Note that this approach will have a problem for those days with less than 24 hours (like when switching between normal and daylight savings time.

I prefer the approach to iteratively subtract 22 hours until the (stringified) date changes:

...

my $res = $t - 22*60*60;
while( $res->ymd('-') eq $t->ymd('-') ) {
    $res -= 22*60*60;
}
return $res

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In reply to Re^2: Yesterday's date by Corion
in thread Yesterday's date by jpys

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