Radio-controlled timepiece, electronic device, time correcting method and computer product

1. A radio-controlled timepiece comprising:

a regional-information storage unit that stores information relating to a target time region;

a standard-frequency receiving unit that receives a standard frequency signal that includes Coordinated Universal Time (UTC) information;

a time calculating unit that calculates current time in the target time region based on the information stored in the regional-information storage unit and information in the standard frequency signal received by the standard-frequency receiving unit;

a time display unit that displays the current time; and

a display-time correcting unit that corrects at a predetermined timing the current time to be displayed in Daylight Saving Time (DST) at the time display unit when information on a switching day to DST is included in the information in the standard frequency signal received by the standard-frequency receiving unit,

wherein the predetermined timing is determined based on the current time calculated by the time calculating unit.

2. The radio-controlled timepiece according to claim 1 , wherein if the current time calculated is

after a time corresponding to 0 O'clock in UTC time, and

before a switching time to DST that is registered in advance,

the display-time correcting unit does not correct the current time until the switching time to DST comes.

3. The radio-controlled timepiece according to claim 2 , wherein the switching time to DST is A.M. 2:00:00 in standard time.

4. The radio-controlled timepiece according to claim 1 , wherein if the current time calculated is

after a switching time to DST, and

before a time corresponding to 0 O'clock in UTC time,

the display-time correcting unit corrects the current time that has been displayed by adding one hour thereto.

5. The radio-controlled timepiece according to claim 4 , wherein the switching time to DST is A.M. 2:00:00 in standard time.

6. The radio-controlled timepiece according to claim 1 , wherein the switching day to DST is the first Sunday of April.

7. The radio-controlled timepiece according to claim 1 , wherein the time display unit includes

a minute hand;

an hour hand; and

an hour-hand driving unit that drives the hour hand independently from the minute hand, and the hour-hand driving unit drives to set the hour hand forward one hour when the display time is corrected by adding one hour by the display-time correcting unit.

8. The radio-controlled timepiece according to claim 1 , further comprising a regional-information input unit to input the information relating to the target time region, wherein

the regional-information storage unit stores the information input by the regional-information input unit.

9. The radio-controlled timepiece according to claim 1 , further comprising:

an antenna communicatively connected to the standard-frequency receiving unit, the antenna being configured to receive the standard frequency signal as a signal propagating over the air.

10. A radio-controlled timepiece comprising:

a regional-information storage unit that stores information relating to a target time region;

a standard-frequency receiving unit that receives a standard frequency signal that includes Coordinated Universal Time (UTC) time information;

a time calculating unit that calculates current time in the target time region based on the information stored in the regional-information storage unit and information in the standard frequency signal received by the standard-frequency receiving unit;

a time display unit that displays the current time; and

a display-time correcting unit that corrects at a predetermined timing the current time to be displayed in standard time at the time display unit when information on a switching day to standard time is included in the information in the standard frequency signal received by the standard-frequency receiving unit,

wherein the predetermined timing is determined based on the current time calculated by the time calculating unit.

11. The radio-controlled timepiece according to claim 10 , wherein if the current time calculated is

after a time corresponding to 0 O'clock in UTC time, and

before a switching time to standard time that is registered in advance,

the display-time correcting unit does not correct the current time until the switching time to standard time comes.

12. The radio-controlled timepiece according to claim 11 , wherein the switching time to standard time is A.M. 2:00:00 in DST.

13. The radio-controlled timepiece according to claim 10 , wherein if the current time calculated is

after a switching time to standard time, and

before a time corresponding to 0 O'clock in UTC time,

the display-time correcting unit corrects the current time that has been displayed by subtracting one hour therefrom.

14. The radio-controlled timepiece according to claim 13 , wherein the switching time to standard time is A.M. 2:00:00 in DST.

15. The radio-controlled timepiece according to claim 10 , wherein the switching day to standard time is the last Sunday of October.

16. The radio-controlled timepiece according to claim 10 , wherein the time display unit includes

a minute hand;

an hour hand; and

an hour-hand driving unit that drives the hour hand independently from the minute hand, and the hour-hand driving unit drives to set the hour hand back one hour when the display time is corrected by subtracting one hour by the display-time correcting unit.

17. The radio-controlled timepiece according to claim 10 , further comprising a regional-information input unit to input the information relating to the target time region, wherein

the regional-information storage unit stores the information input by the regional-information input unit.

18. The radio-controlled timepiece according to claim 10 , further comprising:

an antenna communicatively connected to the standard-frequency receiving unit, the antenna being configured to receive the standard frequency signal as a signal propagating over the air.

19. An electric device with a radio-controlled timepiece comprising

a regional-information storage unit that stores information relating to a target time region;

a standard-frequency receiving unit that receives a standard frequency signal that includes Coordinated Universal Time (UTC) information;

a time calculating unit that calculates current time in the target time region based on the information stored in the regional-information storage unit and information in the standard frequency signal received by the standard-frequency receiving unit;

a time display unit that displays the current time; and

a display-time correcting unit that corrects at a predetermined timing the current time to be displayed in Daylight Saving Time (DST) at the time display unit when information on a switching day to DST is included in the information in the standard frequency signal received by the standard-frequency receiving unit,

wherein the predetermined timing is determined based on the current time calculated by the time calculating unit.

20. The electric device according to claim 19 , further comprising:

an antenna communicatively connected to the standard-frequency receiving unit, the antenna being configured to receive the standard frequency signal as a signal propagating over the air.

21. An electric device with a radio-controlled timepiece comprising

a regional-information storage unit that stores information relating to a target time region;

a standard-frequency receiving unit that receives a standard frequency signal that includes Coordinated Universal Time (UTC) time information;

a time calculating unit that calculates current time in the target time region based on the information stored in the regional-information storage unit and information in the standard frequency signal received by the standard-frequency receiving unit;

a time display unit that displays the current time; and

a display-time correcting unit that corrects at a predetermined timing the current time to be displayed in standard time at the time display unit when information on a switching day to standard time is included in the information in the standard frequency signal received by the standard-frequency receiving unit,

wherein the predetermined timing is determined based on the current time calculated by the time calculating unit.

22. The radio-controlled timepiece according to claim 21 , further comprising:

an antenna communicatively connected to the standard-frequency receiving unit, the antenna being configured to receive the standard frequency signal as a signal propagating over the air.

23. A time correcting method comprising:

receiving a standard frequency signal that includes Coordinated Universal Time (UTC) time information;

calculating current time of a target time region based on information relating to the target time region and information included in the standard frequency signal received;

correcting, at a predetermined timing, the current time to time in Daylight Saving Time (DST) when information on a switching day to DST is included in the standard frequency signal; and

displaying the current time,

wherein the predetermined timing is determined based on the current time calculated by the calculating step.

24. The time correcting method according to claim 23 , wherein the receiving step comprises receiving, by an antenna communicatively connected to a standard-frequency receiving unit, the standard frequency signal, as a signal propagating over the air.

25. A time correcting method comprising:

receiving a standard frequency signal that includes Coordinated Universal Time (UTC) time information;

calculating current time of a target time region based on information relating to the target time region and information included in the standard frequency signal received;

correcting, at a predetermined timing, the current time to time in standard time when information on a switching day to standard time is included in the standard frequency signal; and

displaying the current time,

wherein the predetermined timing is determined based on the current time calculated by the calculating step.

26. The time correcting method according to claim 25 , wherein the receiving step comprises receiving, by an antenna communicatively connected to a standard-frequency receiving unit, the standard frequency signal, as a signal propagating over the air.

27. A computer-readable recording medium that stores a computer program which when executed on a computer makes the computer perform the steps of:

receiving a standard frequency signal that includes Coordinated Universal Time (UTC) time information;

calculating current time of a target time region based on information relating to the target time region and information included in the standard frequency signal received;

correcting, at a predetermined timing, the current time to time in Daylight Saving Time (DST) when information on a switching day to DST is included in the standard frequency signal; and

displaying the current time,

wherein the predetermined timing is determined based on the current time calculated by the calculating step.

28. A computer-readable recording medium that stores a computer program which when executed on a computer makes the computer perform the steps of:

receiving a standard frequency signal that includes Coordinated Universal Time (UTC) time information;

calculating current time of a target time region based on information relating to the target time region and information included in the standard frequency signal received;

correcting, at a predetermined timing, the current time to time in standard time when information on a switching day to standard time is included in the standard frequency signal; and

displaying the current time,

wherein the predetermined timing is determined based on the current time calculated by the calculating step.