Code:
typedef struct
{
   uint8_t sec;
   uint8_t min;
   uint8_t hour;
   uint8_t mon;
   uint8_t year;
} time_t;

typedef struct
{
    uint16_t luftdruck;
    uint16_t feuchte_komp;   
    uint16_t temperatur_lin;
} sensor_data_t

typedef struct
{
   time_t time;
   sensor_data_t sensor;
} mess_data_t;

mess_data_t data;
mess_data_t * pdataEE;

pdataEE = (mess_data_t*) 0x2;

eeprom_write_block (&data, pdataEE, sizeof (data));
pdataEE++;