Hello,
As I am in the process of creation of my own Nixie clocks. And it
probably good time frame to clarify one thing about leap seconds. In my
project I am using GPS module as an option to have current UTC time and
also to have 1PPS signal to do auto-adjustment for external RTC module.
The question is how usually GPS modules handle leap seconds ? Is it
satelates who send UTC time to GPS module or GPS module has firmware
with leap second information hard-coded ?
The same question is for UNIX epoch time. How computers knows if it is
necessary to add leap seconds ? Lets say I am using very simple script
to calculate UNIX time for specified date:
========================================================
#!/usr/bin/perl
use Time::Local;
my ($d, $m, $y);
my $time;
@myYears = ('01/06/2000', '01/06/2015', '01/06/2038', '01/06/3000');
foreach (@myYears) {
($d, $m, $y) = split '/', $_;
$time = timelocal(0,0,0,$d,$m-1,$y);
printf "%ld\n\r", $time;
}
======================================================
It will produce the following output:
959832000
1433131200
2158977600
32516740800
I am not sure if its take leap second consideration. Most likely not.
And that means its only accurate for the present and pas time. Right ?
For my clock I already implement the function for the leap second and I
am able to add/remove number of seconds from the time I receiving from
GPS or any other source. But it will be more inetersting if clock could
do it "automagically" and shows me that famous "60" number without human
interaction. Any advise for this ? Thanks !
Regards,
V.P.
On , Tom Van Baak wrote:
Just announced: there will be a positive leap second at the end of
June 30 2015 UTC (that's Wednesday July 1st for most of the world).
As usual we time nuts will have a leap second party -- where we
capture and share the magic hh:59:60 display on as many different
clocks and instruments as possible.
/tvb
More info:
ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat
http://hpiers.obspm.fr/eop-pc/
And for those of you who want to know how long each day really is:
ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.dat
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--
WBW,
V.P.
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