I used the below statement:

e.g.,

SELECT dateadd(hh,5.30,CAST(635302120392663258/864000000000.0 - 693595.0 AS DATETIME))

It's giving me a difference of approx. 30 minutes.

When I don't add the UTC difference, the result has a huge difference.

I am using Sql Server 2012.

Thanks...