Patent ID: 8218942

Claim:
A reproduction apparatus for reproducing an optical disk recording medium recorded with N (N is an integer) pieces of data, data management information for managing each of the data, and total management information for managing the N pieces of data, wherein the total management information includes time zone information (TM_ZONE) indicating a time difference between a world standard time (Greenwich Mean Time) and a standard time in a predetermined location; wherein the data management information includes recording time zone information (REC_TM_ZONE) at a time of recording the data, indicating a time difference between the world standard time (Greenwich Mean Time) and a standard time at a location where the data has been recorded, and data recording time information (REC_TM) indicating a recording time when the data has been recorded, in accordance with the standard time indicated by the time zone information (TM_ZONE), wherein the reproduction apparatus includes means for reproducing the data, and specifying means for specifying a local recording time in a location where the data has been recorded; and wherein the specifying means calculates the local recording time in the location where the data has been recorded, by (REC_TM)−(TM_ZONE)+(REC_TM_ZONE) using the data recording time information (REC_TM), the time zone information (TM_ZONE) and the recording time zone information (REC TM_ZONE).