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Top Forums Shell Programming and Scripting Calculating 7 days ago date for the given Argument Post 302535783 by Corona688 on Friday 1st of July 2011 03:52:34 PM
Old 07-01-2011
[edit] You stealth-edited my stealth edit, Jim Smilie
[edit] whoops, %Y%m%d not %Y%m%s!

Code:
# Get epoch seconds
USERDATE=$(date +%s -d 20110701)
# Subtract 1 week
((USERDATE -= (60*60*24*7) ))

# Convert from epoch seconds into YYYYMMDD.
# -d assumes strings beginning with @ are epoch seconds.
D=$(date -d "@$USERDATE" +"%Y%m%d")
echo "One week previous was $D"


Last edited by Corona688; 07-01-2011 at 05:02 PM..
 

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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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