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The Vietnamese calendar ( Vietnamese: âm lịch; chữ Hán: 陰曆) is a lunisolar calendar that is mostly based on the lunisolar Chinese calendar. As Vietnam 's official calendar has been the Gregorian calendar since 1954, [1] the Vietnamese calendar is used mainly to observe lunisolar holidays and commemorations, such as Tết Nguyên Đán and Tết Trung Thu .
Unix time [a] is a date and time representation widely used in computing. It measures time by the number of non- leap seconds that have elapsed since 00:00:00 UTC on 1 January 1970, the Unix epoch. In modern computing, values are sometimes stored with higher granularity, such as microseconds or nanoseconds .
Date and time notation in Vietnam describes methods of expressing date and time used in Vietnam . Date In Vietnam, dates follow the "day month year" order. All-numeric dates can be written as: [1]
Epoch (computing) In computing, an epoch is a fixed date and time used as a reference from which a computer measures system time. Most computer systems determine time as a number representing the seconds removed from a particular arbitrary date and time. For instance, Unix and POSIX measure time as the number of seconds that have passed since ...
Epoch In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured.
Conversion Conversion from Gregorian calendar years to Before Present years is by starting with the 1950-01-01 epoch of the Gregorian calendar and increasing the BP year count with each year into the past from that Gregorian date.
Proleptic Gregorian calendar The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. In nations that adopted the Gregorian calendar after its official and first introduction, dates occurring in the interim period of 15 October 1582 (the first date of use of Gregorian calendrical dates, being dated 5 ...
Conversion between Julian and Gregorian calendars The tables below list equivalent dates in the Julian and Gregorian calendars. Years are given in astronomical year numbering . This is a visual example of the official date change from the Julian calendar to the Gregorian