function amTimezone(value, timezone) {
					var aMoment = amMoment.preprocessDate(value);

					if (!timezone) {
						return aMoment;
					}

					if (aMoment.tz) {
						return aMoment.tz(timezone);
					} else {
						$log.warn('angular-moment: named timezone specified but moment.tz() is undefined. Did you forget to include moment-timezone.js ?');
						return aMoment;
					}
				}
@ngdoc filter
@name angularMoment.filter:amTimezone
@module angularMoment

@description
Apply a timezone onto a given moment object, e.g. 'America/Phoenix').

You need to include moment-timezone.js for timezone support.