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Converting Unix time to SQL Server datetime

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Unix time, or POSIX time, is a system for describing points in time: it is the number of seconds elapsed since midnight UTC of January 1, 1970, not counting leap seconds


Here is how you do it in SQL Server. To get the datetime value for a value stored in Unix time you need to add the seconds to the base Unit time which is '19700101 05:00:00:000'


The following code will give you an output of '2010-05-25 07:56:23.000'

  1. SELECT dateadd(s,1274756183,'19700101 05:00:00:000')


To get the datetime for Unix time for January 1, 2001 run this

  1. SELECT dateadd(s,946666800,'19700101 05:00:00:000')


See also http://wiki.lessthandot.com/index.php/Epoch_Date for the reverse, converting from datetime to Unix time


Contributed by: --SQLDenis 17:32, 25 May 2010 (GMT)

Part of SQL Server Programming Hacks

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