US citizenship naturalization form N-400 question?

I got stuck on Part 7 where I have to record my "time outside the US". The problem is that I forgot the date that I left the US. On my passport, only the date that I returned to US is recorded. Those trips are over 5 years ago. I checked with the airline, but they don't have any record. Any tips... show more I got stuck on Part 7 where I have to record my "time outside the US". The problem is that I forgot the date that I left the US. On my passport, only the date that I returned to US is recorded.

Those trips are over 5 years ago. I checked with the airline, but they don't have any record.

Any tips please? Thank you!
3 answers 3