hi
Can u tell me where i can get tutorial in which timer property is used i need this because i have confusion about using this property?
What do u need to do? Timer starts at 0.0 and counts up, you can reset it, then it keeps counting up again… its useful…
Yes, timer is quite easy, just add one! 
How to use it? Here’s an example:
Add a cube to the scene!
Add a timer property, name it time
Add Property Sensor- Interval-Prop:time-Min: 9 -Max:10 -> AND -> Motion Actuator -DRot -Z:1.00
This way, when the property timer will reach 9.1 the cube will rotate…I hope
Bye