How can I convert a UTC time into proper date - time format using Javascript?
This is what I want to do
var d = new Date("2014-01-01");
var new_d = d.toUTC(); // 1388534400000
var old_d = function(new_d){
// return "2014-01-01" // how can i get this?
}
Now How, can i get orignal date - 2014-01-01 from 1388534400000?
****Also, Please note that when i do this --- new Date(1388534400000); it gives date 1 day less. That is, instead of giving Jan 01 2014 , it gives Dec 31 2013 . But, I want Jan 01 2014.****
Is there any method to do the opposite of toUTC() method?
// _________ For those whose toUTC() doesnt work
"toUTC" method works in console of my chrome See screen shot below
When you pass a string containing hyphens to the Date
constructor, it will treat that as UTC. And if you don't pass a time, it will consider it to be midnight. If you are in a time zone that is behind UTC (such as in most of the Americas), you will see the wrong local time conversion.
Here's a screenshot of my chrome dev console, so you can see what I mean
If I pass slashes instead:
Consider using moment.js - which will accept a format parameter that will help you avoid this issue.
尝试使用以下内容:
new Date(new_d);
The problem lies with the way you instantiate the Date . Javascript interpretes the hyphens as an utc date, and slashes as local dates.
Giving the results that mark Explains.
var utcDate = new Date('2014-01-01') // returns a UTC date
var localDate = new Date('2014/01/01'); // Returns local date
But to translate a date back to your starting point string, you can do the following.
function toDateString(utcMillis){
var date = new Date(utcMillis);
d = date.getDate();
m = date.getMonth() +1;
y = date.getFullYear();
return y + '-' + addLeadingZero(m, 2) + '-' + addLeadingZero(d,2);
}
function addLeadingZero(n, length){
n = n+'';
if(n.length<length)
return addLeadingZero('0'+n, length--);
else
return n;
}
function toUTCDateString(utcMillis){
var date = new Date(utcMillis);
d = date.getUTCDate();
m = date.getUTCMonth() +1;
y = date.getUTCFullYear();
return y + '-' + addLeadingZero(m, 2) + '-' + addLeadingZero(d,2);
}
To play around with it, and see it for yourself, see this Fiddle:
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