A filter to add or subtract a value from a given date using the methods Add and Subtract

.gitignore

@@ -1,4 +1,5 @@
 /.idea
 /bower_components
 /node_modules
-/coverage
+/coverage
+npm-debug.log

README.md

@@ -121,7 +121,7 @@ For more information about Moment.JS difference function, see the
 
 ### amDurationFormat filter
 
-Formats a duration (such as 5 days) in a human readable format. See [Moment.JS documentation](http://momentjs.com/docs/#/durations/creating/) for a list of supported duration formats, and [`humanize() documentation`](http://momentjs.com/docs/#/durations/humanize/) for explanation about the formatting algorithm. 
+Formats a duration (such as 5 days) in a human readable format. See [Moment.JS documentation](http://momentjs.com/docs/#/durations/creating/) for a list of supported duration formats, and [`humanize() documentation`](http://momentjs.com/docs/#/durations/humanize/) for explanation about the formatting algorithm.
 
 Example:
 
@@ -131,6 +131,32 @@ Example:
 
 Will display the age of the message (e.g. 10 minutes, 1 hour, 2 days, etc).
 
+### amSubtract filter
+
+Subtract values (hours, minutes, seconds ...) from a specified date.
+
+See [Moment.JS documentation](http://momentjs.com/docs/#/durations/creating/) for a list of supported duration formats.
+
+Example:
+
+```html
+<span>Start time: {{day.start | amSubtract : '1' : 'hours' | amDateFormat : 'hh'}} : {{day.start | amSubtract : '30' : 'minutes' | amDateFormat : 'mm'}}</span>
+
+```
+
+### amAdd filter
+
+Add values (hours, minutes, seconds ...) to a specified date.
+
+See [Moment.JS documentation](http://momentjs.com/docs/#/durations/creating/) for a list of supported duration formats.
+
+Example:
+
+```html
+<span>Start time: {{day.start | amAdd : '1' : 'hours' | amDateFormat : 'hh'}} : {{day.start | amAdd : '30' : 'minutes' | amDateFormat : 'mm'}}</span>
+
+```
+
 ### Time zone support
 
 The `amDateFormat` and `amCalendar` filters can be configured to display dates aligned

angular-moment.js

@@ -576,6 +576,48 @@
 				amTimeAgoFilter.$stateful = angularMomentConfig.statefulFilters;
 
 				return amTimeAgoFilter;
+			}])
+
+		/**
+		 * @ngdoc filter
+		 * @name angularMoment.filter:amSubtract
+		 * @module angularMoment
+		 * @function
+		 */
+			.filter('amSubtract', ['moment', 'angularMomentConfig', function (moment, angularMomentConfig) {
+				function amSubtractFilter(value, amount, type) {
+
+					if (typeof value === 'undefined' || value === null) {
+						return '';
+					}
+
+					return moment(value).subtract(parseInt(amount, 10), type);
+				}
+
+				amSubtractFilter.$stateful = angularMomentConfig.statefulFilters;
+
+				return amSubtractFilter;
+			}])
+
+		/**
+		 * @ngdoc filter
+		 * @name angularMoment.filter:amAdd
+		 * @module angularMoment
+		 * @function
+		 */
+			.filter('amAdd', ['moment', 'angularMomentConfig', function (moment, angularMomentConfig) {
+				function amAddFilter(value, amount, type) {
+
+					if (typeof value === 'undefined' || value === null) {
+						return '';
+					}
+
+					return moment(value).add(parseInt(amount, 10), type);
+				}
+
+				amAddFilter.$stateful = angularMomentConfig.statefulFilters;
+
+				return amAddFilter;
 			}]);
 	}