Julian Date Post: 35562

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Top Forums Shell Programming and Scripting Julian Date Post 35562 by oombera on Thursday 17th of April 2003 02:41:38 PM

04-17-2003

Registered User

Well if you can alter the script that's passing the parameter, you could change the piece of code, such as date +%Y%j, so that it sends what you want it to send, such as date +%Y%m%d.

Otherwise...
Assuming the variable that stores that passed value is called varPassed, you can put this (ksh) code in a file called someScript, make it executable, and call it with newValue=`someScript $varPassed`:

Code:

varPassed=$1

month=1
flag=0

theYear=`echo $varPassed | awk '{print substr ($0, 1, 4)'}`
dayOfYear=`echo $varPassed | awk '{print substr ($0, 5, 3)'}`
dayOfYear=`expr $dayOfYear - 0`

TestLeapYear() {
  if [[ `expr $theYear % 4` != 0 && $dayOfYear -gt 28 ]] then
    month=`expr $month + 1`
    dayOfYear=`expr $dayOfYear - 28`
  else
    if [[ `expr $theYear % 4` = 0 && $dayOfYear -gt 29 ]] then
      month=`expr $month + 1`
      dayOfYear=`expr $dayOfYear - 29`
    else
      flag=1
    fi
  fi
}

Days30() {
  if [[ $dayOfYear -gt 30 ]] then
    month=`expr $month + 1`
    dayOfYear=`expr $dayOfYear - 30`
  else
    flag=1
  fi
}

Days31() {
  if [[ $dayOfYear -gt 31 ]] then
    month=`expr $month + 1`
    dayOfYear=`expr $dayOfYear - 31`
  else
    flag=1
  fi
}

Days31 #january
if [[ $flag = 0 ]] then
  TestLeapYear #february
fi
if [[ $flag = 0 ]] then
  Days31 #march
fi
if [[ $flag = 0 ]] then
  Days30 #april
fi
if [[ $flag = 0 ]] then
  Days31 #may
fi
if [[ $flag = 0 ]] then
  Days30 #june
fi
if [[ $flag = 0 ]] then
  Days31 #july
fi
if [[ $flag = 0 ]] then
  Days31 #august
fi
if [[ $flag = 0 ]] then
  Days30 #september
fi
if [[ $flag = 0 ]] then
  Days31 #october
fi
if [[ $flag = 0 ]] then
  Days30 #november
fi

if [[ $month -lt 10 ]] then
  month=0$month
fi
if [[ $dayOfYear -lt 10 ]] then
  dayOfYear=0$dayOfYear
fi

echo $theYear$month$dayOfYear

Last edited by oombera; 04-17-2003 at 03:52 PM..

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LEARN ABOUT OPENDARWIN

getdate

GETDATE(1)                                                         User Commands                                                        GETDATE(1)

NAME

       getdate - AME

SYNOPSIS

       [-dv][-n dec][-f format] [ra dec sys] itype2otype [date and/or time]

DESCRIPTION

       Convert date and time between various formats

              [-dv][-n dec][-f format] itype2otype @file

              itype: nfd=ISOFITS fd=FITS, dt=yyyy.mmdd, hr=hh:mm:ss, deg=dd:mm:ss

              jd=Julian  Date,  mjd=Modified Julian Date hjd=Heliocentric Julian Date, mhjd=Modified HJD ep=epoch, epj=Julian epoch, epb=Besselian
              epoch lt=local time, ut=UT, ts=seconds since 1950-01-01 now=current time, ang=fractional degrees

              otype: fd=FITS, dt=yyyy.mmdd, jd=Julian Date, mjd=Modified Julian Date

              hjd=Heliocentric Julian Date, mhjd=Modified HJD  hr=hh:mm:ss,  deg=dd:mm:ss,  ang=fractional  degrees  ep=epoch,  epj=Julian  epoch,
              epb=Besselian epoch ts=seconds since 1950-01-01, tsu=Unix sec, tsi=IRAF sec gst=Greenwich Sidereal Time, lst=Local Sidereal Time

              @file: First one or two columns are in itype format ra dec sys:  Need for Heliocentric conversions

       -a: Append date to input file, if there is one

       -d: Print date without time

       -e: Print output as ET/TDT/TT converting from UT

       -f: Format for output number (C printf)

       -h hours: Longitude in hours, west positive

       -l degrees: Longitude in degrees, west positive

       -n: Number of decimal places in sec, epoch, JD

       -t: Print time without date

       -v: Verbose

getdate 3.8.4                                                        June 2012                                                          GETDATE(1)