Getting uninitialized value error from timelocal function

[begood321]

Hi guys I can't seem to figure out why my code is complaining below even though I initialize variable:

Use of uninitialized value in subtraction (-) at C:\Temp\users_log2.pl line 225 (#1)

Syntax check is okay. Hence it appears from error I get some correct values but not all.

Here is the block of code where issue occurs:

# search file one line at a time to locate target string
foreach my $line (@file) {
	$ctr++;

	chomp $line; # remove carriage return line feed

	$line =~ s|.*\s+\w+\s||; # remove all characters prior in target string	
	$line =~ s|\s+$||;	# remove extra spaces at end of line
	
	if ($line =~ m|-0|) { # remove leading 0 from day
		$line =~ s|0||;
	}

	my $teamsite_user_access_date = $line;
	
	# Convert dates and times into seconds since epoch
	my ($mon, $mday, $year) = split(/-/, $teamsite_user_access_date);
	
	my $teamsite_user_access_date_epoch = 0;
	eval {
	  $teamsite_user_access_date_epoch = timelocal(0,0,0,$mday,$mon-1,$year); # set teamsite user access date to numeric value
	};	
	
	# calculate days of teamsite user access
	my $result = ($tod_date_epoch - $teamsite_user_access_date_epoch) / $day_sec;
	
	# ###### print lines with dates >= 90 days ##### 	
	if ($result >= 90)
	{
		print MYFILE "teamsite_user_access >= 90 days: $teamsite_user_access_date\n\n\n";
	}
}

Here is the actual line where the code complains:

$teamsite_user_access_date_epoch = timelocal(0,0,0,$mday,$mon-1,$year); # set teamsite user access date to numeric value

Just posting problem section for now because entire code is 238 lines. Hope someone can help me here. Thanks