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Full Discussion: Date operations in Unix?
Top Forums Shell Programming and Scripting Date operations in Unix? Post 302374913 by smr_rashmy on Wednesday 25th of November 2009 10:36:08 PM
Old 11-25-2009
Quote:
Originally Posted by jsmithstl
Try this: In my example below, it is assuming B is always greater than A. This could be coded to where it doesn't matter as well.

Code:
#!/bin/ksh

DATE_A=$(date +%Y%m%d%H%M%S -d "$1")
DATE_B=$(date +%Y%m%d%H%M%S -d "$2")

DATE_C=$(date +%Y%m%d%H%M%S)

if [ "${DATE_C}" -gt "${DATE_B}" ]; then
   echo "C, ${DATE_C},  is greater than B, ${DATE_B}"
elif [ "${DATE_C}" -gt "${DATE_A}" ]; then
   echo "DATE_C, ${DATE_C},  is between A, ${DATE_A}, and B, ${DATE_B}"
else
   echo "C, ${DATE_C},  is less than A, ${DATE_A}"
fi


tests
Code:
$./chk_date.ksh "01-JAN-2009 10:20:10" "12-DEC-2009 10:30:00"
C, 20091125051733,  is between A, 20090101102010, and B, 20091212103000

$ ./chk_date.ksh "01-DEC-2009 10:20:10" "12-DEC-2009 10:30:00"
C, 20091125051752,  is less than A, 20091201102010

$ ./chk_date.ksh "01-JAN-2009 10:20:10" "01-JAN-2009 10:30:00"
C, 20091125051824,  is greater than B, 20090101103000

This is working fine..
Thank you friend!

For date B, I need to add some mins with current date. How could i get it?



---------- Post updated at 10:36 PM ---------- Previous update was at 10:34 PM ----------

Quote:
Originally Posted by jim mcnamara
TRy Perderabo's datecalc script:
https://www.unix.com/answers-frequent...rithmetic.html

Convert A to epoch seconds (%s), then B to epoch seconds (%s), C to epoch seconds.
You now have three numbers to compare to answer your questions.
I have seen epoch seconds method in net, It is using perl command.
I do not have perl in my system. Thanks for your quick response friend Smilie
 

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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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