I wanted to see if I can update TimeZoneDatabase (Olson tz data) for Pharo 2.0, but I am encountering a basic time conversion issue. I don't know the background on the Chronology changes in Pharo, so I'll just try to describe the issue as I understand it: I am in Michigan, so my time zone offset is 5 hours: DateAndTime now offset ==> -0:05:00:00 Pharo 2.0 does this (wrong): DateAndTime now - (DateAndTime fromSeconds: DateAndTime totalSeconds) ==> 0:05:00:00.334 Previously it did this (right): DateAndTime now - (DateAndTime fromSeconds: DateAndTime totalSeconds) ==> 0:00:00:00.444 Explanation: #totalSeconds reports seconds in local time, but #fromSeconds: in Pharo 2.0 is using UTC. One or the other of these must be wrong. Possible fix(?): Newer VMs have primitives that report UTC time. Use one of these instead of the local time primitive currently being used. Dave