Units of Time , 时间单位 , shí jiān dān wèi 。
second , 秒 , miǎo 。
minute , 分钟 , fēn zhōng 。
hour , 小时 , xiǎo shí 。
day , 天 , tiān 。
week , 周 , zhōu 。
week , 星期 , xīng qī 。
month , 月 , yuè 。
quarter , 季度 , jì dù 。
year , 年 , nián 。
时间单位，是7种基本单位之一，长度、时间、质量、物质的量、光照度、电流 和（热力学）温度 是七种基本单位。现时每昼夜为二十四小时，在古时则为十二个时辰。当年西方机械钟表传入中国，人们将中西时点，分别称为“大时”和“小时”。随着钟表的普及，人们逐渐将“大时”淡忘，而“小时”沿用至今。
The unit of time is one of the seven basic units. Length, time, mass, quantity of matter, illuminance, current and (thermodynamic) temperature are the seven basic units. At present, every day and night is 24 hours, but in ancient times it was 12 hours. When Western mechanical clocks and watches were introduced to China, people called the Chinese and Western time points “big time” and “hour” respectively. With the popularity of clocks and watches, people gradually forget the “big hour”, and the “hour” is still in use today.
时间单位是测量时间所用的基本单位，从大到小排列分别为千年、世纪、年代、年、季度、月、旬、星期、日、时辰、小时、刻、字（闽南广东地区用法）、分、秒、毫秒（ms）、微秒（µs）、奈秒（ns）、皮秒（ps）、飞秒（fs）、阿秒（as）、仄秒（zs）。
The time unit is the basic unit used to measure time. It is arranged from largest to smallest as millennium, century, year, year, quarter, month, ten-day, week, day, hour, hour, engraving, character (used in Guangdong in southern Fujian), minute , Seconds, milliseconds (ms), microseconds (µs), nanoseconds (ns), picoseconds (ps), femtoseconds (fs), attoseconds (as), zep seconds (zs).
历史上时间单位是由天文物体的运动定义的。
以太阳为基础：这一年是地球围绕太阳旋转的时候。以年为单位的单位包括奥林匹克（四年），光泽（五年），指标（15年），十年，世纪和千年。
基于月球的月份：该月基于围绕地球的月球轨道周期。
基于地球的时间：地球在日d上观察所需的时间。最初从此基础得出的单位包括：每周7天，每两周14天。一天的细分包括小时（一天的1/24），该小时又细分为分钟和最后几秒。第二个成为国际科学标准单位（SI单位）。
基于天体的时间：与恒星时间一样，恒星和星座在天空中的视在运动用于计算一年的长度。
这些单元彼此之间没有一致的关系，需要插入。例如，一年不能分为12个28天，因为12乘28是336，远远少于365。阴历月（由月亮的自转定义）不是28天，而是28.3天。在公历中定义为365.2425天的年份必须使用leap日和leap秒进行调整。因此，这些单位现在都定义为秒的倍数。
基于秒数量级的时间单位包括纳秒和毫秒。
Historically units of time were defined by the movements of astronomical objects.
Sun-based: the year was the time for the earth to revolve around the sun. Year-based units include the olympiad (four years), the lustrum (five years), the indiction (15 years), the decade, the century, and the millennium.
Moon-based: the month was based on the moon’s orbital period around the earth.
Earth-based: the time it took for the earth to rotate on its own axis, as observed on a sundial. Units originally derived from this base include the week at seven days, and the fortnight at 14 days. Subdivisions of the day include the hour (1/24 of a day), which was further subdivided into minutes and finally seconds. The second became the international standard unit (SI units) for science.
Celestial sphere-based: as in sidereal time, where the apparent movement of the stars and constellations across the sky is used to calculate the length of a year.
These units do not have a consistent relationship with each other and require intercalation. For example, the year cannot be divided into 12 28-day months since 12 times 28 is 336, well short of 365. The lunar month (as defined by the moon’s rotation) is not 28 days but 28.3 days. The year, defined in the Gregorian calendar as 365.2425 days has to be adjusted with leap days and leap seconds. Consequently, these units are now all defined as multiples of seconds.
Units of time based on orders of magnitude of the second include the nanosecond and the millisecond.
