[Pharo-project] What can be negative regarding timezones with date-related objects?

Hi guys. Imagine in Fuel I am serializing date/time-related objects sending these messages: aDate julianDayNumber. aDateAndTime julianDayNumber. aDateAndTime nanoSecond. aDateAndTime secondsSinceMidnight. aDateAndTime offset asSeconds. aDateAndTime offset nanoSeconds. aDuration asSeconds. aDuration nanoSeconds. aTime asSeconds. aTime nanoeSecond. which of those things could answer negative numbers? because once I remember in my image everything was positive, but in other timezone I think "offset asSeconds" and "offset nanoSeconds" were negative in DateAndTime. thanks! -- Mariano http://marianopeck.wordpress.com