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Date: Mon, 02 Apr 2012 12:07:23 +0200
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Subject: Re: [PHP-DEV] Addition of calendar to intl
From: glopes@nebm.ist.utl.pt ("Gustavo Lopes")

On Mon, 02 Apr 2012 11:44:17 +0200, Derick Rethans <derick@php.net> wrot=
e:

> On Mon, 2 Apr 2012, Johannes Schl=C3=BCter wrote:
>> Basically it is good to have those calender stuff available. I wonder=

>> how this relates to our datelib. Can this somehow be integrated, at
>> least for Gregorian calender times, so one can easily convert from on=
e
>> to the other etc.? Ideally we'd just have one API :-)

We could surely add functions that convert between DateTime and  =

IntlCalendar objects (there would be some issues on how tightly the time=
  =

zones could be integrated; see below). But to have one API is basically =
 =

near impossible given that PHP does not depend itself on ICU.

> Sadly, when I looked at it last time, the ICU stuff insistent on havin=
g
> a timestamp only as input to their formatting functionality :-/ We'd
> need to use a few things on the ext/date side to get ICU locale
> formatting into the date/time stuff.
>

This is not about formatting. This is about these kind of date  =

calculations:
* converting timestamps to dates and vice-versa (but not in a human  =

readable fashion, locales affect only the calendar type and minor stuff =
 =

like when the week or weekend start; you get the date fields by method  =

calls such as $cal->get(IntlCalendar::FIELD_HOUR_OF_DAY)).
* Adding and rolling amounts to fields.
* Calculating field differences.
* Determine weekend onsets and offsets.

The formatting and parsing of dates is done with IntlDateFormatter, whic=
h  =

accepts DateTime objects, though this "integration" with the date  =

extension could possibly be improved.

Going a bit off-topic:

I think the problem you have with datefmt_format is that the time zone i=
s  =

specified through the formatter and the one of DateTime is ignored. One =
 =

could add a new function that creates a formatter with the correct time =
 =

zone extracted from DateTime, but there's still the problem that ICU  =

cannot use PHP's time zone objects directly, so we'd have to use the  =

identifiers. It could be possible to subclass ICU's TimeZone class to  =

create a ICU TimeZone that would wrap a DateTimeZone, but it would also =
 =

imply using the C++ API for IntlDateFormatter, which is not the case  =

currently.

-- =

Gustavo Lopes