Dear Sakaguchi sensei,
I agree with your suggestion. Therefore, I will stay for short term stay from 18 January to 16 April (90 days).
My departure flight (from Bangkok) will be on 17 January and I will be in Japan on 18 January.
My arrival flight (to Bangkok) will be on 17 April at 0.20 (I will be at the airport on 16 April in the night) and I will be in Thailand on 17 April in the morning.