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

Epoch to datetime

create function [dbo].[EpochToDate](@Date bigint)
returns datetime
begin
    return (select dateadd(s, @Date, '19700101'))
end