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Parse from String to DateTime

I have a date in format YYYYMMDDTHHMMSS and need to get the date in format DD.MM.YYYY HH:MM:SS .
I do such:
var dateTimeFormat;
var dateAsString = dataTimeFormat.split('', dateTimeFormat.lenght);
var year = dateAsString.splice(0, 4).join('');
var month = dateAsString.splice(0, 2).join('');
var day = dateAsString.splice(0, 2).join('');
var hours = dateAsString.splice(1, 2).join('');
var minutes = dateAsString.splice(1, 2).join('');
var seconds = dateAsString.splice(1, 2).join('');
var date = day + '.' + month + '.' + year + ' ' + hours + ':' + minutes + ':' + seconds;
return date;
But how can I convert date to Date format?

After transforming string into a known format, Date::parse() will be enough:
var yourDate = new Date(Date.parse(date));
WORKING DEMO:
var date = "2016.06.15 10:10:10";
var yourDate = new Date(Date.parse(date));
alert(yourDate);
NOTE: your format is a bit weird, but maybe parse will accept it as long as it accept many string formats such as:
Date.parse("Aug 9, 1995");
Date.parse("Wed, 09 Aug 1995 00:00:00");
Date.parse("Wed, 09 Aug 1995 00:00:00 GMT");

i think this is easy way to do this =). hope it help
<script>
dateTimeFormat = '20161506T112130';
str = dateTimeFormat.split("");
date = str[0] + str[1] + str[2] + str[3] + '.' + str[4] + str[5] + '.' + str[6] + str[7] + ' ' + str[9] + str[10] + ':' + str[11] + str[12] + ':' + str[13] + str[14];
console.log(date);
</script>

Format dates in Javascript

I have to log my error with datetime in some file, for that I am using following code:
var dLogDate = new Date();
console.log(dLogDate.toString().substring(4) + ', ' + dLogDate.toGMTString().substring(4));
as per above code output comes as follows which is nice but not formated as I need:
"Oct 10 2014 12:48:59 GMT+0530 (IST), 10 Oct 2014 07:18:59 GMT"
I want result s follows :
"10 Oct 2014 12:48:59 (IST), 10 Oct 2014 07:18:59 (GMT)"
see date part before ",". I need 10 Oct instated of Oct 10
This can be done with some function which is substring first 4 character from string and concat at 3rd position again, But I am still curious to know if there are any other simple way to do this? I don't want to use any third party library/script.
Thanks.

You could try adding to the prototype an extension method toISTString
function pad(n) {
return (n < 10) ? '0' + n : n;
}
Date.prototype.toISTString = function(locale) {
var year = this.getFullYear().toString();
var month = this.toLocaleString(locale, { month: "short" }) // ECMAScript Internationalization API, which is very new only available in Blink browsers (Chrome and Opera), IE11, and Firefox 29+.
var day = this.getDate().toString();
var hrs = this.getHours().toString();
var mins = this.getMinutes().toString();
var secs = this.getSeconds().toString();
return day + " " + month + " " + year + " " + pad(hrs) + ":" + pad(mins) + ":" + secs + " (IST)";
};
dLogDate = new Date();
console.log(dLogDate.toISTString("en-us") + ', ' + dLogDate.toGMTString().substring(4));
JSFiddle

You can use date functions to format date
http://www.w3schools.com/jsref/jsref_obj_date.asp
var monthIndex = date.getMonth();
var dayIndex = date.getDay();
var monthArray = ['January',....];
var dayArray = ['Sunday',...]
console.log(monthArray[monthIndex] + "-" + dayArray[dayIndex]);

Javascript DateTime toString issues

I'm trying to convert a Date to String with the following function:
Date.prototype.yyyymmdd = function () {
this.setHours(this.getHours() - 2);
var yyyy = this.getFullYear().toString();
var mm = (this.getMonth() + 1).toString(); // getMonth() is zero-based
var dd = this.getDate().toString();
var hh = this.getHours().toString();
var mm1 = this.getMinutes().toString();
return yyyy + '-' + (mm[1] ? mm : "0" + mm[0]) + '-' + (dd[1] ? dd : "0" + dd[0]) + ' ' + (hh[1] ? hh : "0" + hh[0]) + ':' + (mm1[1] ? mm1 : "0" + mm1[0]);
};
I use this line of code to test my convert method:
(value.lastConnectedAt == null ? emptyvalue : value.lastConnectedAt + " + " + new Date(value.lastConnectedAt).yyyymmdd())
I'm getting some really wierd results:
2014-06-23T08:43:42Z + 2014-43-23 08:43
The month is totally wrong, and the 2 hours arn't added. What am i doing wrong?

As for the explanation of your problem:
you get month = 43 instead of 06 because most probably you had a bug in a version that is different to the one posted where you had mm1 instead of mm[1] ; so you get month = minutes = 43
you get hours = 08 instead of your expected 06 most probably because your PC is on a timezone with UTC+02. getHours / setHours are expressed in local time. Use setUTCHours / getUTCHours instead

You don't need your own function, there's a javascript function that will convert date and time to string for you:
alert(new Date().toString())
output:
"Thu Aug 21 2014 12:20:38 GMT+0500 (Pakistan Standard Time)"

Javascript Date Object Issues With First Day of Month

I'm working with Javascript dates, and I'm getting a bit confused with trying to take a date from a string.
This is the code I have:
var formatDate = function(dateObj) {
// make sure date values are two digits and months start at 1
var adjMonth = dateObj.getMonth() + 1;
var adjDate = dateObj.getDate();
if (adjMonth < 10) adjMonth = '0' + adjMonth;
if (adjDate < 10) adjDate = '0' + adjDate;
// build and return dateStr
var dateStr = dateObj.getFullYear() + '-' + adjMonth + '-' + adjDate;
return dateStr;
};
$(document).ready(function() {
var testIn1 = "2012-02-01";
var testDate1 = new Date(testIn1);
var testDate1Str = formatDate(testDate1);
var testIn2 = "2012-01-31";
var testDate2 = new Date(testIn2);
var testDate2Str = formatDate(testDate2);
$('#output').html("---Input = '" + testIn1 + "':<br>" + testDate1 + "<br>" + testDate1Str + "<br>"
+"---Input = '" + testIn2 + "':<br>" + testDate2 + "<br>" + testDate2Str + "<br>");
});​
Results I get from this are:
---Input = '2012-02-01':
Tue Jan 31 2012 18:00:00 GMT-0600 (CST)
2012-01-31
---Input = '2012-01-31':
Mon Jan 30 2012 18:00:00 GMT-0600 (CST)
2012-01-30
Which makes no sense to me, why are the days one off? Doesn't seem sensical to get 2012-01-31 from 2012-02-01... What am I missing here?

It looks like Date.parse uses 00:00:00 GMT if you don't pass a time, and it will be 18:00:00 the previous day in your time zone (GMT-6). If you do pass an explicit time, then this behaviour is suppressed:
Date.parse(testIn1 + " 00:00:00");

How to get a date in this form?

I need to get a date in this form:
"12/31/2020 5:00 AM"
I wrote this code:
var ExpireI = new Date ();
ExpireI.setTime(ExpireI.getTime() + (24 * 3600 * 1000));
alert(ExpireI.toGMTString());
but it display something like this:
Tue, 26 Jun 2012 10:26:35 GMT
so, how can I get a date in that form ?

Try this
Instead of doing this way:
getDate() // Returns the date
getMonth() // Returns the month
getFullYear() // Returns the year
And for your case, you can use this way:
alert(ExpireI.getFullYear() + "-" + ExpireI.getMonth() + "-" + ExpireI.getDate());
Fiddle here... :)

This should work,
var d = new Date ();
var date = d.getDate();
var month = d.getMonth() + 1; // because january is 0 in javascript
var year = d.getFullYear();
var hour = d.getHours();
var min = d.getMinutes();
var m;
if(hour > 12 ){
hour-=12;
m = 'PM';
}
else{
m = 'AM';
}
console.log(month + '/' + date + '/' + year + ' ' + hour + ':' + min + ' ' + m);