TWI431444B - Portable electronic device and automatic time adjusting method therefor - Google Patents

Description

Portable electronic device and its applicable automatic correction time method

The present invention relates to a method for correcting time, and more particularly to a portable electronic device and an automatic time correction method thereof.

With the rapid development of the electronics industry, portable electronic devices are indispensable for most people because of their slimness, shortness, and portability. Common portable electronic devices include, for example, mobile phones and personal digital assistants. (PDA) and notebook computers. Portable electronic devices usually have a variety of different functions, so that users can obtain the information and convenience provided by these functions according to their needs. Among them, time function is a very common and important one, which can be provided immediately. Time message for the user to handle time related transactions.

Although the current portable electronic device has the function of displaying time, it does not have a mechanism for automatically correcting the time. Therefore, when the portable electronic device is used for the first time, or if, for example, the battery power is insufficient or the battery is turned off, the system is turned off. When it is turned back on for a while, the time it displays is usually inaccurate with the correct local time.

What's more, when the user carries the portable electronic device to travel or move in a country or region that changes the time zone or the daylight saving time zone, for example, the A zone goes to the B zone which is sometimes inferior to the A zone, or Country C goes to C country sometimes or has implementation In the D country of the daylight saving time mechanism, since the portable electronic device does not have a mechanism for automatically adjusting and correcting the time setting, when the user arrives in the B area or the D country, the time displayed by the portable electronic device Or the setting still corresponds to the time of the user's previous A or C country, and the time cannot be automatically adjusted and corrected to the local correct time of the current B or D country or the daylight saving time in country D. The time after the change is automatically corrected at the time of stop.

As can be seen from the above, since the portable electronic device does not have a mechanism for automatically correcting the time, when the portable electronic device encounters the above situation, the time and setting displayed by the portable electronic device are bound to be inaccurate and inaccurate, resulting in the user. It is necessary to first check the correct time and then manually adjust and correct the time and setting of the portable electronic device, thus causing inconvenience to the user.

The purpose of the present invention is to provide a portable electronic device and an automatic time correction method thereof, which can provide a one-way and simple time, date, time zone information receiving, automatic synchronization adjustment and correction time setting mechanism, and improve the use of the device. Convenience.

In order to achieve the above object, a more general implementation of the present invention provides a method for automatically correcting time of a portable electronic device, comprising at least the steps of: (a) receiving a digital broadcast signal to capture a time offset included in the digital broadcast signal; (b) storing at least one time information obtained by the time offset table, including: immediate date and time information of the area, real time zone information of the area, and the next daylight saving time change of the area (b) the time correction and setting of the portable electronic device by the stored time information; and (d) the time after the recalibration setting is displayed and date.

To achieve the above objective, another broad aspect of the present invention provides a portable electronic device including at least a digital broadcast receiver configured to receive a digital broadcast signal and capture a time offset included in the digital broadcast signal. The controller is configured to obtain at least one time information from the time offset table, the time information including: immediate date and time information of the area, the instant time zone information of the area, and the date of the next daylight saving time change of the area And at least one of time and time zone information, the controller uses the time information to obtain a first corrected date and time information or a second corrected date and time information; the instant clock circuit is provided The instant date and time information is corrected by the instant clock circuit according to the first corrected date and time information or the second corrected date and time information; the storage system is stored in the storage system. Device preset time zone information, real-time date and time information of the area, instant time zone of the area And at least one of the date and time of the next daylight saving time change and the time zone information in the area; and the display displays the date and time based on the device's immediate date and time information, wherein the controller is stored in the store The time difference of the time information of the device is controlled to control the time difference of the portable electronic device to perform automatic time correction and setting.

The first figure is a schematic diagram of the circuit structure of the portable electronic device of the preferred embodiment of the present invention.

The second figure is a flow chart of the method for automatically correcting time in the time offset table of the digital broadcast signal by the portable electronic device shown in the first figure.

Third figure: it is a sub-step of step S3 shown in the second figure.

Fourth figure: it is a sub-step of step S4 shown in the second figure.

Fifth Figure: It is a sub-step of step S5 shown in the second figure.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in the various aspects of the present invention, and the description and illustration are in the nature of

Please refer to the first figure, which is a circuit block diagram of a portable electronic device according to a preferred embodiment of the present invention. As shown in the first figure, the portable electronic device 1 of the present invention may be, but not limited to, a mobile phone, a personal digital assistant (PDA) or a notebook computer, and includes a digital video broadcasting (DVB) receiver 11 . The controller 12, a Real Time Clock (RTC) circuit 13, a memory 14, and a display 15. The digital broadcast receiver 11 is configured to receive a digital broadcast signal S _DVB transmitted by a digital broadcast service network (not shown) conforming to the digital broadcast service information (Service Information) specification. The instant clock circuit 13 provides an instant date and time information of the device by means of continuous counting. The device preset time zone information stored in the memory 14 represents the time zone set by the portable electronic device 1, and the device instant date and time. The information system represents the date and time currently displayed by the portable electronic device 1.

The controller 12 is electrically connected to the digital broadcast receiver 11, the instant clock circuit 13, the storage 14 and the display 15. The controller 12 decodes the digital broadcast signal S _DVB received by the digital broadcast receiver 11 to capture A time offset table (TCOT) included in the digital broadcast signal S _DVB , and then using the world standard time (UTC_time) parameter defined in the time offset table to obtain instant date and time information of a local area, Using the country_code parameter, the local time offset polarity (local_time_offset_polarity) parameter, and the local time offset (local_time_offset) parameter defined in the time offset table, the real-time time zone information of a region is obtained, and the time variation (time_of_change) parameter is utilized. The local time offset polarity (local_time_offset_polarity) parameter and the next time offset (next_time_offset) parameter obtain the date and time of change of the next daylight saving time in a region and the time zone information, and the above three time offset tables are used. The acquired time information is stored in the storage unit 14 respectively.

In addition, the controller 12 further compares the real-time date and time information of the local area stored in the storage unit 14, the real-time time zone information of the local area, and the next daylight saving time change date and time and the changed time zone information of the area and the instant clock circuit. 13 provides instant date and time information of the device and/or device preset time zone information stored in the memory 14 as a time or time zone difference comparison, and provides the comparison result to the instant clock circuit 13 so that the instant clock circuit 13 can be compared according to the comparison. The result corrects the device's immediate date and time information. The display 15 receives the date and time information of the device provided by the instant clock circuit 13 to display the date and time.

In some embodiments, the controller 12 can be a central processing unit (CPU) and can operate at a frequency of 19.2 MHz, but is not limited thereto. The instant clock circuit 13 can be, but is not limited to, counted with a low frequency clock signal, such as 32.768 KHz. In addition, the memory 14 can be a flash memory and stored with a device preset time zone information, and the display 15 can be a liquid crystal display (LCD), but not limited thereto.

In other embodiments, the digital broadcast signal S _DVB can be a Digital Video Broadcasting-Terrestrial (DVB-T), a Digital Video Broadcasting-Handheld (DVB-H), a digital satellite. Digital Video Broadcasting-Satellite (DVB-S), Digital Video Broadcasting-Satellite services to Handheld devices (DVB-SH) or the Association of Radio Industries and Business (Association of Radio Industries and Business: ARIB) is one of the signals of Integrated Service Digital Broadcasting-Terrestrial (ISDB-T), but not limited to this, as long as the digital broadcast signal S _DVB has information conforming to digital video broadcasting services ( The time offset table specified by Digital Video Broadcasting-Service Information: DVB-SI) is within the scope of this case.

In this embodiment, the date or time displayed by the portable electronic device 1 (the date and time information of the device provided by the instant clock circuit 13) and the date or time of the region (ie, stored in the storage 14) There is an error in the immediate date and time information of the area in which it is located, for example, because the portable electronic device 1 is used for the first time, or when the battery is powered off or down for a period of time and is restarted, it is portable. The electronic device 1 can automatically synchronize the correction time by using the real-time date and time information of the local area obtained by the world standard time parameter defined in the time offset table of the digital broadcast signal S _DVB .

In addition, when the portable electronic device 1 is carried from the original place to other regions or countries having a time difference from the original place, the time displayed by the portable electronic device 1 is caused by the time difference and the actual area or country reached. When there is an error in time, the portable electronic device 1 can obtain the location obtained by the country code parameter, the local time offset polarity parameter and the local time offset parameter defined in the time offset table of the digital broadcast signal S _DVB . Instant time zone information for the zone to automatically synchronize the correction time.

Moreover, when the portable electronic device 1 is carried to a country where daylight saving time is implemented, the time displayed by the portable electronic device 1 is incorrect because the country starts to implement the daylight saving time, the portable electronic device The device 1 can use the time variation parameter defined by the time offset table of the digital broadcast signal S _DVB , the local time offset polarity parameter and the next time offset parameter to obtain the next daylight saving time change date of the area in the area. Automatically correct time and settings with time and time zone information.

Therefore, the portable electronic device 1 of the present invention utilizes a plurality of different information obtained by using a plurality of parameters defined by the time offset table of the digital broadcast signal S _DVB to provide instant date and time information of the device provided by the instant clock circuit 13 and / or the device preset time zone information stored in the storage 14 is compared to achieve automatic synchronization adjustment and correction date and time setting mechanism.

Please refer to the second figure and cooperate with the first figure. The second figure is a flow chart of the method for automatically correcting the date and time by the portable electronic device 1 shown in the first figure by using the time offset table of the digital broadcast signal. As shown in the first and second figures, first, in step S1, the portable electronic device 1 receives the digital broadcast signal S _DVB by the digital broadcast receiver 11 to enable the controller 12 to capture the digital broadcast signal S _{DVB .} Time offset table. Then, in step S2, the controller 12 obtains the real-time date and time information of the local area by the world standard time parameter defined by the time offset table, and the country code parameter and the local time offset polarity parameter defined by the time offset table. And the local time offset parameter obtains the real-time time zone information of the region, and the time variation parameter, the local time offset polarity parameter and the next time offset parameter defined in the time offset table obtain the next daylight saving time change of the region in the region The date and time and the time zone information are changed, and the above three kinds of information obtained by the time offset table are stored in the storage 14.

Then, in step S3, the controller 12 uses the real-time time zone information of the area stored in the storage 14 to determine whether the portable electronic device 1 has a time zone variation difference, so as to automatically correct the time-time zone difference for the instant clock circuit 13. . Then, in step S4, the controller 12 uses the instant date and time information of the local area stored in the storage unit 14 to determine whether the date and time of the area set by the portable electronic device 1 is correct, for performing on the instant clock circuit 13. The date and time of the area is automatically corrected. Then, in step S5, the controller 12 uses the next daylight saving time change date and time and the changed time zone information of the area stored in the storage 14 to determine whether the portable electronic device 1 has a daylight saving time change requirement. The daylight saving variation time difference is automatically corrected for the instant clock circuit 13. Finally, in step S6, the display 15 displays the date and time after the recalibration setting based on the device immediate date and time information provided by the instant clock circuit 13.

Of course, in the above embodiment, the portable electronic device 1 can be further configured to re-execute step S1 after performing step S6, and the interval between the execution of step S6 and the re-execution of step S1 can also be set to It is selected by the user, but not limited to this.

Moreover, in some embodiments, as shown in the third figure, step S3 may further have a plurality of sub-steps S31-S33. First, in step S31, the controller 12 compares the real time zone information of the area stored in the storage 14 with the device preset time zone information to determine the real time zone information of the area and the device preset time zone information. Whether or not there is a difference in time zone variation, and if the result of the determination is negative, the process of step S4 shown in the second figure is continued.

On the other hand, if the result of the determination is yes, step S32 is performed, that is, the controller 12 calculates the time zone difference between the real time zone information of the area and the preset time zone information of the device to obtain a first corrected date and time information. Provided to the instant clock circuit 13. Then, in step S33, the instant clock circuit 13 changes the count value according to the result transmitted by the controller 12, that is, corrects the date and time information of the device of the instant clock circuit 13 according to the date and time information of the first correction, Finally, step S4 shown in the second figure is continued.

In some embodiments, as shown in the fourth figure, step S4 may also have a plurality of sub-steps S41-S43. First, in step S41, the controller 12 compares the current date and time information of the local area stored in the storage 14 with the instant date and time information provided by the instant clock circuit 13 to determine the immediate date and time of the area. Whether there is a difference in date between the information and the device's real-time date and time information, or whether the time difference between the date and time information of the area and the instant date and time information of the device is greater than a preset time set by the controller 12. The allowable value, if the result of the determination is negative, continues to execute step S5 shown in the second figure.

On the other hand, if the result of the determination is yes, step S42 is performed, that is, the controller 12 supplies the immediate date and time information of the area to the instant clock circuit 13. Then, in step S43, the instant clock circuit 13 changes the count value according to the result transmitted by the controller 12, and corrects the date and time information of the device according to the real date and time information of the area, and finally continues to execute the first Step S5 shown in the second figure.

Moreover, in other embodiments, as shown in the fifth figure, step S5 may also have a plurality of sub-steps S51-S54. First, in step S51, the controller 12 changes the date and time and time of the next daylight saving time according to the region stored in the storage 14. The time zone information is used to determine whether the portable electronic device 1 has a daylight saving time change requirement. If the result of the determination is negative, the step S6 shown in the second figure is continued.

On the other hand, if the result of the determination is yes, step S52 is executed, that is, the controller 12 will immediately display the date and time information of the next daylight saving time of the area stored in the memory 14 with the device provided by the instant clock circuit 13. The date and time information are compared to further determine whether the date and time of the current portable electronic device 1 has reached the date and time of the next daylight saving time change. If the result of the determination is negative, step S52 is re-executed. On the other hand, if the result of the determination is yes, step S53 is performed, that is, the controller 12 compares the time zone difference between the time zone change information of the next daylight saving time in the area and the preset time zone information of the device, and calculates a second. The corrected date and time information is provided to the instant clock circuit 13. Then, in step S54, the instant clock circuit 13 changes the count value according to the result transmitted by the controller 12, that is, according to the date and time information of the second correction obtained, the instant date and time information of the device of the instant clock circuit 13 is performed. Correction and setting, and finally, proceed to step S6 shown in the second figure.

The following is an example to illustrate that the portable electronic device 1 uses the real-time time zone information of the region in the time offset table of the digital broadcast signal S _DVB to perform automatic correction of the time difference between time zones, and utilizes the time offset table. Get instant date and time information of the local area to automatically synchronize the date and time of the area, and use the time offset table to change the date and time of the next daylight saving time in the area and time zone information for daylight saving The change in the time difference is automatically corrected.

For example, suppose the portable electronic device 1 is in the A area, and the device 14 is configured to set the time zone information of the device in the A area to be the world standard time +8, when the portable electronic device 1 is carried to and from When the A area has a time zone B, at this time, the digital broadcast receiver 11 of the portable electronic device 1 receives the digital broadcast signal S _DVB transmitted by the digital broadcast service network of the B area, and the controller 12 The time offset table of the digital broadcast signal S _{DVB is} captured (step S1 of the second figure), and then the controller 12 will immediately obtain the date and time information of the area obtained by the time offset table, and the real time zone information of the area. And the next daylight saving time change date and time and the changed time zone information of the area are stored in the storage 14 (as in step S2 of the second figure), and the instant time zone information of the area stored in the storage 14 at this time is That is, the real time zone information of the B zone is assumed to be +1 of the world standard time. Then, the controller 12 compares the time zone information of the B area stored in the storage 14 with the preset time zone information stored by the storage device 14 with a time zone variation difference, that is, the B area is behind the A area for 7 hours (eg, In step S31), the controller 12 supplies the result of the comparison, that is, the correct date and time information after the time zone difference correction is calculated by the B zone behind the 7-hour time zone difference of the A zone to the instant clock circuit 13 (step S32). Then, the instant clock circuit 13 changes the count value according to the result of the controller 12 to correct the date and time information of the provided device to 7 hours behind (step S33), so that the cross is completed. The time zone time difference is automatically corrected and set.

For example, when the portable electronic device 1 completes step S3 and continues to perform step S4, the instant time zone information of the area stored in the storage device 14 represents the current portable electronic device 1 The correct date and time in the area is 14:50 on March 20, 2010. However, the display 15 of the portable electronic device 1 displays the date and time according to the instant date and time information provided by the instant clock circuit 13. At 14:20 on March 20, 2010, at this time, the controller 12 will store the date and time information of the area stored in the storage unit 14, ie, March 20, 2010, 14:50, with the instant clock circuit. 13 information on the date and time of the device provided, ie At 14:20 on March 20th, 2010, the comparison was made, and it was judged that there was a difference of 30 points between the two, and the difference of the 30 points was greater than the time allowable value preset by the controller 12, for example, 5 minutes. (Step S41), the controller 12 provides the instant date and time information of the area in which the storage 14 is stored to the instant clock circuit 13 (step S42). The instant clock circuit 13 changes the count value according to the result transmitted by the controller 12, and corrects the instant date and time information of the provided device according to the current date and time information of the area, which is about 14 o'clock on March 20, 2010. The 20 points are corrected to 14:50 on March 20, 2010 (as in step S43). In this way, the local date and time are automatically corrected.

For example, when the portable electronic device 1 completes step S4 and continues to perform step S5, and assumes that the storage device 14 of the portable electronic device 1 stores the preset time zone information of the device set in the C region. The world standard time is +1, and the time currently counted by the instant clock circuit 13 is 2:0:0 on March 30, 2010, and the next daylight saving time change date of the area stored in the storage 14 is The time and time zone information indicates that the daylight saving change date and time in the region is 2:0:00 on March 30, 2010, and the time zone information is the world standard time +2. At this time, the controller 12 will store according to the time. The next daylight saving time change date and time of the area stored in the device 14 and the time zone information are changed to determine that the C area performs the daylight saving time (step S51), and then the controller 12 stores the stored in the memory 14. The date and time of the next daylight saving time change and the time zone information in the area are compared with the instant date and time information provided by the instant clock circuit 13, and the current instant clock is determined. 13 The date and time information of the device provided, that is, the date and time of the next daylight saving change at 2:0:00 on March 30, 2010, ie, March 30, 2010, 2:0:00, (as in step S52). At this point, the controller 12: The time zone difference between the time zone change information of the next daylight saving time change time zone information stored in the storage area 14 and the preset time zone information of the device is calculated, and the date and time information corrected by the daylight saving time zone difference variation is provided to the instant clock circuit 13 (as in step S53). Then, the instant clock circuit 13 changes the count value according to the result transmitted by the controller 12, and uses the corrected date and time information calculated according to the difference of the time zone information of the next daylight saving time in the region to set the device date and time. The time information is corrected, that is, at 2:0:00 on March 30, 2010, the time is corrected to 3:0:00 on March 30, 2010 (step S54). In this way, the time difference of the daylight saving change time is automatically corrected.

In summary, the present invention provides an automatic correction time method for a portable electronic device, which receives a digital broadcast signal in a unidirectional manner to capture a time offset table in a digital broadcast signal, and utilizes the time offset. The parameters such as the world standard time parameter, the country code parameter, the local time offset polarity parameter, the local time offset parameter, the time variation parameter, the local time offset polarity parameter, and the next time offset defined in the shift table are used to perform the date and Time correction, so when the portable electronic device is restarted after encountering, for example, a period of shutdown, being carried by the A area in the same country to the B area having a time difference with the A area, or being When carrying a trip to country D with time difference or a daylight saving time mechanism, the date and time provided by the instant clock circuit can be automatically corrected according to the correct date and time of the area. The convenience of the portable electronic device can be greatly improved.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

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The S1~S6‧‧‧ portable electronic device uses the time offset table of the digital broadcast signal to automatically correct the time method

Claims (9)

A method for automatically correcting time of a portable electronic device, comprising: (a) receiving a digital broadcast signal to capture a time offset table included in the digital broadcast signal; (b) storing by the time offset table At least one time information obtained, such as: immediate date and time information of a local area, real time zone information of a local area, and date and time of change of the next daylight saving time in a region and time zone information; (c And (d) displaying the time and date after re-correcting the setting by using the time information to perform time correction and setting of the portable electronic device; The method for automatically correcting time of a portable electronic device according to claim 1, wherein the digital broadcast signal is a digital terrestrial broadcast television system signal, a digital mobile broadcast television system signal, and a digital satellite broadcast television. System signal, a digital satellite mobile handheld broadcast television system signal or an integrated digital service terrestrial broadcast system signal. The automatic correction time method of the portable electronic device of claim 1, wherein the step (c) further comprises the step of: (c1) determining the portability by using the stored real time zone information of the area; Whether the electronic device has a time difference in the area to automatically correct the time difference between time zones; (c2) determining whether the date and time of the area set by the portable electronic device is determined by the stored date and time information of the area Correct to automatically correct the date and time of the region; and (c3) the date and time of the next daylight saving time change by the region in which it is stored and The time zone information is determined to determine whether the portable electronic device has a daylight saving time variation requirement, so as to automatically correct the time difference of the daylight saving change. The method for automatically correcting time of a portable electronic device according to claim 3, wherein the real-time date and time information of the local area is obtained by a world standard time defined in the time offset table, where the area is The real-time time zone information is obtained by a country code parameter, a local time offset polarity parameter and a local time offset parameter defined in the time offset table, and the date and time of the next daylight saving time change in the area and The changed time zone information is obtained by a time variation parameter defined in the time offset table, the local time offset polarity parameter, and a next time offset parameter. The method for automatically correcting time of a portable electronic device according to claim 3, wherein the portable electronic device comprises a digital broadcast receiver, a controller, an instant clock circuit, a storage device and a display The digital broadcast receiver is configured to receive the digital broadcast signal, and the instant clock circuit provides an instant date and time information of the device, and the storage device is configured to store a preset time zone information of the device, and an instant date and time of the local area. The information, the real-time time zone information of the area and the date and time of the next daylight saving time change and the time zone information of the area, the display shows the date and time based on the instant date and time information of the device. The automatic correction time method of the portable electronic device according to claim 5, wherein the step (c1) further comprises the sub-step: (c11) the controller is to store the stored real-time time zone information of the area The device presets time zone information for comparison to determine whether there is a time zone variation difference between the real time zone information of the location and the preset time zone information of the device; (c12) when the result of the determination is yes, the controller calculates a time zone difference between the real time zone information of the location and the preset time zone information of the device to obtain a first corrected date and time information, and providing the first corrected date and time information to the instant clock circuit; When the result of the determination is no, step (c2) is performed; and (c13) the instant clock circuit is based on the date and time information of the first correction, and the device is Time and time information is corrected. The automatic correction time method of the portable electronic device according to claim 5, wherein the step (c2) further comprises the substep: (c21) the controller is to store the current date and time information of the local area. Comparing with the immediate date and time information of the device to determine whether there is a difference in date between the immediate date and time information of the local area and the immediate date and time information of the device, or whether the time difference between the two is greater than the a time allowance value preset by the controller; (c22) when the result of the determination is YES, the controller provides the instant date and time information of the local area to the instant clock circuit; when the result of the determination is no, Step (c3) is performed; and (c23) the instant clock circuit corrects the device's immediate date and time information based on the immediate date and time information of the area. The method for automatically correcting time of a portable electronic device according to claim 5, wherein the step (c3) further comprises the substep: (c31) the controller is based on the stored next daylight saving of the area The time change date and time and the change time zone information determine whether the portable electronic device has a daylight saving time change requirement; (c32) when it is determined that there is a daylight saving time change requirement, the controller stores the stored area under the area Comparing the date and time of the daylight saving time change with the time and time information of the device to determine whether the date and time of the current portable electronic device has reached the date and time of the next daylight saving time change; When it is determined that there is no need for daylight saving time variation, step (d) is performed; (c33) when it is determined that the date and time of the next daylight saving time change is reached, the controller calculates the next daylight saving time change of the region Time zone information between the time zone information and the preset time zone information of the device to obtain a second corrected date and time information to provide The real time clock circuit; not determined when the arrival time of a daylight saving date and time of change, the re-execution sub Step (c32); and (c34) the instant clock circuit corrects the device immediate date and time information based on the date and time information of the second correction. A portable electronic device comprising: a digital broadcast receiver configured to receive a digital broadcast signal and capture a time offset table included in the digital broadcast signal; a controller is configured by the The time offset table obtains at least one time information including: an instant date and time information of a local area, an instant time zone information of a region, and a date and time of change of the next daylight saving time in a region and a time zone information The controller uses the time information to obtain a first corrected date and time information or a second corrected date and time information; an instant clock circuit is configured to provide a device instant date and time information, The instant clock circuit corrects the date and time information of the device according to the date and time information of the first correction or the date and time information of the second correction; a memory is configured to store a preset time zone information of the device Instant date and time information of the area, instant time zone information of the area and under the area Daylight saving time and the date and time change information for the variation of any of the at least one; and a display apparatus according to the instant system date and time to display the date and time information.