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The week number can be described by counting the Thursdays: week 12 co +ntains the 12th Thursday of the year. ... Monday 29 December 2008 is written "2009-W01-1" Sunday 3 January 2010 is written "2009-W53-7"
#!/usr/bin/perl use strict; ... $ perl test.pl 2016010100:00:00 2015-W53-5