After developing a China-wide dataset for the year 1820, the CHGIS project has been working on production of time-differentiated datasets, going backwards in time to the earliest available records wherever possible. The new temporal datasets are being produced region by region, starting with the southeast coastal area and moving north and northwest to the Central China plain. Currently we have finished draft versions of all administrative district changes for the areas overlapping modern Fujian, Zhejiang, Jiangsu, and parts of Anhui, Shandong and Hebei. This presentation will use ECAI TimeMap software to demonstrate browsing and searching of the time-differentiated datasets, and will introduce the CHGIS simplified spatio-temporal data model, and the methodology for temporal-coding of "fuzzy" date values.