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Re: How to convert Julian date into Gregorian date format in IDL? [message #89729 is a reply to message #89728]

Thu, 20 November 2014 14:51

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 11/20/14, 3:14 PM, mick.mitanirc3@gmail.com wrote:
> I think the disconnect here is between Julian Date and Julian Day of
> Year (DOY).
>
> Mr. Hasan's value of 213 is a Julian Day of Year value, in this case
> 213 days into year 2010. Systime with the /Julian flag returns the
> Julian Date value - the number of seconds elapsed since 00:00:00 Jan
> 1 1970 UTC (commonly called the Unix or POSIX Epoch).
>
> The military often use Julian DOY in the form of YYYYDOY or YYDOY and
> unfortunately usually call the result a Julian Date which wasn't a
> problem until us programmers came around with our date/time
> functions.
>
> The JHU library function I mentioned in my first reply works with
> Julian DOY.
>

Ah, got it! I have not heard DOY called a Julian date.

--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
Research Mathematician
Tech-X Corporation

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[Message index]

		How to convert Julian date into Gregorian date format in IDL? By: Muhammad Hasan on Wed, 19 November 2014 05:34
		Re: How to convert Julian date into Gregorian date format in IDL? By: Michael Galloy on Wed, 19 November 2014 06:22
		Re: How to convert Julian date into Gregorian date format in IDL? By: Muhammad Hasan on Thu, 20 November 2014 01:28
		Re: How to convert Julian date into Gregorian date format in IDL? By: Michael Galloy on Thu, 20 November 2014 10:21
		Re: How to convert Julian date into Gregorian date format in IDL? By: mick.mitanirc3 on Wed, 19 November 2014 09:13
		Re: How to convert Julian date into Gregorian date format in IDL? By: David Fanning on Wed, 19 November 2014 09:33
		Re: How to convert Julian date into Gregorian date format in IDL? By: Muhammad Hasan on Thu, 20 November 2014 01:29
		Re: How to convert Julian date into Gregorian date format in IDL? By: Muhammad Hasan on Thu, 20 November 2014 01:31
		Re: How to convert Julian date into Gregorian date format in IDL? By: mick.mitanirc3 on Wed, 19 November 2014 10:00
		Re: How to convert Julian date into Gregorian date format in IDL? By: David Fanning on Wed, 19 November 2014 10:23
		Re: How to convert Julian date into Gregorian date format in IDL? By: mick.mitanirc3 on Thu, 20 November 2014 14:14
		Re: How to convert Julian date into Gregorian date format in IDL? By: Michael Galloy on Thu, 20 November 2014 14:51
		Re: How to convert Julian date into Gregorian date format in IDL? By: David Fanning on Thu, 20 November 2014 14:59

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