I searched the date::manip source for [a-z] and found a lot of hits.

Good point. I did some more digging myself, and it appears to be a bug in Date::Manip. There is some replacement magic going on to allow the use of "m" in place of "Monat"... 

    # Check for some special types of dates (next, prev)
    foreach $from (keys %{ $Lang{$L}{"Repl"} }) {
      $to=$Lang{$L}{"Repl"}{$from};
      s/(^|[^a-z])$from($|[^a-z])/$1$to$2/i;
    }

[download]

As you correctly observed, this is (one place) using the charset [^a-z] to delimit tokens. The net effect of this is that "Mär" ends up as "Monatär" at this stage, which then cannot be parsed properly any further...

Substituting [^a-z\xe4] (for testing purposes) fixes the issue with "Mär", but a proper solution would of course have to dynamically construct the correct character set depending on the language being selected...

I'll submit a bug report.   (Update: done)

For the moment, I can live with just disabling that curious "m" => "Monat" mapping feature as follows — in _Date_Init_German(): 

  ...
  #$$d{"replace"} =["m","Monat"];
  $$d{"replace"} =[];

[download]

In reply to Re^2: Date::Manip and German months names (solved) by almut
in thread Date::Manip and German months names by almut

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