![]() In certain countries, 24-hour time is referred to as military time, since this is the time format used by militaries (and other entities) around the world, where unambiguous time measurement is particularly important. The hours from 0-11 denote what would be the AM hours on a 12-hour clock, while hours 12-23 denote the PM hours of a 12-hour clock. This time format is an international standard, and is often used to avoid the ambiguity resulting from the use of a 12-hour clock. Using the terms "12 midnight" and "12 noon" can remove ambiguity in cases where a person may not be accustomed to conventions.Ī 24-hour clock typically uses the numbers 0-23, where 00:00 indicates midnight, and a day runs from midnight to midnight over the course of 24 hours. On digital clocks and watches, "AM" stands for ante meridiem, meaning "before midday," while "PM" stands for post meridiem, or "after noon." By convention, 12 AM denotes midnight, while 12 PM denotes noon. Enter the number of hours and/or minutes you wish to add to or subtract from the clock time. ![]() Depending on the clock being used, most analog clocks or watches may not include an indication of whether the time is in the morning or evening. Clock Math Calculator From a selected clock time, add or subtract hours and/or minutes Enter clock time information at 'From:' Enter hours and minutes. Change the number format of the values in cell A2, B2 and C2 to General. Change the Time format to display a time with or without AM/PM. PM is used for times in the afternoon and evening. Note: AM is used for times in the night and morning. ![]() Most people read time using either a 12-hour clock or a 24-hour clock.Ī 12-hour clock uses the numbers 1-12. Simply subtract the start time from the end time. Related Time Card Calculator | Time CalculatorĪn 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.
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