reset time when first arg is null or undefined

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.0.1
+
+**Bug fixes:**
+- Allow to reset time when first argument is `null` or `undefined`.
+
 ## 0.0.0
 
 First release! :tada:

package.json

@@ -1,6 +1,6 @@
 {
   "name": "timeshift",
-  "version": "0.0.0",
+  "version": "0.0.1",
   "description": "Time shifting in JavaScript",
   "author": "David Hérault <dherault@nelson.ai> (https://github.com/dherault)",
   "license": "SEE LICENSE IN LICENSE",

src/index.js

@@ -2,7 +2,7 @@ const OriginalDate = Date;
 
 function timeshift(...args) {
 
-  if (!args.length) return Date = OriginalDate;
+  if (!args.length || args[0] === null || typeof args[0] === 'undefined') return Date = OriginalDate;
 
   const diff = OriginalDate.now() - new OriginalDate(...args).getTime();