The zero was dropped on the conversion from string to int - a leading zero on an int actually means octal. To put it back use sprintf or printf with a format of something like %04s. For example: 
printf STDOUT "former_time is %04d\n", $former_time;

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Update: And:
my $new_time = sprintf("%02d%02d", $new_hour, $new_mn);

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In reply to Re: problem of configration by cdarke
in thread problem of configration by steph_bow

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