Whenever I start a mission / challenge, the date gets reset to 2022-08-15, even though the challenges have a completely different date:
Code: custom_missions.tmc
<[tm_time_utc][time][]
<[int32][time_year][2021]>
<[int32][time_month][7]>
<[int32][time_day][12]>
<[float64][time_hours][20]>
>This is kind of sad, because this changes the position of the sun to this very day; challenges will never show the daylight conditions of the day stored in the custom_missions.tmc. So you no one else will ever see Carl's midwinter ride to Åland. 
(I know there is no way to actually set the date in Aerofly FS4, even though it can be set in the main.mcf; but maybe some controls in the dialogue for setting the time would fix this problem? A simple slider to at least set the day of the year?)