GNU bug report logs - #38003
date --date=-1month gives same month today

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ilja Honkonen <ilja.honkonen <at> fmi.fi>
To: bug-coreutils <at> gnu.org
Subject: date --date=-1month gives same month today
Date: Thu, 31 Oct 2019 10:34:45 +0200

Hello
Please CC me as I'm not on this list. Running date (GNU coreutils) 8.26 
on fedora 30 today (date --utc  -I: 2019-10-31) with --date=-1month gives 
the same month which doesn't make sense:
$ date --utc -I --date=-1month
2019-10-01
I assume using --date=-31day also wouldn't work if run e.g. in beginning 
of march so this looks like a bug. Same happens also without --utc and 
-I. Thanks
Ilja

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