Method for time and time zone synchronization and terminal device

1. A method for time and time zone synchronization, comprising:

determining, by a terminal, whether a network supports a Network Identity and Time Zone (NITZ) function, after the terminal registers with the network or roams to the network; and

prompting, by the terminal, a user that uses the terminal to use a function of automatic time and time zone synchronization, when the terminal determines that the network supports the NITZ function and automatic synchronization is not set for the terminal.

2. The method according to claim 1 , the method further comprising prompting, by the terminal, the user that uses the terminal to manually configure time and a time zone, when the terminal dete mines that the network does not support the NITZ function.

3. The method according to claim 1 , wherein determining, by the terminal, whether the network supports the NITZ function comprises determining, by the terminal according to NITZ information saved by the terminal, whether the network supports the NITZ function, wherein the NITZ information comprises information about whether the network supports the NITZ function.

4. The method according to claim 3 , wherein determining, by the terminal, whether the network supports the NITZ function further comprises monitoring, by the terminal, within a preset duration, a mobility management information delivered by the network to determine whether the network supports the NITZ function.

5. The method according to claim 4 , wherein monitoring, by the terminal, within the preset duration, the mobility management information delivered by the network to determine whether the network supports the NITZ function comprises determining, by the terminal, that the network supports the NITZ function, when the terminal receives, within the preset duration, the mobility management information delivered by the network.

6. The method according to claim 4 , wherein monitoring, by the terminal, within the preset duration, the mobility management information delivered by the network to determine whether the network supports the NITZ function comprises determining, by the terminal, that the network does not support the NITZ function, when the terminal does not receive, within the preset duration, the mobility management information delivered by the network.

7. The method according to claim 5 , further comprising saving, by the terminal, the information about whether the network supports the NITZ function into an NITZ information table, after the terminal determines whether the network supports the NITZ function.

8. The method according to claim 6 , further comprising saving, by the terminal, the information about whether the network supports the NITZ function into an NITZ information table, after the terminal determines whether the network supports the NITZ function.

9. A terminal device, comprising:

a memory storing instructions; and

a processor coupled to the memory to execute the instructions to:

determine whether a network supports a Network Identity and Time Zone (NITZ) function, after the terminal registers with the network or roams to the network; and

prompt a user that uses the terminal to use a function of automatic time and time zone synchronization, when the processor determines that the network supports the NITZ function and automatic synchronization is not set for the terminal.

10. The terminal according to claim 9 , wherein the processor further executes the instructions to prompt a user that uses the terminal to manually configure time and a time zone, when the processor determines that the network does not support the NITZ function.

11. The terminal according to claim 9 , wherein determining whether the network supports the NITZ function comprises determining, according to NITZ information saved in the memory, whether the network supports the NITZ function, wherein the NITZ information comprises information about whether the network supports the NITZ function.

12. The terminal according to claim 11 , wherein determining whether the network supports the NITZ function comprises monitoring, within a preset duration, a mobility management information delivered by the network to determine whether the network supports the NITZ function.

13. The terminal according to claim 12 , wherein monitoring the mobility management information delivered by the network to determine whether the network supports the NITZ function comprises determining that the network supports the NITZ function, when the mobility management information delivered by the network was received within the preset duration.

14. The terminal according to claim 12 , wherein monitoring the mobility management information delivered by the network to determine whether the network supports the NITZ function comprises determining that the network does not support the NITZ function, when the mobility management information delivered by the network was not received within the preset duration.

15. The terminal according to claim 13 , wherein the processor further executes the instructions to save the information about whether the network supports the NITZ function into an NITZ information table, after the processor determines whether the network supports the NITZ function.

16. The terminal according to claim 14 , wherein the processor further executes the instructions to save the information about whether the network supports the NITZ function into an NITZ information table, after the processor determines whether the network supports the NITZ function.