It accepts both.

Yes, davorg also pointed out my error. I had always thought that localtime() and timelocal() were essentially mirrors of each other. Now I know better. Re. your habitual $m-1, that's very sound reasoning; perhaps I should do the same.

I saw davorg's reply to my post just as I was leaving work so I didn't have time to correct my error. I will do so now.

Cheers,

JohnGG