My current input is in upper and lower case.
Is that about date (like today 2021-May-21) or text input data?
If they are actual dates (numbers formatted as dates) you could use an all upper case font such as Bebas Neue, Cinzel, or a slightly mixed one like Mate SC. This would change only the display, not the underlying characters. Copying into another document or using a different font would revert to mixed case