Junghans J645.82 Manual Del Usuario página 4

Setting the date
Date alteration should not be performed between 8 PM and
3 AM, as in this period the date is switched automatically by the
movement and damage may be caused to the switching mechanism.
1.2 Operating the chronoscope
Starting time measurement (max. stop time 60 minutes)
Stopping time measurement
Resetting
Addition time measurement
Measuring split times