While the Bible states that Jesus rose on the first day of the week, the day that he was crucified is not mentioned. Traditionally Christians celebrate the death of Jesus on a Friday and the resurrection on a Sunday.
But in Matthew 12:40 Jesus specifically mentions “three days and three nights.”
Matt 12:40 (ASV) for as Jonah was three days and three nights in the belly of the whale; so shall the Son of man be three days and three nights in the heart of the earth.
This statement by Jesus points to his death being on a Wednesday or Thursday as you cannot get 3 days and 3 nights between Friday afternoon and Sunday morning.