usage()
{
(void)fprintf(stderr, "%s\n%s\n",
"usage: date [-nu] [-d dst] [-r seconds] [-t west] "
"usage: date [-jnu] [-d dst] [-r seconds] [-t west] "
"[-v[+|-]val[ymwdHMS]] ... ",
" "
"[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");