[erlang-questions] Working with dates.

Michael McDaniel <>
Mon Jul 16 04:07:34 CEST 2007


On Sun, Jul 15, 2007 at 06:44:50PM -0700, Michael McDaniel wrote:
> On Sun, Jul 15, 2007 at 06:40:45PM -0700, Michael McDaniel wrote:
> > 
> > On Sun, Jul 15, 2007 at 06:39:18PM -0500, Julio César Carrascal Urquijo (MCTS) wrote:
> > > Hi,
> > > 
> > > Two quick questions on functionality that I couldn't find on the documentation:
> > > 
> > > 1) Are there functions in OTP to convert unix timestamp <--> the tuple
> > > format used in Erlang?
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > 
> >  ()174> Seconds = os:cmd("../c/time").
> >  "1184549721"
> >  ()175> {Days, Time} = calendar:seconds_to_daystime( list_to_integer(Seconds) ).
> >  {13710,{1,35,21}}
> >  ()176> Date = calendar:gregorian_days_to_date( Days ).
> >  {37,7,15}
> ^^^^^^^^^^^^^^
> ^^^^^^^^^^^^^^
>   oops, 37 ? something's not right, obviously...
> ~M
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  Ok, because Unix time starts @1970 and Gregorian starts, apparently, at 0.
  Adding 1970+37 = 2007 but I wonder if there would be an "off by 1" somewhere
  down the road...
~M


> 
> >  ()177> calendar:datetime_to_gregorian_seconds( {Date, Time} ).
> >  1184549721
> >  ()178> 
> > 
> > ~Michael
> > 
> > > 2) Are there functions for adding dates in this format?
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > 
> >   could add seconds and convert...
> > 
> > ~Michael
> > 
> > > 
> > > Thanks
> > > 
> > > -- 
> > > Julio César Carrascal Urquijo
> > > Microsoft Certified Technology Specialist
> > > http://jcesar.3stecnoinformatica.com/
> > > _______________________________________________
> > > erlang-questions mailing list
> > > 
> > > http://www.erlang.org/mailman/listinfo/erlang-questions
> > > 
> > > 
> > > 
> > > 
> > 
> > -- 
> > Michael McDaniel
> > Portland, Oregon, USA
> > http://autosys.us
> > +1 503 283 5284
> > _______________________________________________
> > erlang-questions mailing list
> > 
> > http://www.erlang.org/mailman/listinfo/erlang-questions
> > 
> > 
> > 
> > 
> 
> -- 
> Michael McDaniel
> Portland, Oregon, USA
> http://autosys.us
> +1 503 283 5284
> _______________________________________________
> erlang-questions mailing list
> 
> http://www.erlang.org/mailman/listinfo/erlang-questions
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> 

-- 
Michael McDaniel
Portland, Oregon, USA
http://autosys.us
+1 503 283 5284



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