History Main / HitSoHardTheCalendarFeltIt

It's TheEndOfTheWorldAsWeKnowIt, and TheEndOfTheBeginning as well. Either the few remnants of sentient life (we're talking [[ApocalypseHow either Class 1 or 2]] here) are rebuilding, or some [[RealityWarper Reality Alterating Event]] has taken place which reshapes their entire conception of History. In any case, they see fit to reset the calendar and set civilization's New Beginning as year 1 or year 0.

* The "[[UltimateUniverse Ultimatized]]" Marvel2099 seen in ''Timestorm 2009-2099'' includes a brief scene set some years earlier with a holographic teacher modeled on Reed Richards explaining that it probably isn't ''really'' 2085 because they started counting again from the last date ''before'' the disaster.

* The "[[UltimateUniverse Ultimatized'' Marvel2099 seen in ''Timestorm 2009-2099'' includes a brief scene set some years earlier with a holographic teacher modeled on Reed Richards explaining that it probably isn't ''really'' 2085 because they started counting again from the last date ''before'' the disaster.

Can also be revealed to have happened in retrospect as a WorldBuilding trope - the event after which a soceity dates its calendar tells you something about their culture.

** It was changed in the 2nd century B.C. in order to allow the newly-elected consuls to be ready for battle by the start of the campaigning season (spring).

* In ''TheBelgaraid'' and its sequel, ''The Mallorean'', the calendar used dates the year 0 to be when the evil god Torak cracked the world. This particular calendar is referred to as the Alorn calender, implying that other nations may have different systems.

** Averted in Gundam00, which is the only series to us the Christian "AD" dating system common today.
** Lampshaded with the CE acronym above, since the secular acronym common today is CE, albeit with a different word for the C.[[hottip:* : Common, not cosmic, if you must know.]]

* One of the proofs that the Holy Britannian Empire being ''the'' most dominant force on Earth in CodeGeass universe, the calendar doesn't follow the real world AD/CE, instead, we have A.T.B, for "Ascension to Throne, Britannia". This roughly coincides with about -60 BC, when the in-universe history diverges (the reason being that Julius Caesar never conquered Britain; the Anglo-Saxons elected a "super leader" to fight him instead and won, amongst all the historical variance in that universe which included a failed American Revolution and a change of seat of power from mainland Britain to American Colonies).

* The [[AncientRome ancient Romans]] dated their calendar from the foundation of the city of Rome -- ''ab urbe condita'' or A.V.C.. Their original calendar divided the year into ten months: ''Martius'' (Mars(=Ares)'s (Mars being the god of war ''and'' farming, activities beginning in the spring)), ''Aprilis'' (Opening, ''i.e.'' of buds), ''Maius'' (Maia (a fertility goddess)'s), ''Iunius'' (Juno(=Hera)'s),[[hottip:* :the rest show a distinct lack of imagination]] ''Quintilis'' (Fifth), ''Sextilis'' (Sixth), ''September'' (Seventh), ''October'' (Eighth), ''November'' (Ninth), and ''December'' (Tenth). When the ten month calendar proved unworkable, two new months were added at the beginning, ''Ianuarius'' (Opening or Janus's) and ''Februarius'' (Purification, referring to a winter festival); no attempt seems to have been made to re-name the now mis-numbered later months, except that JuliusCaesar, when reforming the calendar (and naming the whole system after himself) renamed ''Quintilis'', the month in which he had been born, ''Iulius'' after himself, and Augustus renamed the following month (in which he was ''not'' born) ''Augustus'' after himself.

FIt's TheEndOfTheWorldAsWeKnowIt, and TheEndOfTheBeginning as well. Either the few remnants of sentient life (we're talking [[ApocalypseHow either Class 1 or 2]] here) are rebuilding, or some [[RealityWarper Reality Alterating Event]] has taken place which reshapes their entire conception of History. In any case, they see fit to reset the calendar and set civilization's New Beginning as year 1 or year 0.

It's TheEndOfTheWorldAsWeKnowIt, and TheEndOfTheBeginning as well. Either the few remnants of sentient life (we're talking [[ApocalypseHow either Class 1 or 2]] here) are rebuilding, or some [[RealityWarper Reality Alterating Event]] has taken place which reshapes their entire conception of History. In any case, they see fit to reset the calendar and set civilization's New Beginning as year 1 or year 0.

* After the FrenchRevolution, not only did they restart the calendar, they made up an entire new month/week/day system. [[{{Understatement}} Didn't catch on.]] This was actually a little odd, as nearly every other unit the French revolutionaries came up with did catch on (they are collectively now known as the metric system). Probably metric time didn't catch on because it was by far the most complex system of units, as well as being by far the most tied to revolutionary France.

** Renaming the months initially would have confused the Romany anyway, as martius remained the first month of the year, ending it in februarius. Is was wquite some time later that the beginning of the year was shiftes around.

* The ''{{Dune}}'' books did something analogous, resetting the calendar when the Spacing Guild established its monopoly (which was about 108 years after what might have been regarded as the apocalypse — the end of the Butlerian Jihad).

* The ''{{Dune}}'' books did something analogous, resetting the calendar when the Spacing Guild established its monopoly (which was about 108 years after what might have been regarded as the apocalypse — the end of the Butlerian Jihad).

* Endemic to the {{Gundam}} series, which has mankind switching to UC[[hottip:* : Universal Century]], AC[[hottip:* : After Colony]], FC[[hottip:* : Future Century]], AW[[hottip:* : After War]], CC[[hottip:* : Correct Century]], and CE[[hottip:* : Cosmic Era]] in various timelines. According to [[TurnAGundam Correct Century]] timeline, all these calendar changes happened ''in one timeline'' with mankind changing the dating system every time they blew up all their space colonies and sent out new ones.

* In ''StarWars'', time is divided into BBY and ABY, before and after the Battle of Yavin (wherein the Death Star was destroyed).

* After the FrenchRevolution, not only did they restart the calendar, they made up an entire new month/week/day system. [[{{Understatement}} Didn't catch on.]]