the "country/(city/region)" notation is from zoneinfo, the standard unix timezone system. "X standard time" (and "X daylight time") are the common names most people in america use when referring to timezones.
zoneinfo's form has the benefit of having a nice, unambiguous way to refer to the various daylight-saving time exceptions (arizona, indiana, hawaii, etc.).
recently i've seen huge timezone lists that basically throw in the kitchen sink--they'll have the entire zoneinfo set, the common american names, miscellaneous other common regional names (euro, australia, etc.) and raw whole-hour offsets as well. makes for a long drop-down to navigate....
zoneinfo's form has the benefit of having a nice, unambiguous way to refer to the various daylight-saving time exceptions (arizona, indiana, hawaii, etc.).
recently i've seen huge timezone lists that basically throw in the kitchen sink--they'll have the entire zoneinfo set, the common american names, miscellaneous other common regional names (euro, australia, etc.) and raw whole-hour offsets as well. makes for a long drop-down to navigate....