diff --git a/Date.js b/Date.js
index 0186543..b24eb55 100644
--- a/Date.js
+++ b/Date.js
@@ -57,7 +57,7 @@ object.Mixin('DateMixin', 'soft', {
 		str = ' '+str
 		var c = 
 			(/[^a-z](m(illi)?(-)?s(ec(ond(s)?)?)?)$/i.test(str)
-		   			|| /^[0-9]*(\.[0-9]+)?$/.test(str) ) ? 
+		   			|| /^([0-9]*\.)?[0-9]+$/.test(str) ) ? 
 				1
 			: /[^a-z]s(ec(ond(s)?)?)?$/i.test(str) ? 
 				1000
@@ -75,6 +75,8 @@ object.Mixin('DateMixin', 'soft', {
 
 	isPeriod: function(str){
 		return !isNaN(this.str2ms(str)) },
+	isDateStr: function(str){
+		return !isNaN(new Date(str).valueOf()) },
 })
 
 
diff --git a/README.md b/README.md
index 1cfdac5..9d57e13 100644
--- a/README.md
+++ b/README.md
@@ -1872,8 +1872,8 @@ Add a value to the generator sequence at start/end.
     -> <generator>
 ```
 
-Value added by `.unshift(..)` will be yielded by `<generator>` "first", i.e. on _next_ call to `.next()`, regardless of the current generator state.
-
+Value added by `.unshift(..)` will be yielded by `<generator>` "first", i.e. on 
+_next_ call to `.next()`, regardless of the current generator state.
 
 
 #### `<generator>.promise()`
@@ -2035,6 +2035,7 @@ currently which may not be the first element in the sequence.
 Equivalents to [`<generator>`'s `.shift(..)`/`.pop(..)`/..](#generatorshift--generatorpop--generatorgshift--generatorgpop) 
 but returning a reusable `<func>`/`<Generator>`.
 
+
 #### `<generator>.unshift(..)` / `<generator>.push(..)`
 
 ```bnf
diff --git a/package.json b/package.json
index 5f80d66..fef721e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ig-types",
-  "version": "6.9.3",
+  "version": "6.9.4",
   "description": "Generic JavaScript types and type extensions...",
   "main": "main.js",
   "scripts": {