timrwood/moment — pull request #373 by jasondavies (2012-07-25 18:01:58+00:00)
Title: Add support for years outside 0000-9999.

It seems reasonable to support all the dates that JavaScript's Date can support. However, extending the existing YYYY format specifier to include 6-digit dates (and negative dates) will break when there are no separators, e.g. it would incorrectly attempt to parse 12345678/YYYYMMDD as the year 123456.