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React Native new Date() not working

I tried to get Date from datestring but it's not wokring properly.
var time = new Date('2017-12-26T02:12:00')
But when I called time.getHours() it returns 12.
I am not sure what I am doing wrong.

Use below code to get day, month and year.
var date = new Date(),
day = date.getDate(),
month = date.getMonth() + 1,
year = date.getFullYear(),
today = day+"-"+month+"-"+year;
You can change the format of date as per your requirement.

Adding below code fixed the problem
time.setMinutes(time.getMinutes() + time.getTimezoneOffset());
:)

Format date and Subtract days using Moment.js

I would like a variable to hold yesterday's date in the format DD-MM-YYYY using Moment.js. So if today is 15-04-2015, I would like to subtract a day and have 14-4-2015.
I've tried a few combinations like this:
startdate = moment().format('DD-MM-YYYY');
startdate.subtract(1, 'd');
and this:
startdate = moment().format('DD-MM-YYYY').subtract(1, 'd');
and also this:
startdate = moment();
startdate.subtract(1, 'd');
startdate.format('DD-MM-YYYY')
But I'm not getting it...

You have multiple oddities happening. The first has been edited in your post, but it had to do with the order that the methods were being called.
.format returns a string. String does not have a subtract method.
The second issue is that you are subtracting the day, but not actually saving that as a variable.
Your code, then, should look like:
var startdate = moment();
startdate = startdate.subtract(1, "days");
startdate = startdate.format("DD-MM-YYYY");
However, you can chain this together; this would look like:
var startdate = moment().subtract(1, "days").format("DD-MM-YYYY");
The difference is that we're setting startdate to the changes that you're doing on startdate, because moment is destructive.

var date = new Date();
var targetDate = moment(date).subtract(1, 'day').toDate(); // date object
Now, you can format how you wanna see this date or you can compare this date with another etc.
toDate() function is the point.

startdate = moment().subtract(1, 'days').format('DD-MM-YYYY');

Try this:
var duration = moment.duration({'days' : 1});
moment().subtract(duration).format('DD-MM-YYYY');
This will give you 14-04-2015 - today is 15-04-2015
Alternatively if your momentjs version is less than 2.8.0, you can use:
startdate = moment().subtract('days', 1).format('DD-MM-YYYY');
Instead of this:
startdate = moment().subtract(1, 'days').format('DD-MM-YYYY');

startdate = moment().subtract(1, 'days').startOf('day')

In angularjs moment="^1.3.0"
moment('15-01-1979', 'DD-MM-YYYY').subtract(1,'days').format(); //14-01-1979
or
moment('15-01-1979', 'DD-MM-YYYY').add(1,'days').format(); //16-01-1979
``

I think you have got it in that last attempt, you just need to grab the string.. in Chrome's console..
startdate = moment();
startdate.subtract(1, 'd');
startdate.format('DD-MM-YYYY');
"14-04-2015"
startdate = moment();
startdate.subtract(1, 'd');
myString = startdate.format('DD-MM-YYYY');
"14-04-2015"
myString
"14-04-2015"

How do I get the time in milliseconds from 2 different string?

I have the following code which I get from parameters in the URL.
This is what I have in the URL
&dateStart=15.01.2015&timeStart=08%3A00&
After getting the parameters I have the following: 15.01.2015:08:00
Using Javascript how can I parse this string to get the date in milliseconds?
Date.parse(15.01.2015:08:00)
But obviously this doesn't work.
Date.parse(15-01-2015)
This works and I can change this but then how do I add or get the milliseconds from the time??

This is quite possibly the ugliest JavaScript function I've written in my life but it should work for you.
function millisecondsFromMyDateTime(dateTime) {
var dayMonth = dateTime.split('.');
var yearHourMinute = dayMonth[2].split(':');
var year = yearHourMinute[0];
var month = parseInt(dayMonth[1]) - 1;
var day = dayMonth[0];
var hour = yearHourMinute[1];
var minute = yearHourMinute[2];
var dateTimeObj = new Date(year, month, day, hour, minute, 0, 0);
return dateTimeObj.getTime();
}
It will work with the format that your DateTime is in aka day.month.year:hours:minutes.

You can achieve it using Javascript Date Object and JavaScript getTime() Method:
var dateString="01.15.2015 08:00";
var d = new Date(dateString);
console.log(d);
var ms=d.getTime();
console.log(ms);
ms+=10000;
console.log(new Date(ms));
Here is a DEMO Fiddle.
Note: Change your date string from 15.01.2015:08:00 to "01.15.2015 08:00" because it's not a valid Date format.

Check for format
Date() in javascript :
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
Format allowed :
https://www.rfc-editor.org/rfc/rfc2822#page-14

You can try to use moment.js library like this:
moment('15.01.2015 08:00', 'DD.MM.YYYY HH:mm').milliseconds()

Just for the sake of completion, you can always extract the information and create a Date object from the extracted data.
var dateStart = '15.01.2015'
var timeStart = '08:00';
var year = dateStart.substring(6,10);
var month = dateStart.substring(3,5);
var day = dateStart.substring(0,2);
var hour = timeStart.substring(0,2);
var mins = timeStart.substring(3,5);
var fulldate = new Date(year, month-1, day, hour, mins);
console.log(fulldate.getTime());

Parse string in given format to date

I want to parse date in the format ddMMyyhhmm (eg 2804121530 representing 28th April 2012, 3:30 PM) to javascript Date() object.
Is there any oneliner solution to it? I'm looking for something of the kind:
var date = Date.parse('2804121530', 'ddMMyyhhmm');
or
var date = new Date('2804121530', 'ddMMyyhhmm');
Thanks for help!

A useful library here is DateJs. Just add a reference:
<script src="http://datejs.googlecode.com/files/date.js"
type="text/javascript"></script>
and use Date.parseExact:
var dateStr = '2804121530';
var date = Date.parseExact(dateStr, 'ddMMyyHHmm');

For a fast solution you can brake that string into pieces and create date from those pieces
function myDateFormat(myDate){
var day = myDate[0]+''+myDate[1];
var month = parseInt(myDate[2]+''+myDate[3], 10) - 1;
var year = '20'+myDate[4]+''+myDate[5];
var hour = myDate[6]+''+myDate[7];
var minute = myDate[8]+''+myDate[9];
return new Date(year,month,day,hour,minute,0,0);
}
var myDate = myDateFormat('2804121530');
or a simper solution:
function myDateFormat(myDate){
return new Date(('20'+myDate.slice(4,6)),(parseInt(myDate.slice(2,4), 10)-1),myDate.slice(0,2),myDate.slice(6,8),myDate.slice(8,10),0,0);
}
var myDate = myDateFormat('2804121530');

(new Date(1381344723000)).toUTCString()
Correct me if 'm worng...

Javascript get date in format [duplicate]

This question already has answers here:
How do I format a date in JavaScript?
(68 answers)
Closed 3 years ago.
I want to get today's date in the format of mm-dd-yyyy
I am using var currentDate = new Date();
document.write(currentDate);
I can't figure out how to format it.
I saw the examples var currentTime = new Date(YY, mm, dd); and currentTime.format("mm/dd/YY");
Both of which don't work
I finally got a properly formatted date using
var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()+1;//January is 0!`
var yyyy = today.getFullYear();
if(dd<10){dd='0'+dd}
if(mm<10){mm='0'+mm}
var today = mm+'/'+dd+'/'+yyyy;
document.write(today);'`
This seems very complex for such a simple task.
Is there a better way to get today's date in dd/mm/yyyy?

Unfortunately there is no better way, but instead of reinventing the wheel, you could use a library to deal with parsing and formatting dates: Datejs
<plug class="shameless">
Or, if you find format specifiers ugly and hard to decipher, here's a concise formatting implementation that allows you to use human-readable format specifiers (namely, the Date instance getters themselves):
date.format("{Month:2}-{Date:2}-{FullYear}"); // mm-dd-yyyy
</plug>

var today = new Date();
var strDate = 'Y-m-d'
.replace('Y', today.getFullYear())
.replace('m', today.getMonth()+1)
.replace('d', today.getDate());

Simple answer is no. Thats the only way to do it that I know of.
You can probably wrap into a function that you can reuse many times.

date.js is what you need. For example, snippet below is to convert a date to string as Java style
new Date().toString('M/d/yyyy')

function dateNow(splinter){
var set = new Date();
var getDate = set.getDate().toString();
if (getDate.length == 1){ //example if 1 change to 01
getDate = "0"+getDate;
}
var getMonth = (set.getMonth()+1).toString();
if (getMonth.length == 1){
getMonth = "0"+getMonth;
}
var getYear = set.getFullYear().toString();
var dateNow = getMonth +splinter+ getDate +splinter+ getYear; //today
return dateNow;
}
format this function is mm dd yyyy
and the dividing you can choice and replace if you want... for example
dateNow("/") you will get 12/12/2014

There is nothing built in, but consider using this if you are already using jQuery (and if not, then you should consider that as well!)
http://plugins.jquery.com/project/jquery-dateFormat

(new Date()).format("MM-dd-yyyy")
N.B. month is "MM" not "mm"

function appendZeros(value,digits){
var c= 1;
initValue = value;
for(i=0;i<digits-1;i++){
c = c*10;
if( initValue < c ){
value = '0' + value;
}
}
return value;
}