[time-nuts] June 30 2015 leap second

d0ct0r time at patoka.org
Wed Jan 7 10:51:50 EST 2015


I was using perl as a tool to calculate UNIX time. As my project based 
on STM32 MCU, I have no option to use time libraries. And I dont' think 
its applcable for my project. I am thinking what exactly of that UNIX 
time is. Looks like its using simple constants, like we have 86400 
seconds per day, we have 365/366 days per year. And we have certain 
"leap years" with strict rule to identify it. For the clock to use on a 
desk, its should be sufficient to avoid confusion with rest of the 
world. ;-) In the other words, looking to current UNIX time we could 
identify the current date/time as most people see it. But its give us 
zero info about actual number of seconds passed since Thursday, 1 
January 1970, 00:00:00.


> V.P., since you mention Perl and leap seconds, I'd like to point out
> that there's a very useful Perl library for computing delta times
> around leapsecond jumps:
> http://search.cpan.org/~drolsky/DateTime-1.12/lib/DateTime/LeapSecond.pm
> [6]
> This particular library is useful if you need to know the correct
> delta time between UTC timestamps but have chosen to ignore the
> ambiguity problem of correctly marking the leapsecond itself.

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