(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 code#
Secret message: If you love my tools, then I love you, too! Use coupon code TOOLLING to get a discount at my company.For other uses, see Hour (disambiguation). Browserling itself is an online cross-browser testing service powered by alien technology. Behind the scenes, it's actually powered by our web developer tools that are used by millions of people every month.
1 day 22 hr 10 min timer generator#
This clock time generator was created by me and my team at Browserling. The output format values HH and H get replaced by the numeric hours, MM and M get replaced by the numeric minutes, and SS and S get replaced by the numeric seconds. The output formatting is performed by using the String.replace() function. To convert the 24-hour time format to the 12-hour format, the after-the-noon hour values get 12 subtracted from them. This is done by using the inverse function of the formula above. After that, it turns the saved seconds back to hours, minutes, and seconds. The loop starts by assigning the startInSeconds value to the variable currentTimeInSeconds and in every iteration adds (or subtracts, if time is generated in reverse) the intervalInSeconds step value to the currentTimeInSeconds value, and saves this number in the output list outputTimes. To generate count (specified in options) time values in the output list, it runs a for loop count times. To calculate just the seconds from hours, minutes and seconds, it uses the formula hours*3600 + minutes*60 + seconds. The start time is stored in the startInSeconds variable and the delta in the intervalInSeconds variables. If the time format is correct, then it converts both time values to seconds as it's easier to do the time arithmetic in seconds. The first regexp is /(\d)\s*(am|pm)/i that matches the 12-hour clock time format. It uses four different regular expressions to test the correctness of the input time. It starts by validating and parsing the given start and interval time values.
1 day 22 hr 10 min timer series#
This linear time series generator works entirely in your browser and is written in JavaScript.
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