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 at 23.15 and I will be in Tokyo on 18 January at 6.55.
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 Bangkok on 17 April in the morning.
The university approved the financial support for 90-day short term stay.