/usr/share/gnudatalanguage/coyote/jd2time.pro is in gdl-coyote 2016.11.13-2.
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;
; NAME:
; jd2Time
;
; PURPOSE:
; The purpose of this function is to convert a Julian day number into
; a time string of the form "16 Mar 2009".
;
;******************************************************************************************;
; ;
; Copyright (c) 2011, by Fanning Software Consulting, Inc. All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
;
;+
; The purpose of this function is to convert a Julian day number into
; a time string of the form "16 Mar 2009".
;
; :Categories:
; Utilities
;
; :Returns:
; A scalar or vector of time strings of the form "16 Mar 2009 15:34:26".
;
; :Params:
; jdnumber: in, optional, type=integer
; A Julian day number or array of Julian day numbers. If absent,
; today's current Julian day number.
; jdyear: in, optional, type=integer
; The year for which the Julian day number applies. If absent, the current year.
;
; :Keywords:
; day: out, optional, type=integer
; The day of the month as an integer.
; month: out, optional, type=integer
; The month as an integer.
; year: out, optional, type=integer
; The year as an integer.
;
; :Examples:
; Used like the IDL AXIS command::
; IDL> cgPlot, cgDemoData(1), YStyle=8, Position=[0.1, 0.1, 0.85, 0.9], /Window
; IDL> cgAxis, /YAxis, Color='red', YRange=[-500, 500], /Save, /Window
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :History:
; Change History::
; Written by: David W. Fanning, 25 June 2009.
; Added DAY, MONTH, and YEAR keywords. 18 Sept 2012. DWF.
;
; :Copyright:
; Copyright (c) 2009-2012, Fanning Software Consulting, Inc.
;-
FUNCTION JD2Time, jdnumber, jdyear, DAY=day, MONTH=month, YEAR=year
; Return to caller, on error
On_Error, 2
; Get today's date, if argument is not present.
IF N_Elements(jdnumber) EQ 0 THEN BEGIN
jnumber = Systime(/JULIAN)
CalDat, jnumber, month, day, year
RETURN, String(day, FORMAT='(I2.2)') + ' ' + $
theMonths(month, /ABBREVIATION, /FIRSTLETTER) + ' ' + $
String(year, FORMAT='(I4)')
ENDIF
; Make sure this is a Julian Day Number.
num = N_Elements(jdnumber)
error = BytArr(num)
FOR j=0,num-1 DO BEGIN
IF jdnumber[j] LT 1 OR jdnumber[j] GT 366 THEN error[j] = 1
ENDFOR
IF Total(error) NE 0 THEN Message, 'Julian Day Numbers must be in the range 1-366.'
; Make sure you have a year and that the number matches the number of days.
IF N_Elements(jdyear) EQ 0 THEN jdyear = Replicate(Fix(StrMid(Systime(), 19)), num)
IF N_Elements(jdyear) NE num THEN jdyear = Replicate(jdyear, num)
year = jdyear
; Calculate the date.
CalDat, Julday(1, jdnumber, jdyear), month, day
timeString = String(day, FORMAT='(I2.2)') + ' ' + $
theMonths(month, /ABBREVIATION, /FIRSTLETTER) + ' ' + $
String(jdyear, FORMAT='(I4)')
; Make sure you return a scalar, if needed.
IF num EQ 1 THEN Return, timeString[0] ELSE RETURN, timeString
END
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