Our new GMT Time Magic might look a bit confusing thanks to advanced use of if/else statement, but don't get disgusted. What if we already have our own timestamp and just want to make sure it's correct? Let's modify our function a little bit Last time we've forgotten a quite important use for our script - input timestamp correction. How to fix that and ALWAYS get the proper base date for all calculations?Īs you can see, this simple function returns the proper GMT Timestamp, so to use it in any following code you need something like this: When a leap second is inserted (which has occurred on average once every year and a half), the Unix time number increases continuously during the leap second, during which time it is more than 86 400 s since the start of the current day, and then jumps down by 1 at the end of the leap second, which is the start of the next day.Īny comments are welcome, please visit the forumĬonfused by using gmdate() and still getting wrong time? It's happening thanks to daylights saving time and wheter the server is in summer or winter time zone. When a leap second is deleted (which has never occurred as of 2006), the Unix time number (timestamp) jumps up by 1 at the instant where the leap second was deleted from, which is the end of the day. The Unix time number - timestamp increases by exactly 86 400 each day, regardless of how long the day is. When a leap second occurs, so that the UTC day is not exactly 86 400 s long, a discontinuity occurs in the Unix time number. UTC days are mostly 86 400 s long, but are occasionally 86 401 s and could be 86 399 s long (though the latter option has never been used as of December 2006) in order to keep the days synchronised with the rotation of the Earth (or Universal Time). UTC counts time using SI seconds, and breaks up the span of time into days. Modern Unix time and it's timestamp is based strictly on UTC. For example, if you need to refer to 10 days from today, it is easier to add (10 days * 24 hours * 60 minutes * 60 seconds) seconds to the current timestamp than using several conditions to separate the related description words. They are much easier to manipulate than any other date/time strings. Unix timestamps are the number of seconds since midnight, JanuGMT (referred to as the Epoch). It is neither a linear representation of time nor a true representation of UTC (though it is frequently mistaken for both) as the times it represents are UTC but it has no way of representing UTC leap seconds (e.g. It is widely used not only on Unix-like operating systems but in many other computing systems. Unix time or POSIX time, is a system for describing points in time: it is the number of seconds (timestamp) elapsed since midnight UTC of January 1, 1970, not counting leap seconds. Despite controversy, many countries have used it since then details vary by location and change occasionally. Presaged by a 1784 satire, modern DST was first proposed in 1907 by William Willett, and 1916 saw its first widespread use as a wartime measure aimed at conserving coal. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn the ancients lengthened summer hours instead. If you are concerned about daylight saving time don't worry, our tools take it into consideration as well.ĭaylight saving time (DST), also summer time in British English, is the convention of advancing clocks so that afternoons have more daylight and mornings have less. You can convert here unix timestamps into human readable dates/times, dates into timestamps and strings into timestamps. The default initial time of midnight (0 hours, 0 minutes and 0 seconds) will return the starting point of the UNIX timestamp, 0. Click on the related buttons and the UNIX timestamp in seconds will be calculated. These calculators are designed to calculate and display the UNIX timestamp from entered data for standard universal time in month, day, year, hour, minute and second format, based on GMT or other timezones. Our free unix (epoch) timestamp conversion tools and converters require the use of JavaScript enabled and browsers capable of receiving AJAX XML responses.
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