[tz] Relative to Beginning of Month or to End
Marvel, Jim (CPCOE)
Jim.Marvel at honeywell.com
Fri Jul 6 18:10:11 UTC 2012
I see it in the Rules files now, like "europe". Thanks also for the GNU-tip.
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jim.marvel at honeywell.com
>>From: Paul Eggert [mailto:eggert at cs.ucla.edu]
>>Sent: Friday, July 06, 2012 2:01 PM
>>To: Marvel, Jim (CPCOE)
>>Cc: tz at iana.org
>>Subject: Re: [tz] Relative to Beginning of Month or to End
>>On 07/06/2012 08:55 AM, Marvel, Jim (CPCOE) wrote:
>>> Did a zdump. How to tell if timezone DST rules indicate counting
>>> relative to beginning of month ("2nd Tuesday") or to end of month
>>> (last Sunday for example).
>>> Does this info live in the source code?
>>That info does not live in the data given to zdump.
>>It does live in the original source for that data, i.e., the source fed
>>to zic. But zic discards it and it is not present in zic's output
>>(i.e., in zdump's input).
>>There is software that reverse-engineers the zic output and attempts to
>>infer that info. It's not perfect, but it works fairly well in
>>practice, at least for future time stamps where there is typically only
>>one rule into the indefinite future. See the function calendar-time-
>>zone-daylight-rules in GNU Emacs; there may be other examples but this
>>is the one I'm familiar with.
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