Calendars: A.D B.C app for iPhone and iPad

The history of the calendars, calendar differences between ancient areas, before A.D & B.C.
*Calendar History*
*Chronology*
*Prehistoric Chronologies*
*Gregorian Calendar*
*Egyptian Calendar*
*Lunar Calendar*
*Anno Domini*
*AD - BC*
*Adoption In Europe*
*Adoption In Eastern Asia*
*Adoption Orthodox*
*Present Situation*
*Change Of The Year*
*History Birth Date Of Jesus*
*Other Eras*
*CE And BCE*
*No Year Zero*
*Proposed Reforms*
*Popularization*
*Ab Urbe Condita Era*
*Astronomical Era*
*Related Fields*
*Timeline*
*Difference between Gregorian and Julian Calendar dates*