/text/scalc/guide/calc_timevalues.xhp calculating;time differences time differences Calculating Time Differences If you want to calculate time differences, for example, the time between 23:30 and 01:10 in the same night, use the following formula: =(B2<A2)+B2-A2 The later time is B2 and the earlier time is A2. The result of the example is 01:40 or 1 hour and 40 minutes. In the formula, an entire 24-hour day has a value of 1 and one hour has a value of 1/24. The logical value in parentheses is 0 or 1, corresponding to 0 or 24 hours. The result returned by the formula is automatically issued in time format due to the sequence of the operands.