;+
;
; @file_comments
; gives yyyymmdd date equivalent of a Julian day
;
; @categories
; Calendar
;
; @param jday {in}{required} {type=double}
; Julian day
;
; @returns
; date in yyyymmdd format
;
; @examples
;
; IDL> print, jul2date(julday(12,23,1999))
;        19991223
;
; @history
; Sebastien Masson (smasson\@lodyc.jussieu.fr)
;                       June 2005
;
; @version
; $Id$
;
;-
;
function jul2date, jday
;
  compile_opt idl2, strictarrsubs
;
  caldat, jday, month, day, year, hour, min, sec
;
  res = (10000L*year + 100L*month + day)*(year GE 0) $
        +( 10000L*year - 100L*month - day)*(year LT 0)
;
  IF total([hour NE 12, min NE 0, abs(sec) GE 1.e-4]) EQ 0 THEN return, long(res) $
  ELSE return, double(res) + (hour / 24.0d0) + (min/1440.0d0) + (sec / 86400.0d0)

end