Gregorian calendar Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.Anti-spam check. Do not fill this in! ==See also== {{Portal|Christianity}} *[[Calendar (New Style) Act 1750]] *[[Calendar reform]] *[[Conversion between Julian and Gregorian calendars]] *[[Doomsday rule]] *[[French revolutionary calendar]] *[[Hebrew calendar]] *[[Dionysius Exiguus]] *[[s:Translation:Inter gravissimas|Inter gravissimas in English]] – Wikisource *[[Julian day]] *[[History of calendars]] * [[ISO 8601]], an international standard for the representation of dates and times, which uses the Gregorian calendar (see Section 3.2.1). *[[List of adoption dates of the Gregorian calendar by country]] *[[List of calendars]] *[[Old Calendarists]] **[[Greek Old Calendarists]] *[[Revised Julian calendar]] (Milanković) – used in Eastern Orthodoxy '''Precursors of the Gregorian reform''' * [[Johannes de Sacrobosco]], ''De Anni Ratione'' ("On reckoning the years"), {{Circa|1235}} * [[Roger Bacon]], {{Lang|la|[[Opus Majus]]}} ("Greater Work"), {{Circa|1267}} Summary: Please note that all contributions to Christianpedia may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here. You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see Christianpedia:Copyrights for details). Do not submit copyrighted work without permission! Cancel Editing help (opens in new window) Discuss this page