Here's the soon to be screwed up definition of US time zones. 15 USC 261 says For the purpose of establishing the standard time of the United States, the territory of the United States shall be divided into nine zones in the manner provided in this section. Except as provided in section 260a(a) of this title, the standard time of the first zone shall be Coordinated Universal Time retarded by 4 hours; that of the second zone retarded by 5 hours; that of the third zone retarded by 6 hours; that of the fourth zone retarded by 7 hours; that of the fifth zone retarded 8 hours; that of the sixth zone retarded by 9 hours; that of the seventh zone retarded by 10 hours; that of the eighth zone retarded by 11 hours; and that of the ninth zone shall be Coordinated Universal Time advanced by 10 hours. 15 USC 263 says: The standard time of the first zone shall be known and designated as Atlantic standard time; that of the second zone shall be known and designated as eastern standard time; that of the third zone shall be known and designated as central standard time; that of the fourth zone shall be known and designated as mountain standard time; that of the fifth zone shall be known and designated as Pacific standard time; that of the sixth zone shall be known and designated as Alaska standard time; that of the seventh zone shall be known and designated as Hawaii-Aleutian standard time; that of the eighth zone shall be known and designated as Samoa standard time; and that of the ninth zone shall be known as Chamorro standard time. Section 260a currently has the daylight saving rule, advance in March, fall back in November. The bill passed by the Senate deletes 260a, and updates 261 to change each of the numbers by an hour, 4 changes to 3, 5 to 4, and so forth 11 changes to 10 and the final 10 changes to 11. But it does *not* change section 263. This means that the official US names of the time zones change, which is really stupid. Since Hawaii, Samoa, and Guam do not use daylight time, Hawaii will now be in Alaska standard time, Samoa in Hawaii-Aleutian standard time, and Guam in a time zone with no name. I hope the House will fix this if they take up the bill, but I wouldn't make any changes to my time zone files yet. With respect to Canada, history shows that their timezones follow the US so if the US make a change like this, a bill in Ottawa will change Canada to match. There are currently places where you change time when you cross the border, like between Maine and New Brunswick, but it would be too painful for Montreal and Toronto and Windsor not to match New York and Detroit, and Vancouver not to match Seattle. R's, John