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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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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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