Here is my issue: I have a backup bash script that needs to access a folder with a date in its name for example : backup\_01072022 .

I used `date=`TZ=GMT+24 date +%d%m%Y``  when i needed to access the backup folder of yesterday.

Now I want to access the backup folder of last week :

`date=`TZ=GMT+168 date +%d%m%Y``  , it doesn't work , it show today's date.

I read that TZ doesn't work for a value above +144.

Is there any other way of manipulating dates in **SunOS 6.8** ?

**Notes :**

SunOS 6.8

version of the `date` util : 8.5

version of bash : 4.1.11(2)-release