[tz] UTC calculation for March 12, 3001 [IANA #1143241], [PR 9419866]
eggert at cs.ucla.edu
Wed May 22 17:07:25 UTC 2019
On 5/21/19 12:04 PM, Lasher, Beth wrote:
> In the year 3001, Daylight Savings time is applied on Sunday March 9, 3001 as expected.
In the Gregorian calendar March 9, 3001 is expected to be a Monday. So
there seem to be some sort of glitch in your calculations.
> (Eastern Standard time). BUT on the following Thursday, March 12, 3001 at 3 am, it seems that another Daylight Savings Time change is applied. After March 12, 3001, the UTC time zone offset for Eastern Daylight Savings Time is 3 hours (not 4) and remains that way until the year 9999. Is this correct? What is the cause of this second time offset change?
I don't see that behavior with the current development sources. Here's
the output that I get for the command "zdump -i -c3001,3002
- - -05 EST
3001-03-08 03 -04 EDT 1
3001-11-01 01 -05 EST
If you're seeing something different for the zdump command, please let
us know. If you're using some other software, you can investigate how
that software is using tzdata and/or the Gregorian calendar.
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