This is a time zone database for Smalltalk, integrated with Squeak Chronology. The time zone entries answer the number of seconds offset from UTC at any point in time in the range of the database rule set, as well as the number of leap seconds for a point in time (for tzfiles which contain the leap second rules). Durations, dates and times are all calculated with respect to a time zone entry in the database. A full time zone database requires access to tzfile data files, typically distributed with Unix (Linux) systems. A limited set of tzfile files is provided to initialize the database and demonstrate its functions.