On 7/17/2026 9:33 AM, Arthur Olson via tz wrote:
Rather than choosing between EST and EDT going forward: EPDT (for Eastern Permanent Daylight Time).
One benefit of using "EDT" going forward (beyond the RFC 822 and GNU issues discussed) is that it would serve as a reminder that the area is already on "permanent DST".
I have seen some Canadian news articles that correctly note Saskatchewan moved to permanent DST in 1960 (MST/MDT changed to CST in tzData). Other articles and the province of Manitoba state that Saskatchewan is on permanent standard time (which they are if one accepts solar noon as being around 1pm clock time).
I wonder how many people remember that Yukon (America/Whitehorse) started out as UTC-09 and moved to permanent DST in 1966? (YST/YDT changed to PST in tzData.) Then 14 years later they added DST on top of their "permanent DST" (PST/PDT) before transitioning to a second level of "permanent DST" in 2020 (PST/PDT to MST). Solar noon around 2pm clock time. "YDDT" year round?
Humor aside, the US proposal clearly states the official names will be "standard time". Several provinces in Canada were willing to to move in coordination with the United States. Yukon decided not to wait for BC and the US in 2020 and BC gave up on waiting for the US earlier this year. I expect that if the US proposal passes it won't be long until the Canadian provinces synchronize.
