day - updateDays[0]);
var weeks = Math.trunc(secs / 604800000);
var days = Math.trunc((secs % 604800000) / 86400000);
var apples = weeks * updateDays.length;
for(diff of dayDiffs)
{
if (diff <= days)
apples++;
else
break;
}
return apples * applesPerUpdate;
}
// important, day and month is zero-based
var startDate = new Date(Date.UTC(2016, 01, 07, 0, 0, 0, 0));
var updateDays = [2, 4];// 0 = sunday , have to be in order and must be 0 <= x < 7
var updateTime = 9;
console.log(getApples(startDate, new Date(), updateDays, updateTime, 2));
Was more coplicated than I thaught, and i havn't testet it much, so there may be bugs.
Here is a plunker to play with the values.

Javascript Time Comparisons

I have two issues I need to solve using javascript or jQuery.
1) I need to test whether the current time falls between 7am and 7pm.
var now = new Date();
if (now >= *7am* && now < *7pm*){} else {}
2) On document load, I need a function to run everyday at 7am and 7pm.
Any help is appreciated.
Resolved part 2 by running a time check every 15 minutes.
var checkTime = setInterval(myFunction(), 900000);

You can use var currentHour = (new Date()).getHours(); to retrieve the specific hour as an integer between 0 and 23, according to the local timezone of your environment:
var currentHour = (new Date()).getHours();
if (currentHour >= 7 && currentHour < 19) { /* stuff */ } else { /* other stuff }
If you need to get UTC, there is the .getUTCHours() method.
The documentation has more information if you're interested: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getHours

Look at Date.getHours
$(function(){
var now = new Date();
var hours = now.getHours();
if (hours >= 7 && now < hours < 19){} else {}
});

Will this JS time code work? Can I make it better?

I'm displaying a message between Saturday at 6pm and Sunday 4am. The last time I had to do this it didn't work because I didn't take into account UTC time going negative when changing it to NYC time.
I am doing the math right (displaying at the appropriate times)?Should I put the UTC conversion code into its own function? Is this the worst js you've ever seen?
-- jquery is called --
$(document).ready(function() {
var dayTime = new Date();
var day = dayTime.getUTCDay();
var hour = dayTime.getUTCHours();
//alert(day.toString()+" "+hour.toString());
if (hour >= 5){
hour = hour-5;
}
else{
hour = hour+19;
if(day > 0){
day--;
}
else{
day = 6;
}
}
//alert(day.toString()+" "+hour.toString());
if ((day == 6 && hour >= 18) || (day == 0 && hour < 4)){
}
else{
$('#warning').hide(); //Want this message to show if js is disabled as well
}
});

Why do you even need that UTC stuff? Just work with local time:
var day = dayTime.getDay();
var hour = dayTime.getHours();
And you can clean up that conditional a bit too:
if (!(day == 6 && hour >= 18) && !(day == 0 && hour < 4)) {
$('#warning').hide();
}

This should get you your server's time:
var dayTime = new Date();
localOffset = dayTime.getTimezoneOffset() * 60000;
serverOffset = 5 * 60 * 60000;
dayTime = new Date(dayTime.getTime() + (localOffset - serverOffset));
Play around with that "5" in the server offset; it's the hours. It may need to be a -5; I'm not really sure.
Also, that's going to break every daylight savings. You'll have to detect that somehow and modify serverOffset.