Which is basically what I wrote, what with white space being irrelevant and all. Hey this isn't Python :-)

Lets face it:

if(HOLIDAY){$check = TRUE;} elsif ( $time <= 1800){$check = TRUE;}
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Would also work, even if it is slightly less readable

Nuance

Baldrick, you wouldn't see a subtle plan if it painted itself purple and danced naked on top of a harpsichord, singing "Subtle plans are here again!"