Quote Originally Posted by elric411
Try This

=IF(A1="P",NOW(),"")

Just make sure you format your "Time" cell to display properly.

HI
I am very happy to you. But, it is not properly work when I put "P" it is show current time
But when I second time put the value "P" so all cell changes the time it is not correct I
Want when I put the value "P" then current show time ant stop it. When I second time put the
Value "P" automatically show the current time without another cell time changes

Thanks