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Get the previous month from date

 
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# 1  
Old 12-02-2012
Get the previous month from date
Hi All,
I am using the below code to get the year and month from date:
Below gives output like 201212.
Code:
dt=`date '+%Y%m'`

how do i get the previous month value(ie: subtract 1 from date)
example output:
Code:
dt=201211

Please help. Smilie
Last edited by Scott; 12-02-2012 at 11:13 AM.. Reason: Code tags
# 2  
Old 12-02-2012
Code:
date -d'-1 month' '+%Y%m'
201211

Code:
uname
Linux
echo $SHELL
/bin/bash

# 3  
Old 12-02-2012
Quote:
Originally Posted by abhi_123
how do i get the previous month value(ie: subtract 1 from date)
Search on "datecalc" in this forum.
# 4  
Old 12-02-2012
If you are on a system where date doesn't have a -d option, the following will work in any POSIX conforming shell:
Code:
#!/bin/ksh
dt=$(date +%Y%m)
dt=$((dt - 1))
if [ ${dt#????} -eq 0 ]
then    dt=$((${dt%??} - 1))12
fi
printf "dt has been set to %s\n" $dt

until we cross the y10K date boundary.
 
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