diff --git a/Readme.md b/Readme.md
index 9a9c86b..7725f2b 100644
--- a/Readme.md
+++ b/Readme.md
@@ -129,16 +129,18 @@ e.g. `%q` becomes `q`. Use `%%` to get a literal `%` sign.
 For more detail see `man 3 strftime` as the format specifiers should behave
 identically. If behaviour differs please [file a bug](https://github.com/samsonjs/strftime/issues/new).
 
-Any specifier can be modified with `-`, `_`, or `0` as well, as in Ruby.
+Any specifier can be modified with `-`, `_`, `0`, or `:` as well, as in Ruby.
 Using `%-` will omit any leading zeroes or spaces, `%_` will force spaces
 for padding instead of the default, and `%0` will force zeroes for padding.
 There's some redundancy here as `%-d` and `%e` have the same result, but it
-solves some awkwardness with formats like `%l`.
+solves some awkwardness with formats like `%l`. Using `%:` for time zone offset,
+as in `%:z` will insert a colon as a delimiter.
 
 Contributors
 ============
 
 * [Rob Colburn](https://github.com/robcolburn)
+* [Cory Heslip](https://github.com/cheslip)
 * [Alexandr Nikitin](https://github.com/alexandrnikitin)
 * [Sami Samhuri](https://github.com/samsonjs)
 * [Andrew Schaaf](https://github.com/andrewschaaf)
diff --git a/bower.json b/bower.json
index 8ed1185..ea48f3b 100644
--- a/bower.json
+++ b/bower.json
@@ -1,11 +1,11 @@
 {
   "name": "strftime",
-  "version": "0.8.2",
+  "version": "0.8.3",
   "main": "strftime.js",
   "ignore": [
     "Readme.md",
     "Makefile",
-    "test/*",
+    "test",
     "*.json"
   ],
   "dependencies": {},
diff --git a/strftime.js b/strftime.js
index 2c726d4..bed30ae 100644
--- a/strftime.js
+++ b/strftime.js
@@ -131,7 +131,8 @@
             var resultString = '',
                 padding = null,
                 isInScope = false,
-                length = format.length;
+                length = format.length,
+                extendedTZ = false;
 
             for (var i = 0; i < length; i++) {
 
@@ -153,6 +154,11 @@
                         padding = '0';
                         continue;
                     }
+                    // ':'
+                    else if (currentCharCode === 58) {
+                      extendedTZ = true;
+                      continue;
+                    }
 
                     switch (currentCharCode) {
 
@@ -297,10 +303,10 @@
                             resultString += padTill2(date.getDate(), padding);
                             break;
 
-                        // '01'
+                        // ' 1'
                         // case 'e':
                         case 101:
-                            resultString += date.getDate();
+                            resultString += padTill2(date.getDate(), padding == null ? ' ' : padding);
                             break;
 
                         // 'Jan'
@@ -378,7 +384,7 @@
                             resultString += day === 0 ? 7 : day;
                             break; // 1 - 7, Monday is first day of the week
 
-                        // '1-Jan-1970'
+                        // ' 1-Jan-1970'
                         // case 'v':
                         case 118:
                             resultString += _processFormat(locale.formats.v, date, locale, timestamp);
@@ -406,17 +412,21 @@
                         // case 'z':
                         case 122:
                             if (_useUtcBasedDate && _customTimezoneOffset === 0) {
-                                resultString += "+0000";
+                                resultString += extendedTZ ? "+00:00" : "+0000";
                             }
                             else {
                                 var off;
-                                if(_customTimezoneOffset !== 0) {
+                                if (_customTimezoneOffset !== 0) {
                                     off = _customTimezoneOffset / (60 * 1000);
                                 }
                                 else {
                                     off = -date.getTimezoneOffset();
                                 }
-                                resultString += (off < 0 ? '-' : '+') + padTill2(Math.floor(Math.abs(off / 60))) + padTill2(Math.abs(off % 60));
+                                var sign = off < 0 ? '-' : '+';
+                                var sep = extendedTZ ? ':' : '';
+                                var hours = Math.floor(Math.abs(off / 60));
+                                var mins = Math.abs(off % 60);
+                                resultString += sign + padTill2(hours) + sep + padTill2(mins);
                             }
                             break;
 
diff --git a/test/test.js b/test/test.js
index d212402..f26d137 100755
--- a/test/test.js
+++ b/test/test.js
@@ -74,7 +74,7 @@ assert.format('%d', '07');
 assert.format('%-d', '7');
 assert.format('%_d', ' 7');
 assert.format('%0d', '07');
-assert.format('%e', '7');
+assert.format('%e', ' 7');
 assert.format('%F', '2011-06-07');
 assert.format('%H', null, '18');
 assert.format('%h', 'Jun');
@@ -104,7 +104,7 @@ assert.format('%t', '\t');
 assert.format('%U', '23');
 assert.format('%U', '24', null, new Date(+Time + 5 * 86400000));
 assert.format('%u', '2');
-assert.format('%v', '7-Jun-2011');
+assert.format('%v', ' 7-Jun-2011');
 assert.format('%W', '23');
 assert.format('%W', '23', null, new Date(+Time + 5 * 86400000));
 assert.format('%w', '2');
@@ -112,7 +112,9 @@ assert.format('%Y', '2011');
 assert.format('%y', '11');
 assert.format('%Z', null, 'GMT');
 assert.format('%z', null, '+0000');
+assert.format('%:z', null, '+00:00');
 assert.format('%%', '%'); // any other char
+assert.format('%F %T', null, '1970-01-01 00:00:00', new Date(0));
 ok('GMT');
 
 
@@ -159,7 +161,7 @@ assert.format_it('%P', null, 'it$pm');
 assert.format_it('%R', null, 'it$18:51');
 assert.format_it('%r', null, 'it$06:51:45 it$PM');
 assert.format_it('%T', null, 'it$18:51:45');
-assert.format_it('%v', 'it$7-giu-2011');
+assert.format_it('%v', 'it$ 7-giu-2011');
 assert.format_it('%x', null, 'it$06/07/11');
 assert.format_it('%X', null, 'it$18:51:45');
 ok('Localization');
@@ -178,6 +180,7 @@ assert.formatTZ('%F %r %z', '2011-06-07 08:51:45 PM +0200', '+0200');
 assert.formatTZ('%F %r %z', '2011-06-07 11:51:45 AM -0700', -420);
 assert.formatTZ('%F %r %z', '2011-06-07 11:51:45 AM -0700', '-0700');
 assert.formatTZ('%F %r %z', '2011-06-07 11:21:45 AM -0730', '-0730');
+assert.formatTZ('%F %r %:z', '2011-06-07 11:21:45 AM -07:30', '-0730');
 ok('Time zone offset');
 
 
@@ -224,5 +227,6 @@ function testTimezone(regex) {
         assert.format('%T', T, '18:51:45');
         assert.format('%Z', tz, 'GMT');
         assert.format('%z', sign + '0' + Math.abs(hourDiff) + '00', '+0000');
+        assert.format('%:z', sign + '0' + Math.abs(hourDiff) + ':00', '+00:00');
     }
 }