Is there a JQuery plugin to convert UTC datetimes to local user timezone?

Question

If I have a tag:

<span class="utctime">2010-01-01 11:30 PM</span>

I would like a jquery script or plug in to convert every utctime class to the current user's browser local time. I would prefer to find this before writing one.

Answer 1

Ok, so I created one that does it:

/*
    Note: this requires that the JQuery-DateFormat plugin (available here) be loaded first
    http://plugins.jquery.com/project/jquery-dateFormat
*/

(function ($) {
    $.fn.localTimeFromUTC = function (format) {

        return this.each(function () {

            // get time offset from browser
            var currentDate = new Date();
            var offset = -(currentDate.getTimezoneOffset() / 60);

            // get provided date
            var tagText = $(this).html();
            var givenDate = new Date(tagText);

            // apply offset
            var hours = givenDate.getHours();
            hours += offset;
            givenDate.setHours(hours);

            // format the date
            var localDateString = $.format.date(givenDate, format);
            $(this).html(localDateString);
        });
    };
})(jQuery);

Usage:

    <span class="utcdate">2/5/2010 10:30 PM</span>

    $('.utcdate').localTimeFromUTC('MM/dd/yyyy hh:mm a');

Answer 2

Use input date to find time zone offset. Important for DST changes.

(function ($) {
$.fn.localTimeFromUTC = function (format) {
    return this.each(function () {

        // get provided date 
        var tagText = $(this).html();
        var givenDate = new Date(tagText);

        if(givenDate == 'NaN') return;

        // get time offset from browser 
        var offset = -(givenDate.getTimezoneOffset() / 60);

        // apply offset 
        var hours = givenDate.getHours();
        hours += offset;
        givenDate.setHours(hours);

        // format the date 
        var localDateString = $.format.date(givenDate, format);
        $(this).html(localDateString);


    });
};
})(jQuery); 

Use it like....

function ConvertDatesToLocalTime() {
        $('.ConvertUtcToLocal').localTimeFromUTC('MM/dd/yyyy hh:mm:ss a');
    }

    $(document).ready(function () {
        ConvertDatesToLocalTime();

    });

Assign 'ConvertUtcToLocal' class to all elements requiring conversion.

Answer 3

$(".localdatetime").each(function () {
        var datestr = $(this).text();
        //alert(datestr);
        if (datestr.trim() != '') {
            var dateOb = (new Date(Date.parse(datestr, 'MM-dd-yyyy HH:mm'))).setTimezone("GMT").toString('dd MMM yyyy hh:mm tt');
            //alert(dateOb);
            $(this).text(dateOb);
        }
    })

this can also be used along with Date.js library to display time in user timezone