You could add 24 to negative values, which would give you 10 in you example which seems correct
Ie:
A better way would be to have shift start time and shift end time in different cells, use the whole date/time as the value, and format the cells to only show the times,
then you could simply subtract start from end, with the cell the formula is in formatted as [h]:mm
this works so well because of the way excel stores dates and times, dte is stored to the left of the decimal point (the "integer" part of the date/time) and time is stored to the right (the "decimal" portion) so 12 hours works out to 0.5 for example)
so as an example :
A1= start date/time (formatted as time, 24:00)
B1= end date/time (formatted as time, 24:00)
C1= B1-A1 (formatted as [h]:mm)
Hope this helps
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