I love Friday. Please tell me whether the day is Friday.
Dateformat is 'yyyy-mm-dd' or 'dd-mmm-yyyy' or 'mm/dd/yyyy'.
Examples;
input D = '2018-01-03'; % Wednesday
output y = 0
input D = '5-Jan-2018'; % Friday
output y = 1
input D = '09/09/2019'; % Monday
output y = 0
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