This tab in the Time Zone Database Tool lets you see how any selected time zone behaves.

For example, what is the current time? (note that a refresh is required for update)

Is this a “historical zone”? (meaning have time zone “rules” changed for this zone at some point?) Note that if “Yes”, there will be multiple “era” tabs in the lower definition area, each with the parameters for things like UTC offset, DST (daylight savings time) changeover, and so on—specific to that time era.