$file1 = 'C:\baz1.txt';
$file2 = 'C:\bar1.txt';

if (-M $file1 < -M $file2) {
     print "baz is newer than bar";
} elsif (-M $file1 > -M $file2) {
     print "bar is newer than baz";
} elsif (-M $file1 == -M $file2) {
     print "bar and baz are equal";
} else {
     print "foo, that didn't go well!";
}