Time in blender

can somebody explain me how to add time in blender? kind of clock. and when i die or something i stop

time or timer?

solution 1:
use a timer property. It constantly increases its value by the time difference from previous frame. You can set it to any value you like. The time difference will be added before evaluating the sensors.
(Hint: use property sensors in interval mode rather then equal mode)

solution 2:
use delay sensors

solution 3:
use python timers. Refer to the Python documentation. This allows access to the PC clock with current date/time as well.