Describes the cause and action for error messages.
Error Message(English)：
kw in datum umwandeln
https://www.youtube.com/watch?v=W-a8mQNvPa4
Datumsformat per Formel andern - YouTube
https://www.youtube.com/watch?v=fqjltQoF9-g
https://www.youtube.com/watch?v=fqjltQoF9-g
Project 2010 - Kalenderwoche in Tabelle und Zeitskala - YouTube
https://www.youtube.com/watch?v=NRD8ZWgKQII
https://www.youtube.com/watch?v=NRD8ZWgKQII
Benutzerdefinierte Datumsformate - Tableau
https://onlinehelp.tableau.com/current/pro/desktop/de-de/dates_custom_date_formats.htm
Netschulung | Informationen, Tipps und Tricks zu ...
https://www.netschulung.com/
Format-Funktion (Visual Basic for Applications) | Microsoft Docs
https://docs.microsoft.com/de-de/office/vba/language/reference/user-interface-help/format-function-v・・・
DateDiff-Funktion (Visual Basic for Applications) | Microsoft Docs
https://docs.microsoft.com/de-de/office/vba/language/reference/user-interface-help/datediff-function・・・