timezone printing in date messed up?

[perryh at pluto.rain.com]

> $ sh <<'EOF'
> for a in 0 1 2 3 4 5 6 7 8 9 10 11 12 
> do
>   date -j -f %s `expr 1194163200 + 600 \* $a`
> done
> EOF
<snip buggy output>

> OS X Leopard has the same bug ...

How did you test it in Leopard?  I tried it in Tiger, intending to
contribute another data point, and I got:

  date: illegal option -- j
  usage: date [-nu] [-r seconds] [+format]
         date [[[[[cc]yy]mm]dd]hh]mm[.ss]

The Tiger manpage gives no obvious equivalent to FreeBSD's -j