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Top Forums Shell Programming and Scripting Calculate Julian date of a given date Post 302996948 by vgersh99 on Thursday 4th of May 2017 01:45:15 PM
Old 05-04-2017
Not sure what you mean by "Julian date (three digit)", but here's something that could be helpful - greg2jul.sh.
greg2jul.sh 2017 05 04
Code:
#!/bin/ksh

echo "$1 $2 $3" | awk '
function date2julian(year, month, day,  _m, _y)
{
  _m=12 * year + month - 3
  _y= _m / 12
  return ( int( (734 * _m + 15) / 24 -  2 * _y + _y/4 - _y/100 + _y/400 + day + 1721119) )

}
{
  print date2julian($1,$2,$3)
}'

 

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CAL_FROM_JD(3)								 1							    CAL_FROM_JD(3)

cal_from_jd - Converts from Julian Day Count to a supported calendar

SYNOPSIS
array cal_from_jd (int $jd, int $calendar) DESCRIPTION
cal_from_jd(3) converts the Julian day given in $jd into a date of the specified $calendar. Supported $calendar values are CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH and CAL_FRENCH. PARAMETERS
o $jd - Julian day as integer o $calendar - Calendar to convert to RETURN VALUES
Returns an array containing calendar information like month, day, year, day of week, abbreviated and full names of weekday and month and the date in string form "month/day/year". EXAMPLES
Example #1 cal_from_jd(3) example <?php $today = unixtojd(mktime(0, 0, 0, 8, 16, 2003)); print_r(cal_from_jd($today, CAL_GREGORIAN)); ?> The above example will output: Array ( [date] => 8/16/2003 [month] => 8 [day] => 16 [year] => 2003 [dow] => 6 [abbrevdayname] => Sat [dayname] => Saturday [abbrevmonth] => Aug [monthname] => August ) SEE ALSO
cal_to_jd(3), jdtofrench(3), jdtogregorian(3), jdtojewish(3), jdtojulian(3), jdtounix(3). PHP Documentation Group CAL_FROM_JD(3)
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