Clear Time Stamps
You can clear one or more of the existing time stamps and re-enter the desired values.
Steps:
1). Open the assigned work order for which you want to clear existing timestamp.
2). On the toolbar and on the 
Log menu, click 
Time stamps.
3). In the Time Stamps window, and on the toobar, click Clear Timestamps.
4). In the Clear Timestamps window, clear the desired timestamps.
9).On the toolbar, click 
Save