in reply to How do I find the difference in days between two dates, in a cool perl way?

Use the utc_rd_values method in DateTime to get the day number of the date you're looking at: 
my @start = $dt1->utc_rd_values;
my @finish = $dt2->utc_rd_values;
my $delta = $finish[0] - $start[0];

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Now $delta contains the number of days between the two dates.

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