From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail
From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Time_Zone-aware Day_of_Week ?
Date: Mon, 13 Jul 2015 09:45:44 -0700
Organization: Also freenews.netfront.net; news.tornevall.net;
 news.eternal-september.org
Message-ID: <mo0pt1$c8n$1@dont-email.me>
References: <slrnmq7f6j.1ga.lithiumcat@nat.rebma.instinctive.eu>
Mime-Version: 1.0
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Injection-Date: Mon, 13 Jul 2015 16:44:19 +0000 (UTC)
Injection-Info: mx02.eternal-september.org;
 posting-host="a3855fbfe1a666be9aefba0563039ed5";
	logging-data="12567"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1/BCZSqzf2ts3Mx4EXCjOwJAedMTifk74c="
User-Agent: Mozilla/5.0 (X11; Linux x86_64;
 rv:31.0) Gecko/20100101 Thunderbird/31.7.0
In-Reply-To: <slrnmq7f6j.1ga.lithiumcat@nat.rebma.instinctive.eu>
Cancel-Lock: sha1:Uky3aNTwwkkZcj6K9T/nhvW39M8=
Xref: news.eternal-september.org comp.lang.ada:26805
Date: 2015-07-13T09:45:44-07:00
List-Id: <comp.lang.ada>

On 07/13/2015 06:26 AM, Natasha Kerensikova wrote:
> 
> Moreover, the description in the ARM of the function is quite terse:
> "Returns the day of the week for Time. This is based on the Year, Month,
> and Day values of Time."

Presumably the Year, Month, and Day returned by Ada.Calendar.Split.

> However, all of Year, Month and Day functions do have the Time_Zone
> argument that Day_of_Week lacks. So which time offset is Day_of_Week
> supposed to use?

I'd guess the time offset given by Ada.Calendar.Time_Zones.UTC_Time_Offset.

PragmARC.Date_Handler.Day_Of_Week gives you the day of week of any Year, Month,
and Day CE you care to give it, even for values of Year outside
Ada.Calendar.Year_Number. It can also give you the day of week for any
Ada.Calendar.Time, using the Year, Month, and Day returned by Ada.Calendar.Split.

The PragmAda Reusable Components are at

https://pragmada.x10hosting.com/pragmarc.htm

-- 
Jeff Carter
"He that hath no beard is less than a man."
Much Ado About Nothing
132