Need for more date formats

As [this article](http://www.englishlessonsbrighton.co.uk/how-to-write-dates-british-american-english/) suggests (http://www.englishlessonsbrighton.co.uk/how-to-write-dates-british-american-english/) there is need for more date formats in drop-down menu in Configuration - System section of admin panel.

Writing Dates in British English
- 13 April
- 13 April 2014
- 13th April 2014
- the 13th of April 2014
- the 13th of April, 2014
- Sunday, 13 April 2014
- Sunday the 13th of April, 2014

Writing Dates in American English
- April 13
- April 13, 2014
- Sunday, April 13, 2014

April the 13th or April 13th are not incorrect, but are much less common now.

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British Abbreviated Dates
- 13/04/14, 13.04.14, 13-04-14
- 13/04/2014, 13.04.2014, 13-04-2014
- 13Apr2014, 13-Apr-14

American Abbreviated Dates
- 04/13/14, 04.13.14, 04-13-14
- 04/13/2014, 04.13.2014, 04-13-2014
- Apr. 13, 2014

Start in the admin panel's Configuration - System section and inspect how the date-format drop-down is populated. Compare its available choices with the British and American formats listed in the issue; done means the requested formats can be selected there.

Written by the indexing model from the issue text.