How to calculate the number of days my passport stays?

1. is your calculation method. The time is counted from the time when the immigration department seals it. 89 days ago.

The date of your application is not necessarily the same as the date approved by the embassy, but generally the same as the date of your application. The number of days approved by the embassy shall prevail. 89 days is a strange number. Just press 89 days

I haven't been to Germany. If Germany is not particularly strict about this, there will be no problem for a day or two. If you are strict with this, you'd better ask the airline to issue a certificate or at least make a phone call. If the plane is delayed, you must go through the relevant formalities to confirm the next flight time. If yes, you can explain it. If it's because of the weather, or the airline canceled it temporarily after passing the security check, this should be arranged by the airline.