A C structure containing the following fields: typedef struct { ubyte yr; /* year: 0 to 99 */ ubyte mon; /* month: 1 to 12 */ ubyte day; /* day: 1 to 31 */ ubyte wday; /* Day of week: 1 to 07 */ ubyte hr; /* hour: 0 to 23 */ ubyte min; /* minute: 0 to 59 */ ubyte sec; /* second: 0 to 59 */ } date_t; where ubyte is an unsigned byte (0-255).