hi,
I have datetime in cells A1:D1
A1: 2018-12-03 06:00 (day work start);
A2: 2018-12-03 10:00 (breakfast break start);
A3: 2018-12-03 11:00 (breakfast break stop);
A4: 2018-12-03 15:00 (day work stop);
So normally this is 9hrs work day with 1hr break included. The workers are payed for 8hrs...