Calendar/
date2jul.pro
gives Julian day equivalent of a date given in yyyymmdd format
This is the inverse of the function jul2date.
date2jul
Calendar
result = date2jul(date, GRADS=GRADS, MONTH=MONTH, DAY=DAY, YEAR=YEAR, HOUR=HOUR, MINUTE=MINUTE, SECOND=SECOND)
Return value
Julian day with the same format (long or double) as the input parameter
Parameters
date
in
required
type: long or double, scalar or array
longword integer with yyyymmdd format or double-precision
floating-point with yyyymmdd.xx where xx is the fraction of the day
(xx=0 at 0am and 5 at 12am)
Keywords
GRADS
if 1 <= year <= 49 --> year = 2000 + year
if 50 <= year <= 99 --> year = 1900 + year
MONTH
Set this keyword equal to a named variable that will receive a
longword integer or longword integer array representing the number of
the desired month (1 = January, ..., 12 = December).
DAY
Set this keyword equal to a named variable that will receive a
longword integer or longword integer array representing the number of
the day of the month (1-31).
YEAR
Set this keyword equal to a named variable that will receive a
longword integer or longword integer array representing the number of
the desired year (e.g., 1994).
HOUR
Set this keyword equal to a named variable that will receive a
longword integer or longword integer array representing the number of
the hour of the day (0-23).
MINUTE
Set this keyword equal to a named variable that will receive a
longword integer or longword integer array representing the number of
the minute of the hour (0-59).
SECOND
Set this keyword equal to a named variable that will receive a
double-precision floating-point value or a double-precision
floating-point array representing the number of the second of the
minute (0-59).
Examples
IDL> jday = juldate(19930124)
IDL> print, date2jul(19931205) EQ julday(12,5,1993)
1
IDL> print, date2jul(931205,/grads) EQ julday(12,5,1993)
1
IDL> print, date2jul(19931205.5d) EQ julday(12,5,1993,12,0,0)
1
IDL> print, date2jul(19931205.0d) EQ julday(12,5,1993,0,0,0)
1
Version history
Version
$Id: date2jul.pro 329 2007-12-20 17:12:44Z smasson $
History
Sebastien Masson (smasson@lodyc.jussieu.fr) June 2005
Known issues
Restrictions
Input param must be longword integer or double-precision floating-point
Produced by IDLdoc 2.0.
