diff --git a/website/source/docs/templates/configuration-templates.html.markdown b/website/source/docs/templates/configuration-templates.html.markdown
index f2c42c2fb..5bb1e823e 100644
--- a/website/source/docs/templates/configuration-templates.html.markdown
+++ b/website/source/docs/templates/configuration-templates.html.markdown
@@ -55,9 +55,62 @@ in Packer templates. These are listed below for reference.
* `pwd` - The working directory while executing Packer.
* `isotime` - UTC time in RFC-3339 format.
+* isotime `<format>` - UTC time in [<format>](http://golang.org/pkg/time/#example_Time_Format) format.
* `timestamp` - The current Unix timestamp in UTC.
* `uuid` - Returns a random UUID.
+### isotime Format
+Formatting for the function isotime `<format>` uses the magic reference date **Mon Jan 2 15:04:05 -0700 MST 2006**, which breaks down to the following:
+
+
+
+ |
+ Day of Week |
+ Month |
+ Date |
+ Hour |
+ Minute |
+ Second |
+ Year |
+ Timezone |
+
+
+ | Numeric |
+ - |
+ 01 |
+ 02 |
+ 03 (15) |
+ 04 |
+ 05 |
+ 06 |
+ -0700 |
+
+
+ | Textual |
+ Monday (Mon) |
+ January (Jan) |
+ - |
+ - |
+ - |
+ - |
+ - |
+ MST |
+
+
+ _The values in parentheses are the abbreviated, or 24-hour clock values_
+
+ Here are some example formated time, using the above format options:
+
+
+isotime = June 7, 7:22:43pm 2014
+
+{{isotime "2006-01-02"}} = 2014-06-07
+{{isotime "Mon 1506"}} = Sat 1914
+{{isotime "01-Jan-06 03\_04\_05"}} = 07-Jun-2014 07\_22\_43
+{{isotime "Hour15Year200603"}} = Hour19Year201407
+
+
+
## Amazon Specific Functions
Specific to Amazon builders: