EasyHH is a sub system of Microsoft Word and Microsoft Windows. It has no year 2000 or leap year problems itself and will be year 2000 compliant so long as the version of Word and Windows that you use with it is compliant.
You should therefore get assurance from Microsoft that the version of Word & Windows that you are using is Year 2000 compliant.
Year 2000 Assurance Software
Year 2000 problems take many forms and it would be useful if you had software to check where problem areas lie within your company. May we suggest that you download Quick Consultant from: http://www.theshops.co.uk/qc