Date Time Php

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  4. Format Characters Used by the strftime() Function for Week
Character Description 
%U        Number of the week of the year, with Sunday as the first day of the week. 
%V        ISO-8601 number of the week of the year, with Monday as the first day of the week (01–53). 
%W        Number of the week of the year, with Monday as the first day of the week (decimal number).