Judaism.See also:The origins of Purim
Purim
Purim is part of Judaism. Hassidim keep Purim just like other Jews.
There is no opposition in Judaism between Purim and Hanukkah.
The holiday of Purim always begins on the evening of a full moon, but there is no such term as a purim moon within Judaism.
There is no such holiday called 'Haman'. Haman is a character in the story of Purim.
Oh, dude, Shushan Purim is like the afterparty for Purim, but in the ancient city of Shushan. It's when the peeps in walled cities celebrate Purim a day later because they were too busy defending their walls on the regular Purim day. So, it's like Purim, but fashionably late.
sunday
Purim is a single day, both in Israel and in the rest of the world.
Purim 2009 is Tuesday, March 10, in almost every place in the world. Jerusalem celebrates Purim one day later.
Purim is the 14th of Adar. Shushan Purim (Purim celebrated in walled cities from the time of Joshua) is on the 15th day of Adar. This is when Purim is celebrated today in Jerusalem. Note, that depending when these dates fall out with respect to the Shabbat, the observation of the day's mitzvot may be moved up so as not to conflict with the Shabbat.
Through the reading of the book of Esther and the observance of the Purim festival.