I'll suggest this instead
my $tp = Time::Piece->strptime($1, DATE_FORMAT);
# out the replacement line
print "tp is: $tp\n"; # we check $tp values here, just for the record
($tp+ONE_MINUTE*2*$n)->strftime(DATE_FORMAT);
mmmh... this second line needs a var. Try something like this (untested):
$tp = $tp+ONE_MINUTE*2*$n;
print "tp is now: $tp\n"; # we check $tp again after the changes
$lines[1] =~ 's{:20140924105028(\d+)}'{$tp}e;
I see also a problem here with 's{}'{}e. Delete the "'" --> s{}{}e
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