In message id, Dr J R
Stockton wrote:
Perhaps you already know that Summer Time in Brazil uses a rule similar
to that of the EU, but with the end deferred for a week if otherwise it
would finish on Carnival Sunday, the Sunday before Lent, which is linked
to Easter Sunday, the calculation of which we have discussed previously.
My http://www.merlyn.demon.co.uk/js-date5.htm#SLGD now offers São
Paulo time, allowing for that - does anywhere else do anything similar?

Lots of countries have rules that adjust for Ramadan or other similar
festivals. See the tz database notes.

--
Clive D.W. Feather | Home:
Mobile: +44 7973 377646 | Web: http://www.davros.org
Please reply to the Reply-To address, which is:

In uk.transport.london message ,
Fri, 4 Apr 2014 21:38:46, Clive D. W. Feather posted:

In message id, Dr J
R Stockton wrote:
Perhaps you already know that Summer Time in Brazil uses a rule similar
to that of the EU, but with the end deferred for a week if otherwise it
would finish on Carnival Sunday, the Sunday before Lent, which is linked
to Easter Sunday, the calculation of which we have discussed previously.
My http://www.merlyn.demon.co.uk/js-date5.htm#SLGD now offers São
Paulo time, allowing for that - does anywhere else do anything similar?

Lots of countries have rules that adjust for Ramadan or other similar
festivals. See the tz database notes.

I would not dream of considering Ramadan as similar to Easter!!! Not,
for that matter, Yom Kippur, which (when I last looked) governs the end
of Israel Summer Time - Israel is the only example I recall of having a
long-term Summer Time rule which cannot be sustained perpetually on
purely numeric grounds.

I did mean systematic modification to the sort of rules that a UNIX TZ
string can handle, rather than /ad hoc/ rules or a "decide each year"
system, such as Syria seems to have - especially if Easter-related.

--
(c) John Stockton, nr London, UK. Mail via homepage. Turnpike v6.05 MIME.
Web http://www.merlyn.demon.co.uk/ - FAQqish topics, acronyms and links;
Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.

On 05/04/2014 12:54, Dr J R Stockton wrote:
In uk.transport.london message ,
Fri, 4 Apr 2014 21:38:46, Clive D. W. Feather posted:

In message id, Dr J
R Stockton wrote:
Perhaps you already know that Summer Time in Brazil uses a rule similar
to that of the EU, but with the end deferred for a week if otherwise it
would finish on Carnival Sunday, the Sunday before Lent, which is linked
to Easter Sunday, the calculation of which we have discussed previously.
My http://www.merlyn.demon.co.uk/js-date5.htm#SLGD now offers São
Paulo time, allowing for that - does anywhere else do anything similar?

Lots of countries have rules that adjust for Ramadan or other similar
festivals. See the tz database notes.

I would not dream of considering Ramadan as similar to Easter!!!

Why not? It's based on a lunar calendar.


--
Graeme Wall
This account not read, substitute trains for rail.
Railway Miscellany at http://www.greywall.demon.co.uk/rail

"Graeme Wall" wrote in message ...

On 05/04/2014 12:54, Dr J R Stockton wrote:
In uk.transport.london message ,
Fri, 4 Apr 2014 21:38:46, Clive D. W. Feather posted:

In message id, Dr J
R Stockton wrote:
Perhaps you already know that Summer Time in Brazil uses a rule similar
to that of the EU, but with the end deferred for a week if otherwise it
would finish on Carnival Sunday, the Sunday before Lent, which is linked
to Easter Sunday, the calculation of which we have discussed previously.
My http://www.merlyn.demon.co.uk/js-date5.htm#SLGD now offers São
Paulo time, allowing for that - does anywhere else do anything similar?

Lots of countries have rules that adjust for Ramadan or other similar
festivals. See the tz database notes.

I would not dream of considering Ramadan as similar to Easter!!!

Why not? It's based on a lunar calendar.

---------------------------------------------------

Though AIUI, it continues to move forwards through the year.

It doesn't "jump back" 28 days ones it has passed some nominal point

tim

In article ,
(Graeme Wall) wrote:

On 05/04/2014 12:54, Dr J R Stockton wrote:
In uk.transport.london message ,
Fri, 4 Apr 2014 21:38:46, Clive D. W. Feather
posted:

In message id, Dr J
R Stockton wrote:
Perhaps you already know that Summer Time in Brazil uses a rule
similar to that of the EU, but with the end deferred for a week if
otherwise it would finish on Carnival Sunday, the Sunday before Lent,
which is linked to Easter Sunday, the calculation of which we have
discussed previously. My
http://www.merlyn.demon.co.uk/js-date5.htm#SLGD now offers São
Paulo time, allowing for that - does anywhere else do anything
similar?

Lots of countries have rules that adjust for Ramadan or other similar
festivals. See the tz database notes.

I would not dream of considering Ramadan as similar to Easter!!!

Why not? It's based on a lunar calendar.

Doesn't it depend on human observations at the relevant times?

--
Colin Rosenstiel

In uk.transport.london message LIOdnRqly5Ad_dzOnZ2dnUVZ8tudnZ2d@giganew
s.com, Sun, 6 Apr 2014 09:11:12, posted:

In article ,
(Graeme Wall) wrote:

On 05/04/2014 12:54, Dr J R Stockton wrote:
In uk.transport.london message ,
Fri, 4 Apr 2014 21:38:46, Clive D. W. Feather
posted:

In message id, Dr J
R Stockton wrote:
Perhaps you already know that Summer Time in Brazil uses a rule
similar to that of the EU, but with the end deferred for a week if
otherwise it would finish on Carnival Sunday, the Sunday before Lent,
which is linked to Easter Sunday, the calculation of which we have
discussed previously. My
http://www.merlyn.demon.co.uk/js-date5.htm#SLGD now offers São
Paulo time, allowing for that - does anywhere else do anything
similar?

Lots of countries have rules that adjust for Ramadan or other similar
festivals. See the tz database notes.

I would not dream of considering Ramadan as similar to Easter!!!

Why not? It's based on a lunar calendar.

Doesn't it depend on human observations at the relevant times?


It's worse than that - it is not defined in exactly the same way in all
Muslim countries, and it can depend on the longitude, latitude, and
weather. And the rules get changed fairly often too.

However, ISTM that most Muslim countries do not need Summer Time, though
some have it.

A country that observes Ramadan really ought to write its Summer Time
rules using the Islamic calendar ...

--
(c) John Stockton, nr London, UK. E-mail, see Home Page. Turnpike v6.05.
Website http://www.merlyn.demon.co.uk/ - w. FAQish topics, links, acronyms
PAS EXE etc. : http://www.merlyn.demon.co.uk/programs/ - see in 00index.htm
Dates - miscdate.htm estrdate.htm js-dates.htm pas-time.htm critdate.htm etc.