The year 2000 problem may be present in programs and macros you've written. This would occur only if the software does any calculations involving dates, including use of the current date. You should review the code of all programs, macros, scripts, execs, and any other executable code for which you have the source. Look for usage of 2-digit years or the current date.
Some software have a built-in method for using a base year.
Other software do not have built-in processing of a base year. With such software, you have to explicitly write code which performs the processing described in the preceding paragraph.