Copy/paste or importing a date into a date field

When in Table mode on Ninox Cloud and in a Date field, and I manually copy a date from one record to another record (e.g., "2019-11-30") in the same Date field, and paste the value, I get instead "2019-11-29". It is subtracting one day from the copied date. The same thing happens to many (but not all) dates when I'm importing records into the same Date field. This is not good for date-sensitive records. Am I doing something wrong?