Why not fix the time unconditionally?

sub fix_time {
    my( $time )= @_;
    $time =~ s/^(\d:\d\d)$/0$1/;
    return $time
};

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This replaces (if it finds) the leading single-digit number with a zero-padded number.

In reply to Re: Parsing a date time string by Corion
in thread Parsing a date time string by bangor

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