UNIX_TIMESTAMP in SQL Server

Question

I need to create a function in SQL Server 2008 that will mimic mysql\'s UNIX_TIMESTAMP().

Thanks in advance !

Answer 1

Sql Server 2016 and later have a DATEDIFF_BIG function that can be used to get the milliseconds.

SELECT DATEDIFF_BIG(millisecond, '1970-01-01 00:00:00', GETUTCDATE())

Create a function

CREATE FUNCTION UNIX_TIMESTAMP()
    RETURNS BIGINT
AS
BEGIN
    RETURN DATEDIFF_BIG(millisecond, '1970-01-01 00:00:00', GETUTCDATE())
END

And execute it

SELECT dbo.UNIX_TIMESTAMP()

Answer 2

For timestamp with milliseconds result I found this solution from here https://gist.github.com/rsim/d11652a8336137832df9:

SELECT (cast(DATEDIFF(s, '1970-01-01', GETUTCDATE()) as bigint)*1000+datepart(ms,getutcdate()))

Answer from @Rafe didn't work for me correctly (MSSQL 20212) - I got 9 seconds of difference.