Time measurement and standards | |
|---|---|
| Major subjects | |
| International standards | UTC · UTC offset · UT · ΔT · DUT1 · IERS · ISO 31-1 · ISO 8601 · TAI · 12-hour clock · 24-hour clock · Barycentric Coordinate Time · Civil time · Daylight saving time · Geocentric Coordinate Time · International Date Line · Leap second · Solar time · Terrestrial Time · Time zone |
| Obsolete standards | |
| Time in physics | |
| Horology | |
| Calendar | Astronomical · Dominical letter · Epact · Equinox · Gregorian · Hebrew · Intercalation · Islamic · Julian · Leap year · Lunar · Lunisolar · Seven-day week · Solar · Solstice · Tropical year · Weekday determination · Weekday names |
| Archaeology & geology | |
| Astronomical chronology | |
| Units of time | |
| Related topics | |
