For example:
Tim gets two shifts today. One is 10:00-14:00 and the other is 19:00-22:00. He has to clock in/out four times (clock in twice and clock out twice).
10:00-14:00 (The first time employee clock in and out)
19:00-22:00 (The second time employee clock in and out)
No matter how many shifts employees gets, they need to clock in/out in the time range of each shift.
Notice:
Do not have two overlapped working time when you edit employees' shifts.