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Re: How to convert Julian date into Gregorian date format in IDL? [message #89728 is a reply to message #89709]

Thu, 20 November 2014 14:14

mick.mitanirc3
Messages: 16
Registered: August 2015

Junior Member

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.

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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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