Question about "only" RULE lines

[Paul Eggert]

"David Braverman" <david at inner-drive.com> writes:

> ...
> Rule US 1918 1919 - Oct lastSun 2:00 0 S
> Rule US 1942 only - Feb 9 2:00 1:00 W # War
> Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
> Rule US 1945 only - Sep 30 2:00 0 S
> ...

> I can't tell what rule to follow from 1942-01-01 to 1942-02-19, then
> from 1943-01-01 to 1945-08-14.

I'd say it's the last US rule in effect, which is 1919 Oct lastSun at 2:00,
i.e., standard time.

You can debug your understanding by using the command
"zdump -v America/Chicago".