It's not in ISO-8601. The suggestion above is to have the zone in the timestamp. ISO-8601 and RFC-3339 put the offset in the timestamp. Zone and offset are di

It's not in ISO-8601. The suggestion above is to have the zone in the timestamp. ISO-8601 and RFC-3339 put the offset in the timestamp. Zone and offset are different concepts: the up-thread comment's poster's example of Europe/London is one zone, that currently has two offsets, depending on time of year. The up-thread comment includes a very practical example that any app dealing with something like an "appointment" would have to reckon with.