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A device and method for automatically building a database for a home zone service in a mobile communication system. The device comprising a memory and processing unit, wherein the memory includes an address location database for storing latitude and longitude data corresponding to respective address

A device and method for automatically building a database for a home zone service in a mobile communication system. The device comprising a memory and processing unit, wherein the memory includes an address location database for storing latitude and longitude data corresponding to respective addresses, and a zone database for storing zone data for the respective locations, and wherein processor includes a client registration processor for creating a client database in the memory upon the receipt of client information, and a database processor for searching the address location database for the latitude and longitude information corresponding to the client's address when the registration of a new client is requested by the client registration processor, for searching the zone database for zone data for a location corresponding to the latitude and longitude information, and for creating a home zone database in the memory by taking the zone data as the home zone data for the client.

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A device and method for automatically building a database for a home zone service in a mobile communication system. The device comprising a memory and processing unit, wherein the memory includes an address location database for storing latitude and longitude data corresponding to respective address

A device and method for automatically building a database for a home zone service in a mobile communication system. The device comprising a memory and processing unit, wherein the memory includes an address location database for storing latitude and longitude data corresponding to respective addresses, and a zone database for storing zone data for the respective locations, and wherein processor includes a client registration processor for creating a client database in the memory upon the receipt of client information, and a database processor for searching the address location database for the latitude and longitude information corresponding to the client's address when the registration of a new client is requested by the client registration processor, for searching the zone database for zone data for a location corresponding to the latitude and longitude information, and for creating a home zone database in the memory by taking the zone data as the home zone data for the client. the current two-digit value. 4. The system of claim 1, wherein the application program is operable to communicate a second input date parameter to the converter corresponding to a second input date, the second input date parameter specifying a second two-digit input year value, the converter operable to infer a four-digit calendar year corresponding to the second input date parameter and to determine the number of periods between the input date and the second input date. 5. The system of claim 1, wherein the application program is operable to communicate a number parameter to the converter, the converter operable to adjust the output date in accordance with the number parameter to determine an adjusted output date. 6. The system of claim 1, wherein the converter is further operable to receive a future input date from the application program and to execute a window function to infer a four-digit calendar year of an output date corresponding to the future input date. 7. A computer-based system for inferring an output date expressed in a format having a four-digit calendar year from a historical input date expressed in a format having a two-digit calendar year, comprising: a converter; the converter operable to receive an input date parameter from an application program and to receive at least one function parameter of a plurality of function parameters from a shared parameter block, the input date parameter corresponding to the input date and specifying a two-digit input year value, the application program operable to determine conversion needs, the at least one function parameter operable to instruct the converter to execute a particular function according to conversion needs of the application program; the converter operable to receive a current system date from an operating system and to recognize a four-digit calendar year associated with the current system date, the first two digits of the four-digit calendar year having a current century value and the last two digits of the four-digit calendar year having a current two-digit value; the converter further operable to compare the input year value with the current two-digit value and, if the input year value is less than or equal to the current two-digit value, to infer the fist two digits of the four-digit calendar year of the output date to be the current century value; and the converter further operable to communicate the output date to the application program using the shared parameter block. 8. The converter of claim 7, wherein the converter is further operable to determine the second two digits of the four-digit calendar year of the output date to be the input year value and to communicate the four-digit calendar year of the output date to the application program. 9. The converter of claim 7, wherein the converter is operable to communicate at least the four-digit calendar year of the output date to the application program using the shared parameter block. 10. The converter of claim 7, wherein the converter is operable to infer the first two digits of the four-digit calendar year of the output date to be "19" if the input year value is not less than or equal to the current two-digit value. 11. The converter of claim 7, wherein the converter is operable to receive a second input date parameter from the application program corresponding to a second input date, the second input date parameter specifying a second two-digit input year value, the converter operable to infer a four digit calendar year corresponding to the second input date parameter and to determine the number of periods between the input date and the second input date. 12. The system of claim 7, wherein the converter is further operable to receive a number parameter from the application program and to adjust the output date according to the number parameter to determine an adjusted output date. 13. A computer-based method for inferring an output date expressed in a format having a four-digit calendar