Passover always begins on the same date on the Hebrew calendar: the 14th of Nissan.
The holiday of Passover officially begins on the evening of Monday, March 25th (in 2013). Most people who celebrate Passover will have a seder either on the 25th or the 26th.
Passover begins about a month after Purim
Passover 2014 begins the evening of Monday, April 14th and ends the evening of Tuesday, April 22nd.
In the Hebrew calender, Passover or Pesach begins on the fifteenth of Nisan. This year (2010) it begins in the evening of March 30th. Either March or April
rid their households of all leaveaned products
Passover begins on Saturday evening, April 19, with the first Seder. The last day of Passover in Israel is Saturday April 26, and outside of Israel is Sunday, April 27. It is unusual for Passover to begin immediately following Shabbat.
it begins at nightfall of the end of "Pesak
It was the Passover evening meal. He was crucified on the Passover day as in Jewish tradition, a day begins and ends at sunset.
Begins evening of April 8 (April 9) and lasts 8 days outside of Israel, or 7 days inside Israel
Passover starts on the 15th of Nisan which falls either in March or April.
The dates of Passover (or Pesach, as we Jews call it) doesn't need to be calculated like the dates of Easter because it always begins on the same day on the Hebrew calendar - 14 Nisan.