Detect date/time formatted cells in XLSX #198
Merged
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A lot of this logic is inspired by https://pypi.org/project/openpyxl/, which is also MIT licensed.
This handles built-in date formats and a some custom date formats that only use some common characters like HMS or :./.
This works with https://www.rki.de/DE/Content/InfAZ/N/Neuartiges_Coronavirus/Daten/Impfquotenmonitoring.xlsx?__blob=publicationFile, which uses a builtin date format. Libre Office always seems to produce a custom format so the testcase only uses that.