Apple reminders app not saving

"Apple reminders app not saving: Every time I enter a reminder for a future date a few seconds after I save the reminder it changes the date to today and shows past due. I then have to go back in and change the date to the correct future date and it works. How do I make the reminder work correctly the first time? I had a 16 pro max previously and just upgraded to the 18 pro max and it has done it on both phones."

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Update your iPhone:

iOS27 is compatible with your device. So, update it, and then perform a restart. Other than updating on the iPhone itself, you can do so using a Computer and Cellular. Report back where that gets you.

Two Major Steps: - Backup then Update

1. Backup First: Make a backup of your device using iCloud or your computer. That way, you'll have something to restore it from, should anything go wrong ding update installation.

2. Then, Update Using my User Tips:

• Update your iPhone Using a Computer - User Tip
• Use an iPhone 12 or later, that is using 5G, in order to update over Cellular - User Tip