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Full Discussion: Format the Date output
Top Forums Shell Programming and Scripting Format the Date output Post 302435869 by methyl on Thursday 8th of July 2010 11:12:57 AM
Old 07-08-2010
There is an issue in the design of the original script where the wrong months are tested. It is most noticable for say the first of March 2010 (100301) when it would come out with yesterday as 31st March 2010 (100331) .

Working on the same idea but correcting the logic errors, I ended up with this script. Because we are working with a 2-digit year it stops working correctly after 31 December 2020 because year 2100 is not a leap year. The leading zeros issue is tackled with a "printf" statement.

Code:
#!/bin/sh
#       Display today and derive yesterday date YYMMDD. 
#       Works between 02/01/00 - 31/12/20
#
# Today
YY="`date +'%y'`"
MM="`date +'%m'`"
DD="`date +'%d'`"
TODAY="${YY}${MM}${DD}"
#
case "$MM" in
"01"|"02"|"04"|"06"|"08"|"09"|"11") # Last month was a 31 day month
        LASTDAY="31"    # Last day of last month
        ;;
"05"|"07"|"10"|"12")    # Last month was a 30 day month
        LASTDAY="30"    # Last day of last month
        ;;
"03")   # Last month was a 28/29 day month
        # Leap year adjustment
        # (does not work for year 2100 which is not a leap year)
        LEAP=`expr ${YY} % 4`
        if [ ${LEAP} -eq 0 ]
        then
                LASTDAY="29"
        else
                LASTDAY="28"
        fi
        ;;
*)
        echo "Invalid month: ${MM}"
        ;;
esac
#
if [ "${DD}" = "01" ]
then
        DD2="${LASTDAY}"        # Last day of last month
        if [ "${MM}" = "01" ]
        then
                MM2="12"
                YY2=`expr ${YY} - 1`
        else
                MM2=`expr ${MM} - 1`
                YY2="${YY}"
        fi
else
        DD2=`expr ${DD} - 1`
        MM2="${MM}"
        YY2="${YY}"
fi
#
YESTERDAY=`printf '%.2d%.2d%.2d' $YY2 $MM2 $DD2`
echo "${TODAY}"
echo "${YESTERDAY}"


Last edited by methyl; 07-09-2010 at 07:08 AM.. Reason: Correct wrong result value from original script (actually March).
 

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XCALPR(1)						      General Commands Manual							 XCALPR(1)

NAME
xcalpr - print xcal calendar entries SYNTAX
xcalpr [ -c ][ -x ][ -f file ][ -d dir ][ -u user ][ date-spec ] DESCRIPTION
Xcalpr prints the contents of the xcal files. It is intended to be used in situations when you have no access to an X screen. It can also be used to generate entries for the standard UNIX calendar program. With no arguments, it prints any entries that exist for the next seven days. The program also reads the contents of the seven daily files and prints them at the appropriate point in the output stream. Each line in the output is preceded by the day of the week, the day of the month, the month and the year. Xcalpr can be given a date specification to select months and years. If the date spec consists of just a year number, then all the data for that year is printed. For example: xcalpr 1994 will print all the data for 1994. Several years can be specified. If you give the name of a month, then the data for that month in the current year will be printed. If the month is in the past, then the data for that month next year will be printed. For example, if xcalpr oct jan is typed in August, xcalpr will print October in the current year and January next year. You can select a particular year by adding the number after any months that you need printing: xcalpr oct nov 1994 will print October and November in 1994. There are a couple of special `month' names. The name rest will print the data for the rest of the month, starting tomorrow. The rest argument is not recognised if you give a year as a parameter. If tomorrow happens to be the first day of the next month, then all the data for next month will be printed. The name next prints all the data for next month. OPTIONS
The -c option causes xcalpr to output lines suitable for input to the standard UNIX calendar program. The -d switch is followed by a directory name and specifies an alterative location for your Calendar directory. Your home directory is prepended if the name doesn't start with a slash or a dot. The -f option is followed by a file name and xcalpr will write it's output to that file, rather than standard output. The -u option is followed by a user name and dumps their calendar files rather than yours. The -x option makes xcalev operate with Calendar files that are compatible with the xcalendar program. FILES
$HOME/Calendar/* xc<dd><Mon><Year> A data file is day, Month in three letter format and the year. xy<Year> A year directory. xw<Day> A data file for the weekly code, one per day. SEE ALSO
xcal(1), xcalev(1), xcal_cal(1) AUTHOR
Copyright 1993 by Peter Collinson, Hillside Systems All rights reserved. This product includes software developed by the University of California, Berkeley and its contributors. X Version 11 R5 October 1993 XCALPR(1)
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