WikiBugs/TranslationMonthNames

sub CalcDay { ...

    return ($year + 1900) . '-' . ($mon+1) . '-' . $mday;
  }
-  return ("January", "February", "March", "April", "May", "June",
-          "July", "August", "September", "October", "November",
-          "December")[$mon]. " " . $mday . ", " . ($year+1900);
+  return (T('January'), T('February'), T('March'), T('April'), T('May'), T('June'),
+          T('July'), T('August'), T('September'), T('October'), T('November'),
+          T('December')[$mon]. " " . $mday . ", " . ($year+1900);

}

See also: WikiBugs/MonthsInEnglish. Rejected/Fixed (from 0.92): Workaround--numeric dates.

--JuanmaMP