adu -h[elp]
adu -E[aster] year
adu -t[today] [count [format]]
adu -c[ount] [date[:datetype]]
adu -l[ast] date[:type] [format]
adu -f[irst] date[:type] [format]
adu -r[eformat] format [date[:type]]
adu -d[ifference] date[:datetype] [date[:datetype]]
adu -n[ext] day (mon, tue, ...) [date[:type] [format]]
adu -p[revious] day (mon, tue, ...) [date[:type] [format]]
adu -C[ompute] [yCOUNT][mCOUNT][wCOUNT][dCOUNT] [date[:type] format]