Date.format support for 'P' - by Bo Fussing

diff --git a/Date.js b/Date.js
index 365334d..8890490 100644 (file)
--- a/Date.js
+++ b/Date.js
@@ -48,6 +48,7 @@ Format  Output      Description
   i      05         Minutes with leading zeros
   s      01         Seconds, with leading zeros
   O      -0600      Difference to Greenwich time (GMT) in hours
+  P      -06:00     Difference to Greenwich time (GMT) with colon between hours and minutes
   T      CST        Timezone setting of the machine running the code
   Z      -21600     Timezone offset in seconds (negative if west of UTC, positive if east)
 </pre>
@@ -214,6 +215,8 @@ Date.getFormatCode = function(character) {
         return "String.leftPad(this.getSeconds(), 2, '0') + ";
     case "O":
         return "this.getGMTOffset() + ";
+    case "P":
+       return "this.getGMTColonOffset() + ";
     case "T":
         return "this.getTimezone() + ";
     case "Z":
@@ -426,6 +429,17 @@ Date.formatCodeToRegex = function(character, currentGroup) {
                 "    (sn + String.leftPad(hr, 2, 0) + String.leftPad(mn, 2, 0)) : null;\n"
             ].join(""),
             s:"([+\-]\\d{4})"};
+    case "P":
+       return {g:1,
+               c:[
+                  "o = results[", currentGroup, "];\n",
+                  "var sn = o.substring(0,1);\n",
+                  "var hr = o.substring(1,3)*1 + Math.floor(o.substring(4,6) / 60);\n",
+                  "var mn = o.substring(4,6) % 60;\n",
+                  "o = ((-12 <= (hr*60 + mn)/60) && ((hr*60 + mn)/60 <= 14))?\n",
+                       "    (sn + String.leftPad(hr, 2, 0) + String.leftPad(mn, 2, 0)) : null;\n"
+            ].join(""),
+            s:"([+\-]\\d{4})"};
     case "T":
         return {g:0,
             c:null,
@@ -460,6 +474,18 @@ Date.prototype.getGMTOffset = function() {
         + String.leftPad(this.getTimezoneOffset() % 60, 2, "0");
 };
 
+/**
+ * Get the offset from GMT of the current date (equivalent to the format specifier 'P').
+ * @return {String} 2-characters representing hours and 2-characters representing minutes
+ * seperated by a colon and prefixed with + or - (e.g. '-06:00')
+ */
+Date.prototype.getGMTColonOffset = function() {
+       return (this.getTimezoneOffset() > 0 ? "-" : "+")
+               + String.leftPad(Math.abs(Math.floor(this.getTimezoneOffset() / 60)), 2, "0")
+               + ":"
+               + String.leftPad(this.getTimezoneOffset() %60, 2, "0");
+}
+
 /**
  * Get the numeric day number of the year, adjusted for leap year.
  * @return {Number} 0 through 364 (365 in leap years)
@@ -775,4 +801,4 @@ Date.prototype.add = function(interval, value){
       break;
   }
   return d;
-};
\ No newline at end of file
+};