1) If someone is in Yerusholayim @Sunrise on Adar [Sheni] 15th, s/he must observe all laws of Purim, even if person spent the previous evening outside Yerusholayim, s/he must somehow still hear Megilla on nite of 15th, and if person departs Yerusholayim immediately after sunrise on 15th, person must still keep all 4 Mitzvos of Purim even outside Yerusholayim, on the 15th.
2) 2028 & 2031, daylights savings shall again commence on Purim [except of-course for Arizona, Hawaii, Puerto Rico, Saskatchewan who were so smart not to adopt this Chukas haGoy].