October
Yes, the 30th of April and the 31st of December are always on the same day of the week in any year.
The thirty-first week of the year 2011 falls between the dates July 25 - 31.
May 31st or May 30th in a leap year.
January 1, 2011 was a Saturday. Counting from the 2nd, the start of the 30th week was July 24th.
No, Halloween is on October 31st of every year.
This year (2008) It was on the 30th, 31st of July and the 1st of August.
I'm pretty sure it's a Monday feel free to check a calender or correct me
August 31st is the 243rd day of a non-leap year. In a leap year, August 30th is the 243rd day of the year.
The 90th day of a regular year is the 31st of March (the 90th day of a leap year is the 30th of March).
Normally it is the 31st of May of the following year. If the following year is a leap year, then it would be the 30th of May.
Halloween was on Monday, October 31st in the year 2011.
It depends what year you're asking about. April 30th 2013 was a Tuesday.