Groups > comp.os.linux.development.apps > #410

Re: time conversion

From	Jasen Betts <jasen@xnet.co.nz>
Newsgroups	comp.os.linux.development.apps
Subject	Re: time conversion
Date	2012-01-28 21:15 +0000
Organization	Dis (not Dat) Organisation
Message-ID	<jg1ohu$m4e$1@reversiblemaps.ath.cx> (permalink)
References	<jfsjn2$4hm$1@dont-email.me>

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On 2012-01-26, Bill M <wpmccormick@just_about_everywhere.com> wrote:
> What is the easiest way to convert a time value that is the number
> of microseconds that have elapsed since 0000 hours 1 January 1972 into 
> the unixepoch (the number of seconds since 0000 hours 1 January 1970).
>
> Is there some time function for this already? Or do I need to use struct tm?

no, and no.

divide by 1000000    
  which converts microseconds into seconds 
and then add (2x365x25x60x60) 
  which is the missing tw yars worth of seconds

I am assuming both schemes agree about leap seconds.


hmm, 1972 eh?

You may find enlightenment in the source of ntpdate, but be aware that the
NTP epoch differs by 10 seconds from the one you describe.

-- 
⚂⚃ 100% natural

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time conversion Bill M <wpmccormick@just_about_everywhere.com> - 2012-01-26 16:22 -0600
  Re: time conversion Richard Kettlewell <rjk@greenend.org.uk> - 2012-01-26 23:01 +0000
    Re: time conversion Richard Kettlewell <rjk@greenend.org.uk> - 2012-01-27 09:18 +0000
    Re: time conversion Josef Moellers <josef.moellers@ts.fujitsu.com> - 2012-01-27 14:20 +0100
      Re: time conversion Richard Kettlewell <rjk@greenend.org.uk> - 2012-01-27 13:50 +0000
        Re: time conversion Bill M <wpmccormick@just_about_everywhere.com> - 2012-01-27 08:19 -0600
  Re: time conversion Jasen Betts <jasen@xnet.co.nz> - 2012-01-28 21:15 +0000
    Re: time conversion Bill M <wpmccormick@just_about_everywhere.com> - 2012-01-31 14:34 -0600

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