We apologize for the inconvenience.
This may be caused by your device's clock settings or its automatic time zone adjustment.
Please try the following steps:
1. On your device, open "Settings" > "System" > "Date & time", turn "Automatic date and time" off once, and then turn it back on.
2. Open Simple Diary and set your preferred time again in "Reminder Settings".
3. Restart your device.
These steps may temporarily resolve the issue.
Thank you for your cooperation.