You could convert to seconds and use the result for your calculations. The conversion is straightforward: 

my ($h, $m, $s) = split /:/, $time;
my $time_in_secs = $h * 60 * 60 + $m * 60 * $s;

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Regards,

PN5

In reply to Re: time difference in milliseconds by Prior Nacre V
in thread time difference in milliseconds by Anonymous Monk

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