Time & Calendars Index

Calendars
- Chinese
- Chinese and Japanese Old Solar
- Ethiopian
- French Republican
- Gregorian
  - Gregorian
  - adoption of the Gregorian calendar
  - eras in use with the Gregorian calendar
  - old style dates (writing English dates prior to adoption of the Gregorian calendar)
- Hebrew
- Islamic
- Iranian
- Japanese
- Julian
- Mayan
- Roman
Chronologies
- Achaemenid Empire
- Byzantium, emperors
- Caliphs
- China, dynasties
- Denmark, kings
- Dublin, kings
- England, kings and queens
- England, York, kings
- Great Britain, kings and queens
- Hawaii, Kings and Queens
- Hlaðir, jarls
- Holy Roman emperors
- Japan, emperors
- Japan, shoguns
- Japan, conventional periods
- Kievan Rus, princes
- Korea, dynasties
- Malta, Grandmasters of the Knights of St. John
- Man and the Isles, kings and lords
- Moldova
- Normandy, dukes
- Norway, kings
- Orkney, earls
- Popes
- Rome, emperors
- Ryukyu Islands, dynasties
- Sweden, kings of the Svear
- United States, administrations
- Wallachia
Eras
- Christian era (ad, anno domini)
- Ethiopian
- Islamic era (ah, anno hegira)
- Hebrew era (am, anno mundi)
- Seleucid
- eras in use with the Gregorian calendar
Divisions of the day
- ships' watches
- twilight
- ghaḷige [Kannada]
- ghaṛi [Bengali, Marathi]
- ghaṭika [Telugu]
- ghurry
- godhúl
- canonical hours
- yama
Units, periods, etc. a solar day or less
- bipal
- chu srang
- chu tshod
- daṇḍa
- dbug
- dbyug gu
- decimal time units
- dinati
- day
  - day
  - Chinese double hours
  - Julian day number
  - tabular
- ghaṭikā
- glass
- inch of candle
- litya
- moment
- nāḍī
- noḍi [Tamil, Malayalam]
- pāṇīpala
- Planck time
- rising and setting of stars
- sa-pěrpisang
- second
- śvāsa
- ships' bells
- vipala
Units, periods, counts, etc. ≤ a year
- annus
- Bartel's rotation number
- broken days
- cohonk
- week
- month
- moon stations
- ráithe
- year
- numbering of weeks in a year
- date on which a new year begins
Units, periods, counts, etc. > a year
Time scales
- atomic time (TAI)
- daylight saving time (summer time)
- ephemeris time
- coordinated universal time (UTC)
Time zones
- Africa
- Asia
- Central America & the Caribbean
- Europe
- Middle East
- North America
- Pacific
- South America
- United States