Bug in GNU Date 2.0.11

[Anthony Valentine]

Hello. 

It looks like I have found a bug in GNU date 2.0.11 (which appears to be
the latest version). 

address@hidden /home/amv]# date --version 
date (GNU sh-utils) 2.0.11 


The bug occurs with the '-d' switch when asked for the 'last
[weekday]'.  I have played with it a bit and it seems to only happen
during this week (week of 4/7/02).  

Here are some examples:
address@hidden /home/amv]# date
Sun Apr  7 07:57:31 AKDT 2002

address@hidden ~]$ date -d 'last friday' +%A 
Thursday 
address@hidden ~]$ date -d 'last thursday' +%A 
Wednesday 
address@hidden ~]$ date -d 'last wednesday' +%A 
Tuesday 

address@hidden /home/amv]# date -s "Sun Apr  9 07:57:31 2002" 
Tue Apr  9 07:57:31 AKDT 2002 
address@hidden /home/amv]# date -d 'last friday' +%A 
Thursday 
address@hidden /home/amv]# date -d 'last thursday' +%A 
Wednesday 
address@hidden /home/amv]# date -d 'last wednesday' +%A 
Tuesday 

address@hidden /home/amv]# date -s "Tue Apr 10 07:57:31 2002" 
Wed Apr 10 07:57:31 AKDT 2002 
address@hidden /home/amv]# date -d 'last friday' +%A 
Thursday 

address@hidden /home/amv]# date -s "Sat Apr 13 07:57:31 2002" 
Sat Apr 13 07:57:31 AKDT 2002 
address@hidden /home/amv]# date -d 'last friday' +%A 
Friday 

address@hidden /home/amv]# date -s "Sat Apr 01 07:57:31 2002" 
Sat Apr 13 07:57:31 AKDT 2002 
address@hidden /home/amv]# date -d 'last friday' +%A 
Friday

So, if I change the date outside of this week, it works, otherwise it
reports the day before the correct day.

I can reproduce the problem on a GNU/Linux system (RedHat 7.2) and an
AIX system.

Hopefully I have given you enough info, but if not, please do not
hesitate to contact me.  I can be reached at address@hidden

Thanks!

Anthony Valentine