use strict;
use Date::Calc qw(check_date check_time);

=head1 Date::Calc functions
if (check_date($year,$month,$day)) 

This function returns "true" ("1") if the given three numerical values "$year", "$month" and "$day" constitute a valid date, and "false" ("0") otherwise. 

if (check_time($hour,$min,$sec)) 

This function returns "true" ("1") if the given three numerical values "$hour", "$min" and "$sec" constitute a valid time (0 <= $hour < 24, 0 <= $min < 60 and 0 <= $sec < 60), and "false" ("0") otherwise. 

=cut
# test routine
while (<DATA>){
  chomp;
  my $ok = check($_) ? "valid" : "NOT valid";
  print "$_ is $ok\n";
}

# check valid date time YYYY-MM-DD hh:mm:ss
sub check {
  my $dt = shift;
  if ($dt =~ m!^(\d{4})-(\d\d)-(\d\d) (\d\d):(\d\d):(\d\d)$!){
    return ( check_date($1,$2,$3) && check_time($4,$5,$6) );
  } else {
    return 0;
  }
}

__DATA__
2001-01-01 12:12:12
2001-02-29 12:12:12
2004-02-29 12:12:12
2001-01-01 25:12:12
2001-01-01 12:61:12
2001-01-01 12:12:61
01-01-2001 12:12:12