So, I've had a programming task to do on TCL that involves things that I don't normally use. This one was basically to take the first Sunday of a specific Month and Year. After some time of researching and testing, I figured it out. This entry is just for archival purposes.
% clock format [clock scan {Sunday} -base [clock scan "2013-05-01" -format {%Y-%m-%d}] -format {%A}] -format {%Y-%m-%d}
Base sets the base time for clock and the format for the return can be tweaked to whatever you want. It's also worth taking note that -format parameter on clock scan only works on TCL 8.5 and above.
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