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=0.4 required=5.0 tests=BAYES_00,FORGED_MUA_MOZILLA
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: a07f3367d7,59c3b3f9911c9191
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII-7-bit
Received: by 10.224.177.12 with SMTP id bg12mr1437597qab.0.1343315510006;
        Thu, 26 Jul 2012 08:11:50 -0700 (PDT)
Received: by 10.66.72.165 with SMTP id e5mr1630417pav.4.1343315412089;
        Thu, 26 Jul 2012 08:10:12 -0700 (PDT)
Path: 
 a15ni113198934qag.0!nntp.google.com!q21no4160706qas.0!news-out.google.com!p10ni64989877pbh.1!nntp.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!nx02.iad01.newshosting.com!newshosting.com!newspump.sol.net!94.232.116.11.MISMATCH!feed.xsnews.nl!border-1.ams.xsnews.nl!newsfeed.straub-nv.de!news.swapon.de!news.mixmin.net!eweka.nl!hq-usenetpeers.eweka.nl!newsfeed101.telia.com!starscream.dk.telia.net!bumblebee.dk.telia.net!not-for-mail
Date: Tue, 24 Jul 2012 16:10:45 +0200
From: erlo <erlo@none>
User-Agent: Mozilla/5.0 (X11; Linux i686;
 rv:14.0) Gecko/20120714 Thunderbird/14.0
MIME-Version: 1.0
Newsgroups: comp.lang.ada
Subject: Re: Ada.Calendar and NTP (and Unix Epoch)
References: <500dc548$0$2936$f40e02c5@shockwave.dk.telia.net>
 <18893cca-baa2-4930-bfb4-4c4f7eb7e983@googlegroups.com>
 <5s8s08lv6dj1i4tkb99roq9roifsgr44vd@invalid.netcom.com>
 <1e0fmpgo1d8ke.7gc1rzrv8v72.dlg@40tude.net>
 <6f28df4c-6b1a-46d1-a3b9-9ae41ea975a2@googlegroups.com>
 <4l5t6lhzgquo$.qa4ud3ssphtd.dlg@40tude.net>
 <4b3daad0-b884-4f42-9aa5-891bcfeadf87@googlegroups.com>
 <i40m7m2dvxtu.pxub1yo0ucwt$.dlg@40tude.net>
 <221dd619-09dd-4d62-9a42-f967471c3d12@googlegroups.com>
 <l8pycer87ac4.zzwxbrzox0xs.dlg@40tude.net>
In-Reply-To: <l8pycer87ac4.zzwxbrzox0xs.dlg@40tude.net>
Message-ID: <500eace5$0$2933$f40e02c5@soundwave.dk.telia.net>
NNTP-Posting-Host: 62.198.148.244
X-Trace: 1343139045 soundwave.dk.telia.net 2933 62.198.148.244:51643
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Date: 2012-07-24T16:10:45+02:00
List-Id: <comp.lang.ada>

On 07/24/2012 03:02 PM, Dmitry A. Kazakov wrote:
>
> Is it a standard Ada package?
I guess it's a gnat-specific package - I can't find it in the RM.
>
>> into thinking that I can use To_Ada_Time to convert the NTP epoch base
>> (1-1-1900 0:00) to a variable of type Time.
>
> Take some other base, e.g. 01.01.2010 00:00 [UTC, GMT, CET ...], if you
> have an NTP reading of it. E.g. if NTP uses some astronomical year or other
> method to calculate difference between two times.
>
I will try this approach.
> You should not use Ada.Calendar without knowing exactly what time it
> represents on the given machine.
>
>>> This presumes that they represent *same* time though maybe using different
>>> epochs. You might need to read the UNIX and NTP documentation to learn what
>>> exactly times they do represent. That would give you E2 - E1. To put it
>>> simple: same time = synchronized clocks.
>>
>> This is the exact case.
>
> Which I doubt, but anyway.
>
>
--
Regards
Erlo