1 files changed, 26 insertions, 0 deletions
diff --git a/src/duration.ts b/src/duration.ts
new file mode 100644
index 0000000..18849a0
--- /dev/null
+++ b/src/duration.ts
@@ -0,0 +1,26 @@
+import moment from 'moment';
+
+export type TimeUnit = moment.unitOfTime.DurationConstructor;
+
+export class Duration {
+    value: number;
+    unit: TimeUnit;
+    constructor(value: number, unit: TimeUnit) {
+        this.value = value
+        this.unit = unit
+    }
+
+    isValid() { return moment.duration(this.value, this.unit).isValid(); }
+    toMoment() {
+        let m = moment.duration(this.value, this.unit);
+        if (m.isValid()) return m;
+        return null;
+    }
+
+    static days(n: number) { return new Duration(n, 'days'); }
+    static weeks(n: number) { return new Duration(n, 'weeks'); }
+    static months(n: number) { return new Duration(n, 'months'); }
+
+    deflate() { return { value: this.value, unit: this.unit }; }
+    static inflate = (obj: { value: number, unit: TimeUnit }) => new Duration(obj.value, obj.unit);
+}