From aab79b849f84e7e47e06a15ec2e10f76f3a52d98 Mon Sep 17 00:00:00 2001
From: Sami Samhuri <sami.samhuri@gmail.com>
Date: Sun, 21 Nov 2010 20:24:02 -0800
Subject: [PATCH] [NEW] DateExt.format (like strftime)

---
 lib/date-ext.js | 98 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 lib/date-ext.js

diff --git a/lib/date-ext.js b/lib/date-ext.js
new file mode 100644
index 0000000..da0a7ec
--- /dev/null
+++ b/lib/date-ext.js
@@ -0,0 +1,98 @@
+exports.extendNative = function() {
+    Object.keys(DateExt).forEach(function(k) {
+        if (Date.prototype[k]) return; // don't overwrite existing members
+        Date.prototype[k] = function() {
+            var fn = DateExt[k]
+              , args = [].slice.call(arguments)
+              ;
+            args.shift(this);
+            fn.apply(DateExt, args);
+        };
+    });
+};
+
+var Weekdays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday',
+                'Friday', 'Saturday'];
+
+var WeekdaysShort = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
+
+var Months = ['January', 'February', 'March', 'April', 'May', 'June', 'July',
+              'August', 'September', 'October', 'November', 'December'];
+
+var MonthsShort = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug',
+                   'Sep', 'Oct', 'Nov', 'Dec'];
+
+function pad(n, padding) {
+    padding = padding || '0';
+    return n < 10 ? (padding + n) : n;
+}
+
+var DateExt = {
+    // FIXME write a c extension that uses strftime to do the heavy lifting
+    format: function(d, fmt) {
+        return fmt.replace(/%(.)/, function(_, c) {
+            switch (c) {
+                case 'A': return Weekdays[d.getDay()];
+                case 'a': return WeekdaysShort[d.getDay()];
+                case 'B': return Months[d.getMonth()];
+                case 'b': // fall through
+                case 'h': return MonthsShort[d.getMonth()];
+                case 'D': return DateExt.format(d, '%m/%d/%y');
+                case 'd': return pad(d.getDate());
+                case 'e': return d.getDate();
+                case 'F': return DateExt.format(d, '%Y-%m-%d');
+                case 'H': return pad(d.getHours());
+                case 'I':
+                    var hour = d.getHours();
+                    if (hour == 0) hour = 12;
+                    else if (hour > 12) hour -= 12;
+                    return pad(hour);
+                case 'k': return pad(d.getHours(), ' ');
+                case 'l':
+                    var hour = d.getHours();
+                    if (hour == 0) hour = 12;
+                    else if (hour > 12) hour -= 12;
+                    return pad(hour, ' ');
+                case 'M': return pad(d.getMinutes());
+                case 'm': return pad(d.getMonth() + 1);
+                case 'n': return '\n';
+                case 'p': return d.getHours() < 12 ? 'AM' : 'PM';
+                case 'R': return DateExt.format(d, '%H:%M');
+                case 'r': return DateExt.format(d, '%I:%M:%S %p');
+                case 'S': return pad(d.getSeconds());
+                case 's': return d.getTime();
+                case 'T': return DateExt.format(d, '%H:%M:%S');
+                case 't': return '\t';
+                case 'u':
+                    var day = d.getDay();
+                    return day == 0 ? 7 : day; // 1 - 7, Monday is first day of the week
+                case 'v': return DateExt.format(d, '%e-%b-%Y');
+                case 'w': return d.getDay(); // 0 - 6, Sunday is first day of the week
+                case 'Y': return d.getFullYear();
+                case 'y':
+                    var year = d.getYear();
+                    return year < 100 ? year : year - 100;
+                case 'Z':
+                    var tz = d.toString().match(/\((\w+)\)/);
+                    return tz && tz[1] || '';
+                case 'z':
+                    var off = d.getTimezoneOffset();
+                    return (off < 0 ? '-' : '+') + pad(off / 60) + pad(off % 60);
+                default: return c;
+            }
+        });
+    },
+    month: function(d) {
+        return Months(d.getMonth());
+    },
+    shortMonth: function(d) {
+        return MonthsShort(d.getMonth());
+    }
+    weekday: function(d) {
+        return Weekdays(d.getDay());
+    },
+    shortWeekday: function(d) {
+        return WeekdaysShort(d.getDay());
+    }
+};
+exports.DateExt = DateExt;
\ No newline at end of file