• Gregorian calendar
  Wikipedia, the free encyclopedia
  By chr in misc with calendar gregorian reform wikipedia by 2 users
• Calendrica
  Webanwendung zur Umrechnung zwischen Kalendersystemen
  By Netpilgrim in Public bookmarks with calendar gregorian julian software system webbased
• Date::Pcalc - Gregorian calendar date calculations - search.cpan.org
  By mepage in Development > Projects > LessonPlannner with calculations calendar date development gregorian lessonplannner pcalc projects

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