Exploring the AngularJS global Date timezone offset

I want to display dates based on the users' time zones.

I am hoping that Angular provides a way to globally configure the Date filter for this purpose. Doing it manually for each case doesn't seem right to me.

My timestamps are already passed through a timestamp() function (which simply multiplies by 1000), but I'd rather not make changes to that function unless it's absolutely necessary.

Update:

I have implemented the following solution and it's working, but I would prefer a method to configure this at a higher level if possible.

$scope.timestamp = function (unix_time) {
    var epoch = (unix_time * 1000);
    var date = new Date();
    var localOffset = (-1) * date.getTimezoneOffset() * 60000;
    var stamp = Math.round(new Date(epoch + localOffset).getTime());
    return stamp;
};

Answer №1

In the latest version of angular 1.4.x, handling date filtering has become much simpler. A recommended approach is to create a decorator that modifies the default date filter before it is executed. This process is straightforward and does not impact performance.

Below is an example decorator that I commonly use. It adds a DEFAULT_TIMEZONE if no timezone is specified, shifting all dates in the application to GMT if no other timezone is specified.

module.config(['$provide', function($provide) {
     var DEFAULT_TIMEZONE = 'GMT';

     $provide.decorator('dateFilter', ['$delegate', '$injector', function($delegate, $injector) {
       var oldDelegate = $delegate;

       var standardDateFilterInterceptor = function(date, format, timezone) {
         if(angular.isUndefined(timezone)) {
           timezone = DEFAULT_TIMEZONE;
         }
         return oldDelegate.apply(this, [date, format, timezone]);
       };

       return standardDateFilterInterceptor;
     }]);
}]);

Answer №2

According to the official documentation:

Understanding Timezones

It is important to note that the Angular datetime filter relies on the time zone settings of the user's browser. This means that the same application may display different time information based on the time zone settings of the device it is being used on. As of now, neither Javascript nor Angular have the capability to display dates with a timezone specified by the developer.

http://docs.angularjs.org/guide/i18n

One way to address this issue is by creating a wrapper type (or class) with your function as a constructor. This should be implemented at the application's entry point to make it accessible throughout the application.

Answer №3

Are you familiar with luxon library? You can find more information about it here:

Another tool similar to Luxon is dayjs, although I have not personally used it before (https://github.com/iamkun/dayjs).

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