All UI activity in Tk occurs in the Tk event loop. You are exiting the program from an event handler before returning control to the event loop. Try replacing that handler with sub {&checkDays; $mw->after(5000, sub {exit(0)});} and see Tk::after for more details.

In reply to Re^3: Perl/Tk and exit(0) by jcb
in thread Perl/Tk and exit(0) by saw55

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