Excel working time calculation

Question

I am trying to put together an excel spreadsheet to track working time. A standard working day is say 8 hours with one hour lunch, say 40 hours total, 35 hours working. I need to track over and under time on a given day, and total this for a week period. The reason is to that if someone only takes a 30 minute lunch for three days, they can then take 1.5 hours off early at the end of the week for example.

Example daily record:

Mon - 9-6, 1 hour lunch = 8 working hours, 1 hour lunch, balance = 0 (the perfect day)
Tue - 8-6, 1 hour lunch = 9 working hours, 1 hour lunch, balance = +60 (one hour over)
Wed - 9-4, 1 hour lunch = 7 working hours, 1 hour lunch, balance = -60 (one hour under)
Thu - 9-6, 30 min lunch = 8 working hours, 30 min lunch, balance = +30 (30 mins over)
Fri - 9-6, 30 min lunch = 8 working hours, 30 min lunch, balance = +30 (30 mins over)

Example end of week totals

I am recording start/end/lunch times in excel in custom "time format" cells: 09:00 - 17:00 I am getting the hours with this formula: =TEXT(End-Start,"hh:mm") I enter the lunch time in "time format" 00:30 (30 mins) I get the actual time worked with this formula: =TEXT(Total-Lunch,"hh:mm")

When I try to add together / sum the values however I am not getting anything...

Any thoughts?

Answer 1

I do this with six columns

Date  / Start   / Lunch    / Lunch   / Stop    / total
3-sep / 8:29 AM / 12:30 PM / 1:30 PM / 5:44 PM / 8.25

For total, I calculate with the function =MROUND((D5-C5+F5-E5)*24,0.25) . This rounds the total to the closest 0.25 hour (that is, 15 min).

Just for kicks, I accumulate the excess hours. Excel will put in the current time by pressing Ctrl+Shift ; (semicolon).