SQL Server datetime to bigint (epoch) overflow

Question

I have a \'datetime\' column with value 2013-03-22 15:19:02.000

I need to convert this value into epoch time and store it in a \'bigint\' field

The actual e

Answer 1

When tried to get exact milliseconds we get the overflow exception. we can get the values till seconds and multiply with 1000.

This is equivalent to new Date().getTime() in javascript:

Use the below statement to get the time in seconds.

SELECT cast(DATEDIFF(s, '1970-01-01 00:00:00.000', '2016-12-09 16:22:17.897' ) as bigint)

Use the below statement to get the time in milliseconds.

SELECT cast(DATEDIFF(s, '1970-01-01 00:00:00.000', '2016-12-09 16:22:17.897' ) as bigint) * 1000

convert epoch to human readable date time using below statement:

select DATEADD(s, 1481300537, '1970-01-01 00:00:00')