When one enters a date value in a cell, the cell shows a number. It is expected that the cell, upon recognizing the date value and converting it to its internal numerical equivalent, the cell receives a default date format.
I can not confirm with 5.0.5.2. Probably is cell formatted as number. Check format of the cell. If cell is formatted properly, attach test file and specify what you write into the cell.
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Thank you for your attention. From comment #1 I was able to determine that this was due to the usage of a custom template. I'm sorry for wasting your time.