Date command is not working properly

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# 1  
Old 03-30-2014
Date command is not working properly


in my script, i take the last month by
a=$(date --date '1 month ago' +%Y%m)

i expect that it give me in this month "March" as result 201402,
but linux gave me 201403.
IMPe@ABC123:> ~/date --date '1 month ago' +%Y%m

i'm reasonably confused. Any idea?

Thanks in advance,

Linux ABC123 3.11.10-7-desktop #1 SMP PREEMPT Mon Feb 3 09:41:24 UTC 2014 (750023e) x86_64 x86_64 x86_64 GNU/Linux

GNU bash, Version 4.2.45(1)-release (x86_64-suse-linux-gnu)
Copyright (C) 2011 Free Software Foundation, Inc.
# 2  
Old 03-30-2014
Hi, try:
date --date="$(date +%Y%m15) 1 month ago" +%Y%m

This behavior occurs, because februari 30 does not exist. So it is best to use the middle of the month to calculate the previous month..

Interestingly in recent ksh93 this seems to work alright:
$ printf "%(%Y%m)T\n" "last month"

Last edited by Scrutinizer; 03-30-2014 at 12:40 PM..
These 2 Users Gave Thanks to Scrutinizer For This Post:
# 3  
Old 03-30-2014
Originally Posted by Scrutinizer
Hi, try:
date --date="$(date +%Y%m15) 1 month ago" +%Y%m

This behavior occurs, because februari 30 does not exist. So it is best to use the middle of the month to calculate the previous month..

Interestingly in recent ksh93 it seems to work alright:
$ printf "%(%Y%m)T\n" "last month"

Thanks a lot Scrutinizer! I thought that this command i used is working exactly -
unfortunatelly it doesn't.
Thank you,

Last edited by IMPe; 03-30-2014 at 11:50 AM..
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