1 files changed, 55 insertions, 0 deletions
diff --git a/library/moment/src/lib/duration/as.js b/library/moment/src/lib/duration/as.js
new file mode 100644
index 000000000..03ecd6dab
--- /dev/null
+++ b/library/moment/src/lib/duration/as.js
@@ -0,0 +1,55 @@
+import { daysToMonths, monthsToDays } from './bubble';
+import { normalizeUnits } from '../units/aliases';
+import toInt from '../utils/to-int';
+
+export function as (units) {
+    var days;
+    var months;
+    var milliseconds = this._milliseconds;
+
+    units = normalizeUnits(units);
+
+    if (units === 'month' || units === 'year') {
+        days   = this._days   + milliseconds / 864e5;
+        months = this._months + daysToMonths(days);
+        return units === 'month' ? months : months / 12;
+    } else {
+        // handle milliseconds separately because of floating point math errors (issue #1867)
+        days = this._days + Math.round(monthsToDays(this._months));
+        switch (units) {
+            case 'week'   : return days / 7     + milliseconds / 6048e5;
+            case 'day'    : return days         + milliseconds / 864e5;
+            case 'hour'   : return days * 24    + milliseconds / 36e5;
+            case 'minute' : return days * 1440  + milliseconds / 6e4;
+            case 'second' : return days * 86400 + milliseconds / 1000;
+            // Math.floor prevents floating point math errors here
+            case 'millisecond': return Math.floor(days * 864e5) + milliseconds;
+            default: throw new Error('Unknown unit ' + units);
+        }
+    }
+}
+
+// TODO: Use this.as('ms')?
+export function valueOf () {
+    return (
+        this._milliseconds +
+        this._days * 864e5 +
+        (this._months % 12) * 2592e6 +
+        toInt(this._months / 12) * 31536e6
+    );
+}
+
+function makeAs (alias) {
+    return function () {
+        return this.as(alias);
+    };
+}
+
+export var asMilliseconds = makeAs('ms');
+export var asSeconds      = makeAs('s');
+export var asMinutes      = makeAs('m');
+export var asHours        = makeAs('h');
+export var asDays         = makeAs('d');
+export var asWeeks        = makeAs('w');
+export var asMonths       = makeAs('M');
+export var asYears        = makeAs('y');