Convert UTC Milliseconds to DATETIME in SQL server

Question

I want to convert UTC milliseconds to DateTime in SQL server.

This can easily be done in C# by following code:

DateTime startDate = new DateTime(1970         


        

Answer 1

The DATEADD requires an integer as a second argument. Your number 1348203320000 is very large for integer therefore it produce an error in runtime. Your should use bigint type instead and provide DATEADD with correct int values by splitting your milliseconds to seconds and milliseconds. That is sample you could use.

DECLARE @total bigint = 1348203320000;

DECLARE @seconds int = @total / 1000
DECLARE @milliseconds int = @total % 1000;

DECLARE @result datetime = '1970-1-1';
SET @result = DATEADD(SECOND, @seconds,@result);
SET @result = DATEADD(MILLISECOND, @milliseconds,@result);
SELECT @result