Hello jasmina243,
We understand your Reminders app on your MacBook Air isn't showing any set reminders on the correct day. We have a few questions to help clarify the issue, then we'll provide a few steps to help us narrow down what might be causing this.
- When you checked your time zone settings, do you mean your date and time are set correctly?
- Is your iPhone and iPad date and time set the same as your MacBook Air?
- Does the Calendar app show appointments on the correct day?
We'd like you to test the Reminders app while booted to safe mode. This will help rule out any possible login items causing the issue. Then, we'd like you to create a test user profile, log in to it and test Reminders. This will help determine if it's something specific to your user profile.
How to use safe mode on your Mac - Apple Support
Change Users & Groups settings on Mac - Apple Support
We look forward to hearing back from you.
Best regards.