In 1788, Claude Boniface Collignon proposed dividing the day into 10 hours or 1000 minutes, each new hour into 100 minutes, each new minute into 1000 seconds, and each new second into 1000 tierces (Latin for "third"). This division would result in much easier and more convenient calculations and would be very preferable to the arbitrary division of the livre into twenty sous, of the sou into twelve deniers, of the day into twenty-four hours, the hour into sixty minutes, etc. It would be very desirable that all divisions, for example of the livre, the sou, the toise, the day, the hour, etc. In 1754, Jean le Rond d'Alembert wrote in the Encyclopédie: France Īstronomical table from the Almanach national de France using decimal time Chinese decimal time ceased to be used in 1645 when the Shíxiàn calendar, based on European astronomy and brought to China by the Jesuits, adopted 96 ke per day alongside 12 double hours, making each ke exactly one-quarter hour. In 1280, the Shoushi (Season Granting) calendar further subdivided each fen into 100 miao, creating a complete decimal time system of 100 ke, 100 fen and 100 miao. Several of the roughly 50 Chinese calendars also divided each ke into 100 fen, although others divided each ke into 60 fen. Other numbers of ke per day were used during three short periods: 120 ke from 5 to 3 BC, 96 ke from 507 to 544 CE, and 108 ke from 544 to 565. The midnight-to-midnight day was divided both into 12 double hours ( traditional Chinese: 時辰 simplified Chinese: 时辰 pinyin: shí chén) and also into 10 shi / 100 ke ( Chinese: 刻 pinyin: kè) by the 1st millennium BC. Main article: Traditional Chinese timekeepingĭecimal time was used in China throughout most of its history alongside duodecimal time. It also adjusts well to digital time representation using epochs, in that the internal time representation can be used directly both for computation and for user-facing display. 54321 can be interpreted as five decimal hours and 43 decimal minutes and 21 decimal seconds after the start of that day, or a fraction of 0.54321 (54.321%) through that day (which is shortly after traditional 13:00). This property also makes it straightforward to represent a timestamp as a fractional day, so that. For instance, 1:23:45 is 1 decimal hour and 23 decimal minutes and 45 decimal seconds, or 1.2345 decimal hours, or 123.45 decimal minutes or 12345 decimal seconds 3 hours is 300 minutes or 30,000 seconds. Therefore, it becomes simpler to interpret a timestamp and to perform conversions. The main advantage of a decimal time system is that, since the base used to divide the time is the same as the one used to represent it, the whole time representation can be handled as a single string. This term is often used specifically to refer to the time system used in France for a few years beginning in 1792 during the French Revolution, which divided the day into 10 decimal hours, each decimal hour into 100 decimal minutes and each decimal minute into 100 decimal seconds ( 100 000 decimal seconds per day), as opposed to the more familiar UTC time standard, which divides the day into 24 hours, each hour into 60 minutes and each minute into 60 seconds ( 86 400 SI seconds per day). Decimal-time clock reading 2.50 DT equivalent to 06:00 standard timeĭecimal time is the representation of the time of day using units which are decimally related.
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