Thanks! But I have a question:

I have a table field 'Timestamp', data type is datetime.

I wrote a procedure which will check the value of 'Timestamp' before saving an old record. If current date and time are newer than 'Timestamp', it will replace the record.

'A' workstation runs the procedure at 1:00pm, and 'B' workstation runs it at 
1:01pm. Normally, the value of 'Timestamp' is today and 1:01pm.

But unfortunately, they got the same date, except time. 'A' workstation got 1:00pm, 'B' workstaion got 12:59pm. Although 'B' ran the procedure later, it cannot replace the record forever.

Do I get the current date and time from the server? If yes, how to get them?