NMEA-0183 message: ZDA
UTC day, month, and year, and local time zone offset
An example of the ZDA message string is:
$GPZDA,172809.456,12,07,1996,00,00*45
                                                            
ZDA message fields
| 
                                                                             Field  | 
                                                                        
                                                                             Meaning  | 
                                                                    
|---|---|
| 
                                                                             0  | 
                                                                        
                                                                             Message ID $--ZDA Talker ID can be:  | 
                                                                    
| 
                                                                             1  | 
                                                                        
                                                                             UTC  | 
                                                                    
| 
                                                                             2  | 
                                                                        
                                                                             Day, ranging between 01 and 31  | 
                                                                    
| 
                                                                             3  | 
                                                                        
                                                                             Month, ranging between 01 and 12  | 
                                                                    
| 
                                                                             4  | 
                                                                        
                                                                             Year  | 
                                                                    
| 
                                                                             5  | 
                                                                        
                                                                             Local time zone offset from GMT, ranging from 00 through ±13 hours  | 
                                                                    
| 
                                                                             6  | 
                                                                        
                                                                             Local time zone offset from GMT, ranging from 00 through 59 minutes  | 
                                                                    
| 
                                                                             7  | 
                                                                        
                                                                             The checksum data, always begins with *  | 
                                                                    
Fields 5 and 6 together yield the total offset. For example, if field 5 is -5 and field 6 is +15, local time is 5 hours and 15 minutes earlier than GMT.