Vis kilden til Mal:Get year

<includeonly>{{#ifeq:"{{lc:{{{1|1900}}}}}"|"{{Four digit|{{#expr:{{{1|1900}}}}}}}"|{{{1|1900}}}|{{#time:Y|{{{1|November 1, 1900}}} }}}}</includeonly><noinclude>
'''Purpose''': Given a plain text date, returns the year.  accepts ISO8601, a variety of date formats as well as year only specification of date.  

Limitatins: does understand BC/ AD and may not deliver accurate results for single digit dates.

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