Convert SQL Server DateTime object to BIGINT (.Net ticks)

Question

I need to convert a DateTime type value to BIGINT type in .Net ticks format (number of 100-nanosecond intervals that have elapsed since 12:00:00 midnight, January 1, 0001).<

Answer 1

This function returns the unix time:

alter FUNCTION [dbo].[GETTICKS] (@datetime datetime)
RETURNS bigint
WITH SCHEMABINDING
AS
BEGIN 
    RETURN 
        DATEPART(millisecond,@datetime) +
        CONVERT(bigint, 
                    1000 * (
                        DATEPART(second,@datetime) +
                        60 * DATEPART(minute,@datetime) +
                        3600 * DATEPART(hour,@datetime) +
                        3600 * 24 * DATEPART(DAYOFYEAR,@datetime) +
                        convert(bigint, 3600 * 24 * (((DATEPART(year,@datetime) - 1970) * 365) + ((DATEPART(year,@datetime) - 1972) / 4)))
                ) )
END