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nmartensen authored
Since dates, times, and elapsed time are all usually stored as simple numbers in XLSX, openpyxl uses a heuristic to recognize the values as date/time representation and returns datetime.datetime or datetime.time objects for them. The heuristic is based on inspecting the number format style string (is this a date format?) and the stored value itself (to distinguish times from datetimes). This commit refines the heuristic by adding support for recognizing and returning time interval durations as datetime.timedelta. --HG-- branch : 3.0
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