Local and zone time data conversion processing for date-dependent information which spans one or two centuries

摘要

Date-dependent information in two digit format where the dates may occur in one or two centuries is provided for by time change interfaces (108) that convert date data in an external data file (114) from local time to zone time in zone input files (104) so that all dates occur in one century. Application programs (106) process the zone input files (104) using zone time instead of local time. After processing the zone time in the zone output files (113, 111) is processed by time change interfaces (110, 109) to yield output data in local time (112, 115). By this inventive method, necessary two digit date format programming changes to the application programs (106) due to the turn-of the century problem are minimized or eliminated.