Hi Sven,
i completely agree my monday is not necessarily your monday, but my
monday is my monday independently of when i initiate it. my monday (a
few days ago) does _not begin at another utc because of a dst change in
the meantime. this behaviour could result in additional problems, apart
from Petrs, eg in a program that wants to calc the position of a star
for a certain date & time.
werner
On 03/26/2017 10:14 PM, Sven Van Caekenberghe wrote:
On 26 Mar 2017, at 21:56, Stephane Ducasse <stepharo.s...@gmail.com> wrote:
Did you check the Zn counterpart because I know that some parts are much better.
But I do not have them at hand.
You mean ZTimestamp (but it is not a part of Zinc HTTP Components).
https://github.com/svenvc/ztimestamp
This is an UTC, second precision timestamp without TZ info, and a number of
interesting tools.
However, that won't solve the issue raised. Some people think of a date as an
abstract calendar date, while for others its a concrete day (my Monday is not
your Monday if we are in different time zones).
I don't think there is only one solution, both roles are needed/useful.
Note that STON serialises Dates as YYYY-MM-DD which is what you seem to want.
The ZTimezone class knows about the exact transitions, but that still does not
mean that no weird things happen at the transition point, au contraire ;-)
Stef
On Sun, Mar 26, 2017 at 10:17 AM, Petr Fischer <petr.fisc...@me.com> wrote:
Hello,
1) when I create date on: 2017/03/20 (before Daylight Saving Time change) with
this code:
D1 := Date year: 2017 month: 3 day: 26.
Date object is created with instvars:
start: 2017-03-26T00:00:00+01:00
duration: 1:00:00:00
2) when I create same Date instance with the same code on/after: 2017/03/26
(after Daylight Saving Time change):
D2 := Date year: 2017 month: 3 day: 26.
Date instance with this instvars returned:
start: 2017-03-26T00:00:00+02:00
duration: 1:00:00:00
3) D1 != D2
So, for example: persisted instance of date (Date year: 2017 month: 3 day: 26)
created before DST change is not equal with date instance (Date year: 2017
month: 3 day: 26) created after DST change.
DST change breaks equality of the same date :(
Is it OK?
Thanks! Petr Fischer
