Re: [Ccrtp-devel] Wrong value in NTP_EPOCH_OFFSET - duplicate

[Martin Runge]

Sorry for posting twice. Wrong sender address was not accepted by the list 
first.

regards
Martin


> -----Ursprüngliche Nachricht-----
> Von: "Martin Runge" <address@hidden>
> Gesendet: 07.01.08 10:36:16
> An: address@hidden
> Betreff: [Ccrtp-devel] Wrong value in NTP_EPOCH_OFFSET


> 
> Hi everybody on the list,
> 
> I think the NTP_EPOCH_OFFSET in private.h has 3600 seconds too much. 3600 s 
> == 
> 1 hour, so it looks like a timezone problem, but it isn't.
> 
> I verified it in two ways:
> 
> 1)
> from the leap seconds file from http://www.cis.udel.edu/~mills/leap.html 
> 2272060800    10      # 1 Jan 1972
> says Jan, 1st 1972 had 2272060800 seconds passed since 1.1.1900 00:00:00h
> 
> 1972 was a leap year, so 1970 and 1971 both had 365 days and therefore
> 
> 2* 365 * 24 *3600 seconds = 6307200 seconds
> 
> 2208992400 + 6307200 = 2272064400
> that is 3600 s (==1 hour) more than in the leap seconds file.
> 
> 2)
> boost_date_time:
> long h = now.tv_sec / 3600;
> long s = now.tv_sec % 3600;
> long m = s / 60;
> s = s % 60;
> unsigned us = now.tv_usec;
>     
> boost::posix_time::time_duration td(hours(h) 
>                                                              + minutes(m) 
>                                                              + seconds(s) 
>                                                              + microsec(us));
>   
> boost::posix_time::ptime boost_time;
> boost_time = ptime(boost::gregorian::date(1970, Jan, 1), td); 
> 
> cerr << "Boost Time: " << boost_time << endl;
> 
> => shows exactly the result I would expect from the NTP offset in the leap 
> seconds file.
> 
> best regards
> Martin
> 
> 
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> 


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