Format JavaScript Date Strings – format-date
format-date is a super tiny (~0.4kb) JavaScript library to format JavaScript date() strings using custom Date and Time patterns.
JavaScript & CSS date format
Parse And Format Datetime Strings Using PHP DateTime Formats
A tiny JavaScript DateTime manipulation library to parse and format DateTime strings using PHP Date and Time formats.
Lightweight Datetime Formatter In JavaScript – tinydate
tinydate is an extremely lightweight (0.3 kb minified) JavaScript library used for formatting date/time strings using pure JavaScript.