Question

I’m rather new to ASP.NET and SQL, so I’m having a tough time trying to figure out how to compare two time columns. I have a timestamped column and then a Now() column in an .mdb database. I need to have a gridview display records that are “Greater than or equal to 3 hours” from the timestamp. Any idea how I can accomplish this?

Answer 1

The Transact-SQL timestamp data type is a binary data type with no time-related values.

So to answer your question: Is there a way to get DateTime value from timestamp type column?

The answer is: No

You need another column of datetime2 type and use > operator to for comparison. You might want to set default value of getutcdate() to set it when each row is inserted.

UPDATE:

Since the column is of datetime type and not timestamp type (there is a type in SQL Server called timestamp, hence the confusion) you can just do

WHERE [TimeCalled] <= DATEADD(hour, -3, GETDATE())

Make sure your server is running in the same timezone as your code. It may be safer to store all dates in UTC. In that case use GETUTCDATE instead on GETDATE