Help me I want chang date time in SunOS 5

UNIX Solaris
1

I want chang date time current to last month
ex

date 
current date 
YESTERDAY=`TZ=GMT date +%Y-%m-%d`; echo $YESTERDAY
2015-11-05

I want to

2015-10-05

chang last mount

sun can not use

QMONTH=`date +'%Y%m' -d 'last month'`

help me pls.
Thank you

2

you can:

a. install GNU coreutils package
b. install newer korn shell

3

@agent.kgb a. will indeed work but what makes you feel b. would help?

4

@jlliagre

$ echo ${.sh.version}
Version M 93t+ 2009-05-01
$ printf "%T\n" now
Fri Nov  6 10:47:33 CET 2015
$ printf "%T\n" yesterday
Thu Nov  5 00:00:00 CET 2015
$ printf "%T\n" "last month"
Thu Oct  1 00:00:00 CEST 2015
1 Like
5

Thanks for the tip !

That was deserving an explanation. I only checked if ksh provides a date builtin which it doesn't .