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Re: julday() and fractional days [message #56450 is a reply to message #56448]

Wed, 31 October 2007 08:49

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Ed Hyer <ejhyer@gmail.com> writes:
> OK, if you search c.l.i-p for this you'll find a post from Craig
> Markwardt wherein he laments that JULDAY "doesn't handle fractional
> days". Someone replies to say yes it does, but I think that person
> misunderstood.
>
> IDL> print,julday(12,31,2005,0,0,0)
> 2453735.5
> IDL> print,julday(12,31.2,2005,0,0,0)
> 2453735.5
>
> I'm really unhappy with IDL right now.

I mostly use my own simple Julian day routine just to avoid all these
annoying surprises.

But in your case it would *almost* be easy enough to work around it
with something like,

IDL> print,julday(12,31,2005,0,0,0) + .2
2453735.7

or programmatically,

IDL> print,julday(month,floor(day),year,0,0,0) + (day-floor(day))

But the annoyance is in taking the time to discover these quirks, and
to remember them.

Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: julday() and fractional days By: Bob[3] on Wed, 31 October 2007 09:16
		Re: julday() and fractional days By: Craig Markwardt on Wed, 31 October 2007 08:49
		Re: julday() and fractional days By: ben.bighair on Tue, 30 October 2007 19:20
		Re: julday() and fractional days By: Craig Markwardt on Thu, 01 November 2007 07:39

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