While embedded spaces in your filenames are acceptable, you cannot normally have a colon in your filename in Windows. There used to be shennanigans you could use to force them in, but normal usage of opendoes not include this.

You can fabricate a slightly cleaner filename:

    my $logFile = "C:\\Test\\Data\\Mytime1:00:34 AM";

    my ($logDrive, $logFilebase) = split /\:/, $logFile, 2;
    $logFilebase =~ s/[\:\>\<\|\s]+/\_/g;
    my $cleanLogFile = "$logDrive\:$logFilebase";

    print "     \$logFile: [$logFile]\n";
    print "\$cleanLogFile: [$cleanLogFile]\n";
[download]

Results:

D:\PerlMonks>\steve\t\t22.pl
     $logFile: [C:\Test\Data\Mytime1:00:34 AM]
$cleanLogFile: [C:\Test\Data\Mytime1_00_34_AM]
[download]

Update: Definite ++to 1nickt for the use of standard module for date/time consistency, as well as the universal format. You'll still need to filter out or convert the colons.