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select dateadd(s, 1261557316000/1000 ,'1970-1-1')


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select datediff(ss , '1970-01-01' , '2009-12-23 16:35:16')

/*

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1261586116

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*/


SQL code:
select dateadd(ss , 1261557316 , '1970-01-01')
/*

------------------------------------------------------
2009-12-23 08:35:16.000

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*


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