On Aug 26, 2014, at 8:44 AM, Tony Finch <[email protected]> wrote:

> Rob Seaman <[email protected]> wrote:
>> 
>> A date is an integer.  A timestamp is a real.  (however represented)
> 
> And this is a great example of why UTC is usually implemented incorrectly.

I had a college that was graphing data that was supposed to have MJD as the X 
axis. The data was in UTC standard time stamps (including some days with 
23:59:60).  We had a long argument about how to convert the time of day to a 
fractional time of day on days with leap seconds. In the end, it turned out the 
two graphs looked identical if you did it one way vs another, so he opted for 
the most complicated to implement :).

Warner

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