This is commonly referred to as Unix time.
#Unix epoch windows
(For example, they won't roll over in 2038. On Windows and most Unix systems, the leap seconds are not counted towards the time in seconds since the epoch. Select ( cast (GetUTCDate() as float) - * 86400.0įLOATs actually default to 8-byte doubles on SQL Server, and therefore superior to 32-bit INT for many use cases. as a const because it isn't going to change. Current time in number of seconds since Unix Epoch ( 00:00:00 GMT). Future developers may hate you, but you can put the offset in Select ( cast (GetUTCDate() as float) + * 86400 Monitor workloads on servers, virtual machines,and containers. Track uptime for website, APIs, and applications using synthetic checks.
#Unix epoch free
The original Unix Epoch based on Old UTC (UT based) is actually about 2 seconds different. Try it now Free online epoch/unix timestamp converter. (UTC) Convert epoch to human-readable date and vice versa Enter a Timestamp Supports Unix timestamps in seconds, milliseconds, microseconds and nanoseconds. than above, but works on any edition of SQL Server. For completeness of this thread, I suppose I should add that this entire discussion with Unix Epoch of 00:00 UTC assumes the redefinition of Unix Epoch using backwards extension of Modern UTC (TAI based), which didn't start until 1972. The Current Epoch Unix Timestamp 1694297599 Seconds since Jan 01 1970. Note datetimes are only accurate to 3 msec, so this is less precise The times indicated in the boxes are the. Set = (CAST as float) * 86400) + as float ) / 1000) This script allows a simple but effective local time conversion between the UNIX epoch time and standard date and time. the right way, for sql server 2008 and greater So while there is no systematic drift between the two systems when a leap second occurs, they will not agree at the sub-second level during and immediately following a leap second. This wikipedia article discusses how unixtime behaves during leap seconds Windows I believe just views leap seconds like any other clock error. Now I know at this point, you are thinking WHAT ABOUT LEAP SECONDS?!?! Neither Windows time nor unixtime really believe in leap seconds: a day is always 1.00000 days long to SQL Server, and 86400 seconds long to unixtime. (I can't believe they introduced a whole new DATETIME2 datatype without fixing this.)įor regular old DATETIME, I just use a sleazy cast to float, which returns (floating point) number of days since 1900. Sadly there is no DATEDIFF2 function, so various tricks are required to avoid DATEDIFF integer overflow even with 2008+.
The DATETIME datatype on SQL Server is only good to 3 msec, so I have different examples for SQL Server 20+.
The following will give you the current unixtime as FLOAT wrap per answers above to get a function or convert arbitrary strings. I often need a unix timestamp with millisecond precision.
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