Unix timestamps and therefore the need to convert to and from epoch time and human readable dates and times are widely used in databases (MySQL, Oracle, PostgreSQL, SQL Server) and various programming languages such as C++, C#, PHP, Python, JavaScript, Ruby, Perl, Java, R, and more. Every day in Unix time contains exactly 86400 seconds meaning that no seconds are being added to or subtracted from the day as a result of positive or negative leap seconds. Unix time is not adhering to UTC due to how leap seconds are handled. The Unix epoch is 00:00:00 UTC on 1 January 1970 and is defined as such in relation to the fact that the Unix operating system it was first used on was invented just a few months prior in 1969. A Unix timestamp is simply the number of seconds that have elapsed since the Unix epoch, excluding leap seconds. It is often referred to as "Unix timestamp", "Epoch time", "Posix time" in technical documentation and slang. In computing, Unix time is a system for uniquely describing a point in time with an accuracy of up to a second, though some systems may extend that to a millisecond (e.g. The same applies in case of specifying the minutes without entering seconds.
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