There's way more than you ever wanted to read about this at
The Good Friday-Easter Sunday Question. The short answer on that page appears to be
Quote:
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Christ died near 3 p.m. and was placed in the tomb near sunset that day—a Wednesday in 31. That evening began the "high day" Sabbath, the first day of the Feast of Unleavened Bread, which fell on Thursday that year.
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I'd thought about it before as well, but never went further to try to research it for myself.