Enter follow-up date as YYYY-MM-DD.
Enter a complete follow-up date to add a reminder, or leave the field empty.
Why does this happen?
Follow-up date contains an incomplete date or an invalid calendar day.
How do I check it?
In Follow-up date, enter your planned check as YYYY-MM-DD, for example 2026-10-28 for 28 October 2026.
For an event without a follow-up reminder, leave Follow-up date empty. Keep Event date set to the day the event happened.
Choose Save, then check the saved event and, if you added a follow-up date, the linked reminder.
How do I verify the result?
The event keeps its actual date, with a linked reminder when you enter a follow-up date.
How do I keep my records safe?
Use the check date from your own plan; the example shows the format.