git annotate with date option not working?

hello,

can anyone confirm that this "--date" option is working for git annotate 
cmd.

i tried the same option on blame cmd which seems to be working, but not 
on the annotate which i use git annotate --date=relative or i wrote date 
config variable as blame.date which again work for blame but not 
annotate, but document says it should share same variable.

my env:
ubuntu 11.04 64
git ppa source 1.7.5.2

Regards