ARRAY_DATIME
if (checkDateFmt (&bootpref[ARRAY_DATIME], optarg))
bootpref[ARRAY_DATIME] &= ~DATIME_24H;
bootpref[ARRAY_DATIME] |= DATIME_24H;
writeNVRAM (fd, NVRAM_DATIME, bootpref[ARRAY_DATIME]);