[tz] [PROPOSED] Cite US DST legislation

[walter harms]

Am 04.06.2019 09:08, schrieb Paul Eggert:
> * northamerica: Cite all the US federal DST legislation.
> (US): Adjust table to match the legislation more closely.
> This does not affect the TZif output files.
> ---
>  northamerica | 26 ++++++++++++++++++++------
>  1 file changed, 20 insertions(+), 6 deletions(-)
> 
> diff --git a/northamerica b/northamerica
> index 65827ec..52898de 100644
> --- a/northamerica
> +++ b/northamerica
> @@ -93,10 +93,24 @@
>  # was the first nationwide legal time standard, and apparently
>  # time was just called "Standard Time" or "Daylight Saving Time".
>  
> -# From Arthur David Olson:
> -# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
> -# See, for example, the front page of the Saturday, 1974-10-26
> -# and Sunday, 1974-10-27 editions of the Washington Post.
> +# From Paul Eggert (2019-06-04):
> +# Here is the legal basis for the US federal rules.
> +# * Public Law 65-107 (1918-03-19) implemented standard and daylight saving
> +#   time for the first time across the US, springing forward on March's last
> +#   Sunday and falling back on October's last Sunday.
> +# * Public Law 66-40 (1919-08-20) repealed DST on October 1919's last Sunday.
> +# * Public Law 77-403 (1942-01-20) started wartime DST on 1942-02-09.
> +# * Public Law 79-187 (1945-09-25) ended wartime DST on 1945-09-30.
> +# * Public Law 89-387 (1966-04-13) reinstituted a national standard for DST,
> +#   from April's last Sunday to October's last Sunday, effective 1967.
> +# * Public Law 93-182 (1973-12-15) moved the 1974 spring-forward to 01-06.
> +# * Public Law 94-434 (1974-10-05) moved the 1975 spring-forward to
> +#   February's last Sunday.
> +# * Public Law 99-359 (1986-07-08) moved the spring-forward to April's first
> +#   Sunday.
> +# * Public Law 109-50 (2005-08-08), effective 2007, moved the spring-forward
> +#   to March's second Sunday and the fall-back to November's first Sunday.
> +# All transitions are at 02:00 local time.
>  

Historical interesting, ntl i would only cite the current ruling here.
Everything else can go to a different file otherwise this will be a big
burden to maintain, add non vital information and increase size without need.

just my 2 cents,
re,
 wh


>  # From Arthur David Olson:
>  # Before the Uniform Time Act of 1966 took effect in 1967, observance of
> @@ -152,11 +166,11 @@ Rule	US	1918	1919	-	Mar	lastSun	2:00	1:00	D
>  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	lastSun	2:00	0	S
> +Rule	US	1945	only	-	Sep	30	2:00	0	S
>  Rule	US	1967	2006	-	Oct	lastSun	2:00	0	S
>  Rule	US	1967	1973	-	Apr	lastSun	2:00	1:00	D
>  Rule	US	1974	only	-	Jan	6	2:00	1:00	D
> -Rule	US	1975	only	-	Feb	23	2:00	1:00	D
> +Rule	US	1975	only	-	Feb	lastSun	2:00	1:00	D
>  Rule	US	1976	1986	-	Apr	lastSun	2:00	1:00	D
>  Rule	US	1987	2006	-	Apr	Sun>=1	2:00	1:00	D
>  Rule	US	2007	max	-	Mar	Sun>=8	2:00	1:00	D