Try the Date::Manip module: 

use Date::Manip::Date; 
my $base = Date::Manip::Date->new; 
for my $deltastr ("32:05", "11:32:05") { 
   $delta = $base->new_delta($deltastr); 
   $deltasec = $delta->printf("%sys"); 
   print "$deltastr => $deltasec s\n"; 
}

=begin output

32:05 => 1925 s
11:32:05 => 41525 s

=end output

=cut

[download]

Update: this is incorrect, for it doesn't work for times greater than a day that ps outputs, eg. "35-04:04:09". I guess there's no simpler workaround other than separating the fields (or at least the day field) manually using a regex.

In reply to Re: A regular expression that will work for (hh:)mm:ss [converting clock time to seconds] by ambrus
in thread A regular expression that will work for (hh:)mm:ss [converting clock time to seconds] by aware74

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