Help to get previous weekday

hawk004

Hi,
do you know how to get previous weekday?
for example

date +'%a' get thu but I want to get wed
and wed get tue
tue get mon

Thanks,

寂寞烈火

if you use linux,then:
date +%a -d '-1 day'

一梦如是

if you did not use linux and had not gnu date,then you can

1. echo `export TZ=GMT+16;date +%a`

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of course,if you did not place in China,you must modify the count  of "$TZ"

hawk004

That's amazing.
Thanks everyone!