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[Ccrtp-devel] Wrong value in NTP_EPOCH_OFFSET
From: |
Martin Runge |
Subject: |
[Ccrtp-devel] Wrong value in NTP_EPOCH_OFFSET |
Date: |
Sun, 6 Jan 2008 15:41:08 +0100 |
User-agent: |
KMail/1.9.6 (enterprise 0.20070907.709405) |
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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