dmi_get_date
dmi_get_date(DMI_BIOS_DATE, &year, &month, &date);
dmi_get_date(DMI_BIOS_DATE, &year, &month, &date);
dmi_get_date(DMI_BIOS_DATE, &year, &month, &date);
EXPORT_SYMBOL(dmi_get_date);
exists = dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL);
extern bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp);