Add section on Dates and Times (moment.js + mmm format)

Author: Zach Bagnall

README.md

@@ -8,6 +8,7 @@
 ## Table of Contents
 
   1. [Types](#types)
+  1. [Dates and times](#datetimes)
   1. [Objects](#objects)
   1. [Arrays](#arrays)
   1. [Strings](#strings)
@@ -74,6 +75,14 @@
 
 **[⬆ back to top](#table-of-contents)**
 
+## Dates and times
+
+  - **Thou shalt use [moment.j](http://momentjs.com/)s**: because it does common stuff sensibly including formatting, parsing and edge cases like DST.
+
+  - **Thou shalt not output numeric months** (unless preceded by year) because [it is easily confused](http://metabroadcast.com/blog/dd-mm-yyyy-is-evil) with day. Use `mmm` instead.
+
+**[⬆ back to top](#table-of-contents)**
+
 ## Objects
 
   - Use the literal syntax for object creation.