and I found this site as well, which pretty much reminds us that the hebrew day is different, and goes sunset to sunset, not midnite to midnite and a few other things, like the high day sabbath being different that redlemon mentioned
http://www.biblebelievers.org.au/bb980603.htm
it also has a chart illustrating the Six Days Before Passover in Hebrew Time and "Three Nights and Three Days Jesus was in the heart of the Earth"