NAME: date2jul
PURPOSE: gives julian day equivalent of a date in yyyymmdd format
CATEGORY: calendar
CALLING SEQUENCE: jday = juldate(19930124)
INPUTS: date in yyyymmdd format
KEYWORD PARAMETERS:
/GRADS: if 1 <= year <= 49 --> year = 2000 + year
if 50 <= year <= 99 --> year = 1900 + year
OUTPUTS:date en jour julien
COMMON BLOCKS: none
SIDE EFFECTS: ?
RESTRICTIONS: ?
EXAMPLE:
IDL> print, date2jul(19931205) EQ julday(12,5,1993)
1
IDL> print, date2jul(931205,/grads) EQ julday(12,5,1993)
1