There should be a new field of key info, time zone. Allong with a new client variable to accomodate it! Just be a value ranging from -12 to 13.
This a great example of it's use would be in postal games, so you can give the time a move was made in YOUR time zone.
var/postedTime = 840750 // 19:21:15
var/postedTimeZone = 5.75 // Kathmando =]
var/myTimeZone = -5 // Eastern
var/const/ticksPerHour = 36000
var/newTime = postedTime
newTime -= postedTimeZone * ticksPerHour
newTime += myTimeZone * ticksPerHour
world << "Posted at [time2text(newTime, "hh:mm:ss")]."