Olson 2011b tzdata.
* northamerica Add America/North_Dakota/Beulah (Mercer County, North Dakota,
moved from Mountain to Central time at end of DST in 2010);
use actual version number rather than "%W%".
need update with latest Olson 2011b tzdata.
tzdata2011b has been released on Mon, 07 Feb 2011 08:46:59 -0500. Added a new time zone:
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
-7:00 US M%sT 2010 Nov 7 2:00
-6:00 US C%sT