Thanks, but how to get a desired date string was not my question. I was wondering if anybody could help me understand the difference in behavior between two platforms.

I believe japhy's solution suggested that taking the lowercase of the string, made some difference in some systems that either ignore case, or make a big deal of it. Like the difference between old windows and a unix system. I thought I would just point that out. There may be a subtle difference, which you may be overlooking.

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I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh