美国东部时区现在是夏令时间。

Use the calculators below to find the number of hours and minutes between two times. For a full time card, please use the Time Card Calculator. An hour is most commonly defined as a period of time equal to 60 minutes, where a minute is equal to 60 seconds, and a second has a rigorous scientific definition. There are also 24 hours in a day.

Simply enter the 12-hour time value into the box on the left and select between ante meridiem (am) or post meridiem (pm) options. Hit the 'Convert' button. To convert 12 hour time to 24 hour time format we follow the steps below: If the time is between 12:00 AM and 12:59 AM, we …

How many hours is 1 pm to 9 pm? Use the hours between two times calculator to find out how many hours is 1pm to 9pm. Easily calculate the exact difference in hours and minutes between two given times. In this case, there are eight hours and between 1pm and 9pm.

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你的朋友可以让你在4月13日凌晨00:01（12:01 am）到达机场，或者，如果要在下一个午夜到达，那就在4月13日晚上11:59（11:59 pm ）到达。 或者，24小时格式也可以使用。

Input a time zone below to convert 9:00 PM GMT +1 Time: * : Under daylight saving time (DST) or summer time adjustment.

The AM - PM Calculator can quickly determine how many hours between morning and afternoon hours and vice versa (example 7:00AM to 4:00PM or 9:00PM to 5:00AM). Counting off the difference between these times seems to be a tidious task for most people that's why this calculator is made.

“am”和“pm”分别表示什么时间？ 时间am的全称是 ante meridiem(before noon)， 上午 （0：00-12：00）。 时间pm的全称是post meridiem (=afternoon) ，下午（12：01-24：00)。

Unlike the 24-hour clock, which spans the entire day, the 12 hour clock only spans 12 hours. The period from 12 AM to 12 PM is the first half of the day, and the period from 12 PM to 12 AM is the second half of the day. Below is a table that shows the progress of time over the course of a day in both the 24 and 12-hour clocks.