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Why do the working days of the standard calendar have to be equally long?

With working days that are of different duration, there are problems when calculating the time period since, in this case, the length of one day is not defined unambiguously. Theoretically, in fact, the average duration of one day could be used, but this leads to illogical results in practice.


Working time Mo - Th:   8:00 Uhr - 16:00 Uhr, Duration:  8:00 h

Working time Fr:            8:00 Uhr - 14:00 Uhr, Duration:  6:00 h

Average duration:                                                                7:36 h

The calculated duration of the time period from Monday 8:00 AM to Tuesday 4:00 PM would be computationally 2 days and 0:48 hours (16 hours - 2 x 7:36 hours = 0:48 hours), the duration from Thursday 8:00 AM to Friday 2:00 PM would be 1 day and 6:24 hours (14 hours - 7:36 hours = 6:24 hours)! However, both results are values that cannot be comprehended without an explanation!

Since the duration merely specifies the distance between two time points, different working times of the days in between do not play any role (a task that, for example, stretches from Tuesday to Thursday always, "lasts" 3 days, regardless of how long you "work" on these 3 days)!

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User-defined calculations


Are there columns, with which user-defined calculations may be performed by entering a formula in them, for example?


This is not possible in the main table of A-Plan. However, with the A-Plan 2009 version or higher, you can insert any number of additional columns in the reports (MS-Excel format) that can be combined with other columns using calculation rules.