2 files changed, 11 insertions, 20 deletions
diff --git a/www/js/todo.js b/www/js/todo.js
index 23768b7..dd9acb1 100644
--- a/www/js/todo.js
+++ b/www/js/todo.js
@@ -32,7 +32,7 @@ var shows = null;
 rh.ShowList = function(d) {
   this.$this = $(this);
   this.shows = [];
-  if((Object.prototype.toString.call(d) !== '[object Date]') || (d.toString() === 'Invalid Date')) {
+  if(!is_valid_date(d)) {
     this.current = new Date();
   } else {
     this.current = d;
@@ -59,8 +59,7 @@ rh.ShowList.prototype.fetch = function() {
       self.$this.trigger('update');
     }
   }).fail(function() {
-    if((Object.prototype.toString.call(self.last_succeeded) === '[object Date]') &&
-       (self.last_succeeded.toString() !== 'Invalid Date')) {
+    if(is_valid_date(self.last_succeeded)) {
       self.current = self.last_succeeded;
       self.current_week = get_rd_week(self.current.valueOf());
       self.$this.trigger('update');
@@ -178,7 +177,7 @@ function todo_init() {
   var d = new Date();
   if(url.path.length > 1) {
     var tmp = new Date(url.path[1]);
-    if((Object.prototype.toString.call(tmp) === '[object Date]') && (tmp.toString() !== 'Invalid Date')) {
+    if(is_valid_date(tmp)) {
       d = tmp;
     }
   }
diff --git a/www/js/utils.js b/www/js/utils.js
index ae2ad0a..7bd5035 100644
--- a/www/js/utils.js
+++ b/www/js/utils.js
@@ -21,6 +21,10 @@
 
 'use strict';
 
+function is_valid_date(d) {
+  return (Object.prototype.toString.call(d) === '[object Date]') && (d.toString() !== 'Invalid Date')
+}
+
 Number.prototype.pad = function(size) {
   var s = String(this);
   while (s.length < (size || 2)) {s = "0" + s;}
@@ -55,20 +59,14 @@ monthname[11] = 'Dezember';
 var monthname_short = new Array('Jan', 'Feb', 'Mär', 'Apr', 'Mai', 'Jun', 'Jul', 'Aug', 'Sep', 'Okt', 'Nov', 'Dez');
 
 function format_date_iso(d) {
-  if(Object.prototype.toString.call(d) !== '[object Date]') {
-    return '-';
-  }
-  if (d.toString() === 'Invalid Date') {
+  if(!is_valid_date(d)) {
     return '-';
   }
   return d.getFullYear() + '-' + Number(d.getMonth() + 1).pad(2) + '-' + Number(d.getDate()).pad(2);
 }
 
 function format_date(d) {
-  if(Object.prototype.toString.call(d) !== '[object Date]') {
-    return '-';
-  }
-  if (d.toString() === 'Invalid Date') {
+  if(!is_valid_date(d)) {
     return '-';
   }
   var datestr = weekday_short[d.getDay()];
@@ -79,10 +77,7 @@ function format_date(d) {
 }
 
 function format_time(d) {
-  if(Object.prototype.toString.call(d) !== '[object Date]') {
-    return '-';
-  }
-  if (d.toString() === 'Invalid Date') {
+  if(!is_valid_date(d)) {
     return '-';
   }
   var timestr = Number(d.getHours()).pad(2);
@@ -92,10 +87,7 @@ function format_time(d) {
 }
 
 function format_datetime(d) {
-  if(Object.prototype.toString.call(d) !== '[object Date]') {
-    return '-';
-  }
-  if (d.toString() === 'Invalid Date') {
+  if(!is_valid_date(d)) {
     return '-';
   }
   var datetimestr = weekday_short[d.getDay()];