Hi tsdesai

I am trying to count days between two dates ...

You can use DateTime's delta_days() method for this.

$ perl -Mwarnings -Mstrict -ML -E'
my $parser = DateTime::Format::Strptime->new(pattern => "%Y%m%d%H:%M:%
+S", on_error => "croak");
my $dt1 = $parser->parse_datetime("2016080100:00:00");
my $dt2 = $parser->parse_datetime("2016123100:00:00");
say $dt2->delta_days( $dt1 )->in_units("days");
'
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Output:

152
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[ Note that you still have to use in_units() because delta_days() returns a DateTime::Duration object (with all values rolled into a whole number of days). ]

Hope this helps!