Basic Trope: An event caused the calendar to reset to Year 0.
- Straight: Hiro and the Five-Man Band have defeated Emperor Evulz and set the year they overthrow The Empire as Year 0.
- Exaggerated:
- Every single dawn resets the date to Day 0, 1st month of Year 0000, because every day of the year is someone's birthday.
- Hiro and the Five-Man Band also have every month of the year renamed from after Evulz's inner circle to after themselves.
- Downplayed: Hiro and his Five-Man Band defeat Evulz and write him and his regime out of their history by resetting the calendar to the day he took power.
- Justified:
- The new Powers That Be want to make a clean break with the past.
- The Empire has a Pontifex Maximus type of position that's supposed to keep the Imperial calendar in sync by manually adding extra days. After defeating Evulz, Hiro transforms the Imperial Calendar into the Hiroan Calendar through automating the intercalation to limit the calendar-keeper's power.
- Inverted: The society learns about an ancient event before their calendar's year zero and used that year as year zero, pushing the date hundreds if not thousands of years bigger.
- Subverted: Everybody expects the new government to change the calendar to Year 0, but they announce that they will not do so.
- Double Subverted: ...Because they want to get a handle on the nuts and bolts of governing well first. Once they're secure in power, then they'll move towards changing the calendar.
- Parodied: Everybody in Tropeland is unexpectedly ready for this to happen, with every household having at least one of the 14 types of calendars for year zeronote available at a moment's notice, but it never happens.
- Zig-Zagged: After Hiro helps establish The Republic, the new government denotes the year as Year 0. Then a splinter group opposed to this change takes over and puts the calendar back to the former year. Then somebody else proposes restarting timekeeping at the mathematical midpoint between "day one of year zero" and what it would be under this notation.
- Averted: There are no momentous occasions.
- Enforced:
- It's set in a Fantasy Counterpart Culture of post-revolutionary France.
- In a long-running franchise, the official timeline has become so complicated that the executives decide to declare the latest installment the new year zero.
- Lampshaded: "So, after you defeated Evulz, you decided to defeat the calendar next?"
- Invoked: ???
- Exploited: ???
- Defied: Tropeland's top Badass Bureaucrat says, "You may have won a war, Hiro, but you're not going to change how we keep track of time." And in case Hiro tries to be adamant about invoking this trope, said Badass Bureaucrat proceeds to show off the entirety of Tropeland's elite special forces, with each soldier being able to easily wipe out Hiro and his gang without even breaking a sweat.
- Implied: Dates are given as Book Ends to the film, which is explicitly stated to be in chronological order, and the end date is earlier than the first.
- Discussed: ???
- Conversed: ???
- Deconstructed: ???
- Reconstructed: ???
- Played for Laughs: Bob the programmer is distraught as many massive upheavals not because of the changes or instability but because it will be a pain in the ass to change all of the time libraries to deal with the new formats.
- Played for Drama: ???
Back to Hit So Hard, the Calendar Felt It
