On Aug 18, 2011, at 6:23 PM, "John Caron" <ca...@unidata.ucar.edu> wrote:

>> In order to do calculations
>> with times, which are often necessary, we need to be able to convert them 
>> into
>> a form which has a fixed-length unit since a reference time (like udunits),
>> even though that isn't the most convenient way to express them.
> I think that given two calendar dates in the same calendar, there will 
> be a well-defined # seconds between them. 

Yes...and no. There is the question of leap seconds. In the satellite data 
world, most people account for them, but not everyone. Some (most?) off the 
shelf packages do not. 
--
Chris Lynnes
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