SQL Server updating a time stamp column

Question

In my database I have a timestamp column. I need to update a row in the table and need to update the timestamp column. When I run an update command

Answer 1

You don't

The timestamp column is updated automatically. Perhaps you are under the impression that timestamp contains a value relating to the time? It doesn't, but simply is a number which is updated whenever a value in that record is. Think of it like a row version number.

From MSDN:

The timestamp data type is just an incrementing number and does not preserve a date or a time.