Nice and concice. If the poster meant "in the last 24 hours" to mean this calendar day, let's combine this concise answer with some of the others above:
if ( 1 > -M $file and
(localtime((stat _)[9]))[3] == (localtime)[3] ) {
# modified "in the last 24 hours"
}
Beware of small, subtle bugs around Daylight Savings time.
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