Q: If my calender shows fasting time starts at 4:01 do i start at 4:01? If end time is 9:05, what do i do?

A: Best to start 3 to 5 minutes prior to the sohoor.

Maximum wait time would be 2 to 3 minutes for the iftar.

Both times are sacred, so kindly use the time to make Dua.

Allah Certainly Knows Best.