"This enrollment date is not valid: it must be between January 1, 1950 and today."

Where: Import students screen (import report, reason "invalid enrollment date") and a student's profile.

Why: the enrollment date read from the file is in the future, before January 1, 1950, or unreadable (for example 31/02/2024). A date without a four-digit year is not accepted.

What to do: fix the date in the file, then run the import again. If every date in a column is read backwards (day and month swapped), use the Swap day and month button in the preview. For a student already imported, the date is corrected in their profile (Edit): it is the one used for the active student count.