Question on interpretation of rules intervals
Hi all, I have a question about how to interpret the US set of rules. After going through the "zic" man page and the mailing list archive I am still unclear about the meaning of using this: [...] 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 [...] in a zone definition like this: Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 -5:00 US E%sT 1920 -5:00 NYC E%sT 1942 -5:00 US E%sT 1946 [...] As I see it, the US rule has a transition in 1942 (only), on Feb 9th, where it saved 1 hour. Am I correct in interpreting the gap of 43-44 as: 1. The transition of 1942 was observed up until 1945, Sep 30th, and... 2. The entry for Aug 14th, 1945 transition exists only in order to be used in time zones which did not observe the 1942 transition? Thanks, Liviu
Starting in 1942, the U.S. observed Daylight Saving Time year-round as part of a war-time effort to conserve energy; rather than being called "Standard" or "Daylight" time, it was called "War" time (as in "Eastern War Time"). WWII ended during the summer of 1945, when Daylight Saving Time would normally be observed; folks started using "Peace" rather than "War" in time zone names (such as "Eastern Peace Time"). When the normal "fall back" date arrived in 1945, folks reverted to "Eastern Standard Time" (and to "Eastern Daylight Time" in 1946). So...there's one rule in 1942 to get things on to "War" time (in effect through 1945, with no clock changes), one rule in 1945 to get things on to "Peace" time, and one rule in 1945 to "fall back" to standard time. --ado -----Original Message----- From: Liviu Nicoara [mailto:nicoara@roguewave.com] Sent: Monday, April 02, 2007 10:17 AM To: tz@lecserver.nci.nih.gov Subject: Question on interpretation of rules intervals Hi all, I have a question about how to interpret the US set of rules. After going through the "zic" man page and the mailing list archive I am still unclear about the meaning of using this: [...] 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 [...] in a zone definition like this: Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 -5:00 US E%sT 1920 -5:00 NYC E%sT 1942 -5:00 US E%sT 1946 [...] As I see it, the US rule has a transition in 1942 (only), on Feb 9th, where it saved 1 hour. Am I correct in interpreting the gap of 43-44 as: 1. The transition of 1942 was observed up until 1945, Sep 30th, and... 2. The entry for Aug 14th, 1945 transition exists only in order to be used in time zones which did not observe the 1942 transition? Thanks, Liviu
Please cancel my message then, you explained it better than I could have. J Andrew Lipscomb, CPA*ABV, ASA Decosimo Corporate Finance 900 Tallan Building 2 Union Square Chattanooga, TN 37402 423.756.7100 Fax 423.266.6671 www.dcf.decosimo.com -----Original Message----- From: Olson, Arthur David (NIH/NCI) [E] [mailto:olsona@dc37a.nci.nih.gov] Sent: Mon 2 April 2007 10:26 To: tz@lecserver.nci.nih.gov Subject: RE: Question on interpretation of rules intervals Starting in 1942, the U.S. observed Daylight Saving Time year-round as part of a war-time effort to conserve energy; rather than being called "Standard" or "Daylight" time, it was called "War" time (as in "Eastern War Time"). WWII ended during the summer of 1945, when Daylight Saving Time would normally be observed; folks started using "Peace" rather than "War" in time zone names (such as "Eastern Peace Time"). When the normal "fall back" date arrived in 1945, folks reverted to "Eastern Standard Time" (and to "Eastern Daylight Time" in 1946). So...there's one rule in 1942 to get things on to "War" time (in effect through 1945, with no clock changes), one rule in 1945 to get things on to "Peace" time, and one rule in 1945 to "fall back" to standard time. --ado -----Original Message----- From: Liviu Nicoara [mailto:nicoara@roguewave.com] Sent: Monday, April 02, 2007 10:17 AM To: tz@lecserver.nci.nih.gov Subject: Question on interpretation of rules intervals Hi all, I have a question about how to interpret the US set of rules. After going through the "zic" man page and the mailing list archive I am still unclear about the meaning of using this: [...] 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 [...] in a zone definition like this: Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 -5:00 US E%sT 1920 -5:00 NYC E%sT 1942 -5:00 US E%sT 1946 [...] As I see it, the US rule has a transition in 1942 (only), on Feb 9th, where it saved 1 hour. Am I correct in interpreting the gap of 43-44 as: 1. The transition of 1942 was observed up until 1945, Sep 30th, and... 2. The entry for Aug 14th, 1945 transition exists only in order to be used in time zones which did not observe the 1942 transition? Thanks, Liviu
Ahh -- obviously. Thank you all. Olson, Arthur David (NIH/NCI) [E] wrote:
Starting in 1942, the U.S. observed Daylight Saving Time year-round as part of a war-time effort to conserve energy; rather than being called "Standard" or "Daylight" time, it was called "War" time (as in "Eastern War Time").
WWII ended during the summer of 1945, when Daylight Saving Time would normally be observed; folks started using "Peace" rather than "War" in time zone names (such as "Eastern Peace Time").
When the normal "fall back" date arrived in 1945, folks reverted to "Eastern Standard Time" (and to "Eastern Daylight Time" in 1946).
So...there's one rule in 1942 to get things on to "War" time (in effect through 1945, with no clock changes), one rule in 1945 to get things on to "Peace" time, and one rule in 1945 to "fall back" to standard time.
--ado
-----Original Message----- From: Liviu Nicoara [mailto:nicoara@roguewave.com] Sent: Monday, April 02, 2007 10:17 AM To: tz@lecserver.nci.nih.gov Subject: Question on interpretation of rules intervals
Hi all,
I have a question about how to interpret the US set of rules. After going through the "zic" man page and the mailing list archive I am still
unclear about the meaning of using this:
[...] 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 [...]
in a zone definition like this:
Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 -5:00 US E%sT 1920 -5:00 NYC E%sT 1942 -5:00 US E%sT 1946 [...]
As I see it, the US rule has a transition in 1942 (only), on Feb 9th, where it saved 1 hour. Am I correct in interpreting the gap of 43-44 as:
1. The transition of 1942 was observed up until 1945, Sep 30th, and... 2. The entry for Aug 14th, 1945 transition exists only in order to be used in time zones which did not observe the 1942 transition?
Thanks, Liviu
And yet another question also related to the war years: [...] Rule US 1942 only - Feb 9 2:00 1:00 W # War Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace [...] Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 -7:00 US M%sT 1944 Jan 1 00:01 -7:00 - MST 1944 Apr 1 00:01 -7:00 US M%sT 1944 Oct 1 00:01 [...] When Phoenix reverted from not observing any DST rules for the interval Jan to Apr 1944 to observing US rules after Apr 1st 1944, does that mean that the DST offset in effect in US (1 hour) introduced in Feb 1942 comes into effect once again for Phoenix? I.e., did Arizona/Phoenix observe: ... 1944 Apr 1st 00:00:58 MST 1944 Apr 1st 00:00:59 MST 1944 Apr 1st 01:01:00 MWT (War time) 1944 Apr 1st 01:01:01 MWT 1944 Apr 1st 01:01:02 MWT ... ? Could you please confirm that my interpretation is correct? Thanks, Liviu
Here's how I interpret it: "War Time" (1 hour advanced) stayed in effect from Feb 9, 1942, through 1943 and 1944 and into 1945. On August 14, 1945, the name (only) changed from "War Time" to "Peace Time", since hostilities had ended. The time was still one hour advanced. This continued until September 30, 1945, when Standard Time resumed. Martin -----Original Message----- From: Liviu Nicoara [mailto:nicoara@roguewave.com] Sent: Monday, April 02, 2007 10:17 AM To: tz@lecserver.nci.nih.gov Subject: Question on interpretation of rules intervals Hi all, I have a question about how to interpret the US set of rules. After going through the "zic" man page and the mailing list archive I am still unclear about the meaning of using this: [...] 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 [...] in a zone definition like this: Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 -5:00 US E%sT 1920 -5:00 NYC E%sT 1942 -5:00 US E%sT 1946 [...] As I see it, the US rule has a transition in 1942 (only), on Feb 9th, where it saved 1 hour. Am I correct in interpreting the gap of 43-44 as: 1. The transition of 1942 was observed up until 1945, Sep 30th, and... 2. The entry for Aug 14th, 1945 transition exists only in order to be used in time zones which did not observe the 1942 transition? Thanks, Liviu
-----Original Message----- From: Liviu Nicoara [mailto:nicoara@roguewave.com] Sent: Mon 2 April 2007 10:17 To: tz@lecserver.nci.nih.gov Subject: Question on interpretation of rules intervals Hi all, I have a question about how to interpret the US set of rules. After going through the "zic" man page and the mailing list archive I am still unclear about the meaning of using this: [...] 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 [...] in a zone definition like this: Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 -5:00 US E%sT 1920 -5:00 NYC E%sT 1942 -5:00 US E%sT 1946 [...] As I see it, the US rule has a transition in 1942 (only), on Feb 9th, where it saved 1 hour. Am I correct in interpreting the gap of 43-44 as: 1. The transition of 1942 was observed up until 1945, Sep 30th, and... 2. The entry for Aug 14th, 1945 transition exists only in order to be used in time zones which did not observe the 1942 transition? Thanks, Liviu Part 1, correct. The New York zone remained on Eastern War Time (-4:00) for all of 1943 and 1944. Part 2, that change did not change the actual offset, which remained -4. It only changed the letter used in the abbreviation (since the US was no longer at war). It was indeed meant to be applied in all places using the US rule.
participants (4)
-
Andy Lipscomb -
Liviu Nicoara -
Moore, Martin -
Olson, Arthur David (NIH/NCI) [E]