Lev 23:32 It is a sabbath of rest to you, and ye have humbled yourselves in the ninth of the month at even; from evening till evening ye do keep your sabbath.'That states the time of day....not the start and end of the day.
You do not comprehend history (here a willful ignorance because your faith hinges on knowing these exact dates....as you said you cannot view the crucifixion as a historical event without knowing the exact date).
So believe as you will. Just stop objecting when others who actually study and know a bit more history and facts disagree with you.
Gen 1:5,8 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
And God called the firmament Heaven. And the evening and the morning were the second day.