Oracle provides multiple ways to check if a date is valid or not. One way is to use the TO_DATE function. The TO_DATE function converts a string to a date. If the string is not a valid date, then the TO_DATE function returns an error.
Another way to check if a date is valid is to use the TRUNC function. The TRUNC function truncates a date to a specified unit. If the date is not valid, then the TRUNC function returns an error.