(9:45 may be read "nine forty-five" or "a quarter till ten".) Fifteen minutes before the hour may be expressed as "a quarter to", "of", "till", or "before" the hour. (1000 is read "ten hundred" or "ten hundred hours" 10 pm would be "twenty-two hundred".)įifteen and thirty minutes past the hour is expressed as "a quarter past" or "after" and "half past", respectively, from their fraction of the hour. Hours on a 24-hour clock ("military time") are expressed as "hundred" or "hundred hours". (10 am and 10 pm are both read as "ten o'clock".) Whole hours on a 12-hour clock are expressed using the contracted phrase o'clock, from the older of the clock. The time of day is typically expressed in English in terms of hours. Its Proto-Indo-European root has been reconstructed as *yeh₁- ("year, summer"), making hour distantly cognate with year. Like Old English tīd and stund, hṓrā was originally a vaguer word for any span of time, including seasons and years.
The Anglo-Norman term was a borrowing of Old French ure, a variant of ore, which derived from Latin hōra and Greek hṓrā ( ὥρα). It displaced tide tīd, 'time' and stound stund, span of time. Hour is a development of the Anglo-Norman houre and Middle English ure, first attested in the 13th century. However, on rare occasions an hour may incorporate a positive or negative leap second, effectively making it appear to last 3,599 or 3,601 seconds, in order to keep UTC within 0.9 seconds of UT1, the latter of which is based on measurements of the mean solar day. In the modern metric system, hours are an accepted unit of time defined as 3,600 atomic seconds. Since this unit was not constant due to long term variations in the Earth's rotation, the hour was finally separated from the Earth's rotation and defined in terms of the atomic or physical second.
Such seasonal hours, also known as temporal hours or unequal hours, varied by season and latitude.Įqual hours or equinoctial hours were taken as 1⁄ 24 of the day as measured from noon to noon the minor seasonal variations of this unit were eventually smoothed by making it 1⁄ 24 of the mean solar day. The hour was initially established in the ancient Near East as a variable measure of 1⁄ 12 of the night or daytime. There are 60 minutes in an hour, and 24 hours in a day. on a 24-hour clock with a digital faceĪn hour ( symbol: h also abbreviated hr) is a unit of time historically reckoned as 1⁄ 24 of a day and defined contemporarily as exactly 3,600 seconds ( SI). Midnight (or noon) to 1 on a 12-hour clock with an analogue face Midnight to 1 a.m.
#1 DAY 22 HR 10 MIN TIMER HOW TO#
On the following time calculation steps, we show how to subtract time in seconds.For other uses, see Hour (disambiguation). On the following time calculation steps, we show how to add time in seconds. Examples for Time CalculatorĪdd Hours Minutes Seconds to Time Calculation There is also some very useful information about time measurement units and the specifics of their conversions between each other. This online Time Calculator is very easy to use and can be of a great help to anyone who needs to make this type of calculation related to scientific work, studies, some daily activities, and so on. It is a great and effective online tool to calculate how much time left till a certain moment of time, or calculate the exact duration between two specified points in time. This is the webpage where our online Time Calculator is presented. And the clear button resets the time inputs. Now button will set the starting time to the current time. You can increase or descrease the hours, minutes and seconds value of time by your keyboard up and down keys. You can choose the time calculation operation to add or subtract on the form above.Ĭalculation will be performed just after the operation selected. Time calculator can add or subtract hours, minutes, seconds to the starting time you've entered.Ĭalculated time result will be shown on the right box as total days, hours, minutes and seconds.Īlso the clock time will be calculated and listed below the time result.
0 kommentar(er)
