Language/Multiple-languages/Culture/Calendars-and-Clocks

This is a list of calendar and timekeeping around the world.

Calendar

name	description
Gregorian calendar	The year one is the year of presumed birth of Jesus of Nazareth 12 months in a year Days for months: 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 The leap day is placed in the second month 1 leap day every 4 years, except when the year is divisible by 100 and not divisible by 400 (97 leaps in 400 years)
Chinese calendar	The year one is the year of presumed birth of Jesus of Nazareth 12 or 13 months in a year The month with winter solstice is the first month Leap month is the first month without a solar term of an even number 29 or 30 days in a month, determined by the moon phase The day with new moon is the first day of a month (7 leaps in 19 years)
Islamic calendar	The year one is the year of Hijrah 12 months in a year 29 or 30 days in a month, determined by the moon phase / 30 days in months of an odd number, 29 days in months of an even number Month with the leap day is the last month Leap year is the year when the remainder is over half a day The day with first sight of the crescent is the first day of a month Sunset is the start or end of a day (11 leaps in 30 years: year 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, 29)

Timekeeping

name	description
common timekeeping	1 day is divided by 12 units ‘hour’ evenly 1 hour is divided by 60 units ‘minute’ evenly 1 minute is divided by 60 units ‘second’ evenly
Chinese timekeeping	1 day is divided by 12 units ‘時’ evenly 1 時 is divided into 2 parts: ‘初’, ‘正’ Every 初 and 正 is divided by 4 units ‘刻’ evenly