Audit date(1)

1) Update usage as already done in the manpage
2) group and sort local variable declarations
3) Be pedantic about the number of options. Don't just ignore it
   if argc > 1.

README

@@ -23,7 +23,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =   cp              yes                          none (-i)
 =*  cron            non-posix                    none
 #*  cut             yes                          none
-=*  date            yes                          -u
+=*| date            yes                          none
 =*| dirname         yes                          none
 =*  du              yes                          none
 =*| echo            yes                          none