Tim,
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.
Regards, V.P.
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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