diff --git a/lib/OpenLayers/BaseTypes.js b/lib/OpenLayers/BaseTypes.js
index ce664dfa0b..4755a2388e 100644
--- a/lib/OpenLayers/BaseTypes.js
+++ b/lib/OpenLayers/BaseTypes.js
@@ -295,7 +295,25 @@ OpenLayers.Number = {
             str = integer + dsep + rem;
         }
         return str;
-    }
+    },
+
+    /**
+     * Method: zeroPad
+     * Create a zero padded string optionally with a radix for casting numbers.
+     *
+     * Parameters:
+     * num - {Number} The number to be zero padded.
+     * len - {Number} The length of the string to be returned.
+     * radix - {Number} An integer between 2 and 36 specifying the base to use
+     *     for representing numeric values.
+     */
+    zeroPad: function(num, len, radix) {
+        var str = num.toString(radix || 10);
+        while (str.length < len) {
+            str = "0" + str;
+        }
+        return str;
+    }    
 };
 
 /**
diff --git a/lib/OpenLayers/BaseTypes/Date.js b/lib/OpenLayers/BaseTypes/Date.js
index 30fcf20337..2646f2472f 100644
--- a/lib/OpenLayers/BaseTypes/Date.js
+++ b/lib/OpenLayers/BaseTypes/Date.js
@@ -49,13 +49,6 @@ OpenLayers.Date = {
                 return date.toISOString();
             };
         } else {
-            function pad(num, len) {
-                var str = num + "";
-                while (str.length < len) {
-                    str = "0" + str;
-                }
-                return str;
-            }
             return function(date) {
                 var str;
                 if (isNaN(date.getTime())) {
@@ -65,12 +58,12 @@ OpenLayers.Date = {
                 } else {
                     str =
                         date.getUTCFullYear() + "-" +
-                        pad(date.getUTCMonth() + 1, 2) + "-" +
-                        pad(date.getUTCDate(), 2) + "T" +
-                        pad(date.getUTCHours(), 2) + ":" +
-                        pad(date.getUTCMinutes(), 2) + ":" +
-                        pad(date.getUTCSeconds(), 2) + "." +
-                        pad(date.getUTCMilliseconds(), 3) + "Z";
+                        OpenLayers.Number.zeroPad(date.getUTCMonth() + 1, 2) + "-" +
+                        OpenLayers.Number.zeroPad(date.getUTCDate(), 2) + "T" +
+                        OpenLayers.Number.zeroPad(date.getUTCHours(), 2) + ":" +
+                        OpenLayers.Number.zeroPad(date.getUTCMinutes(), 2) + ":" +
+                        OpenLayers.Number.zeroPad(date.getUTCSeconds(), 2) + "." +
+                        OpenLayers.Number.zeroPad(date.getUTCMilliseconds(), 3) + "Z";
                 }
                 return str;
             };
diff --git a/lib/OpenLayers/Layer/ArcGISCache.js b/lib/OpenLayers/Layer/ArcGISCache.js
index e52ea645e6..228e90dbfb 100644
--- a/lib/OpenLayers/Layer/ArcGISCache.js
+++ b/lib/OpenLayers/Layer/ArcGISCache.js
@@ -457,9 +457,9 @@ OpenLayers.Layer.ArcGISCache = OpenLayers.Class(OpenLayers.Layer.XYZ, {
             url = url + '/tile/${z}/${y}/${x}';
         } else {
             // The tile images are stored using hex values on disk.
-            x = 'C' + this.zeroPad(x, 8, 16);
-            y = 'R' + this.zeroPad(y, 8, 16);
-            z = 'L' + this.zeroPad(z, 2, 16);
+            x = 'C' + OpenLayers.Number.zeroPad(x, 8, 16);
+            y = 'R' + OpenLayers.Number.zeroPad(y, 8, 16);
+            z = 'L' + OpenLayers.Number.zeroPad(z, 2, 16);
             url = url + '/${z}/${y}/${x}.' + this.type;
         }
 
@@ -471,23 +471,5 @@ OpenLayers.Layer.ArcGISCache = OpenLayers.Class(OpenLayers.Layer.XYZ, {
         );
     },
 
-    /**
-     * Method: zeroPad
-     * Create a zero padded string optionally with a radix for casting numbers.
-     *
-     * Parameters:
-     * num - {Number} The number to be zero padded.
-     * len - {Number} The length of the string to be returned.
-     * radix - {Number} An integer between 2 and 36 specifying the base to use
-     *     for representing numeric values.
-     */
-    zeroPad: function(num, len, radix) {
-        var str = num.toString(radix || 10);
-        while (str.length < len) {
-            str = "0" + str;
-        }
-        return str;
-    },
-
     CLASS_NAME: 'OpenLayers.Layer.ArcGISCache' 
 }); 
diff --git a/lib/OpenLayers/Layer/TileCache.js b/lib/OpenLayers/Layer/TileCache.js
index 081969fc33..07fddf8954 100644
--- a/lib/OpenLayers/Layer/TileCache.js
+++ b/lib/OpenLayers/Layer/TileCache.js
@@ -116,31 +116,16 @@ OpenLayers.Layer.TileCache = OpenLayers.Class(OpenLayers.Layer.Grid, {
         var tileZ = this.serverResolutions != null ?
             OpenLayers.Util.indexOf(this.serverResolutions, res) :
             this.map.getZoom();
-        /**
-         * Zero-pad a positive integer.
-         * number - {Int} 
-         * length - {Int} 
-         *
-         * Returns:
-         * {String} A zero-padded string
-         */
-        function zeroPad(number, length) {
-            number = String(number);
-            var zeros = [];
-            for(var i=0; i<length; ++i) {
-                zeros.push('0');
-            }
-            return zeros.join('').substring(0, length - number.length) + number;
-        }
+
         var components = [
             this.layername,
-            zeroPad(tileZ, 2),
-            zeroPad(parseInt(tileX / 1000000), 3),
-            zeroPad((parseInt(tileX / 1000) % 1000), 3),
-            zeroPad((parseInt(tileX) % 1000), 3),
-            zeroPad(parseInt(tileY / 1000000), 3),
-            zeroPad((parseInt(tileY / 1000) % 1000), 3),
-            zeroPad((parseInt(tileY) % 1000), 3) + '.' + this.extension
+            OpenLayers.Number.zeroPad(tileZ, 2),
+            OpenLayers.Number.zeroPad(parseInt(tileX / 1000000), 3),
+            OpenLayers.Number.zeroPad((parseInt(tileX / 1000) % 1000), 3),
+            OpenLayers.Number.zeroPad((parseInt(tileX) % 1000), 3),
+            OpenLayers.Number.zeroPad(parseInt(tileY / 1000000), 3),
+            OpenLayers.Number.zeroPad((parseInt(tileY / 1000) % 1000), 3),
+            OpenLayers.Number.zeroPad((parseInt(tileY) % 1000), 3) + '.' + this.extension
         ];
         var path = components.join('/'); 
         var url = this.url;
diff --git a/tests/BaseTypes.html b/tests/BaseTypes.html
index cc391003da..045ac65491 100644
--- a/tests/BaseTypes.html
+++ b/tests/BaseTypes.html
@@ -278,6 +278,17 @@
         OpenLayers.Number.decimalSeparator = ",";
         t.eq(format(num, 3), "12.345,679", "changing thousands/decimal separator globally works");
     }
+    
+    function test_Number_zeroPad(t) {
+        t.plan(6);
+        var pad = OpenLayers.Number.zeroPad;
+        t.eq(pad(15, 4), "0015", "left padding works");
+        t.eq(pad(15, 2), "15", "no left padding when equal to number of digits");
+        t.eq(pad(15, 1), "15", "no left padding when less than number of digits");
+        t.eq(pad(10, 5, 2), "01010", "radix modified and padding works");
+        t.eq(pad(10, 5, 8), "00012", "radix modified and padding works");
+        t.eq(pad(10, 5, 36), "0000a", "radix modified and padding works");
+    }
 
     function test_Function_bind(t) {
         t.plan(12);
diff --git a/tests/Layer/ArcGISCache.html b/tests/Layer/ArcGISCache.html
index 0b54464493..b5ed5d5aaf 100644
--- a/tests/Layer/ArcGISCache.html
+++ b/tests/Layer/ArcGISCache.html
@@ -187,7 +187,9 @@
     }
         
     /**
-     * Check our utility function for generating tile indexes against a file cache
+     * Check the utility function for generating tile indexes against a file cache
+     * This is already tested in BaseTypes test, but these are specific,
+     * common conversions that this class will rely on, so the tests are retained
      */
     function test_Layer_ARCGISCACHE_zeroPad(t) {
         t.plan(4);
@@ -195,10 +197,10 @@
         var layer = new OpenLayers.Layer.ArcGISCache('test', null, { });
 
         //some tile examples
-        t.ok('00000001' == layer.zeroPad(1, 8, 16), 'zeroPad should generate tile indexes properly ');
-        t.ok('00000020' == layer.zeroPad(32, 8, 16), 'zeroPad should generate tile indexes properly ');
-        t.ok('00000100' == layer.zeroPad(256, 8, 16), 'zeroPad should generate tile indexes properly ');
-        t.ok('00001000' == layer.zeroPad(4096, 8, 16), 'zeroPad should generate tile indexes properly ');        
+        t.ok('00000001' == OpenLayers.Number.zeroPad(1, 8, 16), 'zeroPad should generate tile indexes properly ');
+        t.ok('00000020' == OpenLayers.Number.zeroPad(32, 8, 16), 'zeroPad should generate tile indexes properly ');
+        t.ok('00000100' == OpenLayers.Number.zeroPad(256, 8, 16), 'zeroPad should generate tile indexes properly ');
+        t.ok('00001000' == OpenLayers.Number.zeroPad(4096, 8, 16), 'zeroPad should generate tile indexes properly ');        
     }
     
     /**