Added Pacific Time Zone prior to addition of peninsular Alaska

Removed invalid role from chronology relation

Added changes to U.S. time zone boundaries from 1967 to 1970

Choteau Co., SD ≠ Perkins Co., SD

Greasewood Co., UT ≠ Box Elder Co., UT

Wabash New Purchase Co., IN ≠ Wabash Co., IN; expanded abbreviations in county names

Wallace Co., ND ≠ Wallace Co., KS

Corrected geometry of Mountain Time Zone prior to western Jones Co., SD, being moved from Mountain to Central Time Zone; City of Murdo has been in Central the whole time

Corrected geometry of Mountain Time Zone prior to Mercer Co., ND, being moved from Mountain to Central Time Zone

USDOT time zone dataset incorrectly follows a line over 13 miles to the east of the range line that forms the eastern boundary of Menominee, Michigan

Added changes to U.S. time zone boundaries from 1970 to 1980

Added changes to U.S. time zone boundaries from 1980 to 2000

Fixed typo in note

Corrected start date

Deleted redundant elements caused by impatient partial reupload of changeset 112709

Added changes to U.S. time zone boundaries from 2000 to present

Morton Co., NE ≠ Norton Co., ND

Distinguish between extinct and extant Todd counties in South Dakota

White River Co. ≠ Mellette Co.

Jones Co., NE ≠ Jones Co., SD