Angular filter to transform a time unit to a date

date-from-time-unit.filter.js

(function() {
    'use strict';

    angular
        .module('myApp')
        .filter('DateFromTimeUnit', DateFromTimeUnit);

    var DATE_METHODS = {
        milliseconds: Date.prototype.setMilliseconds,
        seconds: Date.prototype.setSeconds,
        minutes: Date.prototype.setMinutes,
        hours: Date.prototype.setHours,
        days: Date.prototype.setDate,
        years: Date.prototype.setFullYear
    };

    /**
    * Shorthands
    **/

    DATE_METHODS.ms = DATE_METHODS.milliseconds;
    DATE_METHODS.s = DATE_METHODS.seconds;
    DATE_METHODS.m = DATE_METHODS.minutes;
    DATE_METHODS.h = DATE_METHODS.hours;
    DATE_METHODS.d = DATE_METHODS.days;
    DATE_METHODS.y = DATE_METHODS.years;

    function DateFromTimeUnit() {
        return execute;

        function execute (input, from) {

            from = from || 'ms';

            if (isNaN(input) || !DATE_METHODS[from])
                return input;

            var date = new Date(1970, 0, 1);

            return DATE_METHODS[from].call(date, input)

        }
    }
})();