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Double precision data into caldat [message #91879]

Tue, 08 September 2015 12:37

laura.hike
Messages: 87
Registered: September 2013

Member

Hi,

I'm trying to convert some Julian dates back into standard dates using caldat. (In fact, I am testing what I got out of julday in the first place.) There should be hours and minutes in the results. If I take the output of julday as a variable, say TEST, and put it into caldat as

caldat, test, m, d, y, h, mm, s

I get the right answer. However, if I just use the actual value of test, I get odd results. So, for the Julian day 2456658.56250000, I should get

2014 1 1 1 30 0

in year, month, day, hour, min, sec form. If I use

caldat, 2456658.56250000D, m, d, y, h, mm, s

the results are correct, but if I do the type conversion using double(), it doesn't. So I have

caldat, double(2456658.56250000), m, d, y, h, mm, s

and

p = double(2456658.56250000)
caldat, p, m, d, y, h, mm, s

both giving the result

2014 1 1 0 0 0

Does anyone know why this is? As far as I know, all of those input values are the same.

Thanks!

PS Why on earth does IDL use month, day, year rather than year, month, day in both caldat and julday??

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[Message index]

		Double precision data into caldat By: laura.hike on Tue, 08 September 2015 12:37
		Re: Double precision data into caldat By: David Fanning on Tue, 08 September 2015 13:01
		Re: Double precision data into caldat By: laura.hike on Tue, 08 September 2015 13:38
		Re: Double precision data into caldat By: laura.hike on Tue, 08 September 2015 13:43
		Re: Double precision data into caldat By: Jim Pendleton on Tue, 08 September 2015 14:18
		Re: Double precision data into caldat By: Lajos Foldy on Tue, 08 September 2015 13:54
		Re: Double precision data into caldat By: Paul Van Delst[1] on Tue, 08 September 2015 13:58
		Re: Double precision data into caldat By: laura.hike on Tue, 08 September 2015 15:22
		Re: Double precision data into caldat By: David Fanning on Tue, 08 September 2015 15:43

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