I think Easter is the following Sunday after Passover.
In 2013, Passover began on the evening of March 25th.
April 23rd...
passover 60ad
Passover always begins on the same date on the Hebrew calendar: the 14th of Nissan.
Shavuoth is the fiftieth day after the second day of Passover.
It is set on the table during the Passover seder (the first and second nights of passover).
In 1998, April 11th was Shabbat and also the first day of Passover. It happens, but not very often.
Monday, March 29th at Sundown.
Yes, for most sects of Judaism.
March 25 - April 2 in 2013.
As soon a passover ends, leavened foods are again permissible, subject to other general kosher laws.