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Top Forums Shell Programming and Scripting Easiest way 2 convert the time YYYY-MM-DD HH:MM:SS.subsec to MJD - gAWK? Post 302436579 by menon on Monday 12th of July 2010 10:34:44 PM
Old 07-12-2010
Thank you

I will try it and post the results here, to be useful for other people.

---------- Post updated at 23:34 ---------- Previous update was at 12:47 ----------

why the results are different?
{
typeset year=$1; typeset month=$2; typeset day=$3
typeset tmpmonth=$((12 * year + month - 3))
typeset tmpyear=$((tmpmonth / 12))
JD=$(( (734 * tmpmonth + 15) / 24 - 2 * tmpyear + \
tmpyear/4 - tmpyear/100 + tmpyear/400 + day + 1721119 ))
MJD=$((JD - 2400001)) #0.5 truncated
echo $MJD
}
echo $(date2julian 1987 5 31)

is different from:
gawk '{tmpmonth=((12*$1)+$2-3);tmpyear=(tmpmonth/12)}\
{ print (((tmpmonth*734)+15)/24-(2*tmpyear)+(tmpyear/4)-(tmpyear/100)+(tmpyear/400)+$3 +1721119-2400001)}' temp6.txt


temp6 > 1987 05 31 12 29 13
 

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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)
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