2011-03-30  Craig Howland <howland@LGSInnovations.com>

	* libc/time/strptime.c:  Initialize given struct tm before use;
	move application of %U, %W, and %V formats to the end so that have
	a valid year to use first; re-write first_day() helper function
	to be faster for large values and to work for year < 1970; limit
	year to 1753 or later.