iso8601 - Are ISO 8601 and unix timestamp formats 1:1? -

does every iso 8601 timestamp correspond 1 unix timestamp, , vice versa?

another way ask: let to_unix function converts iso 8601 timestamp unix timestamp, , to_iso function converts unix timestamp iso 8601 timestamp. there exist unix timestamp u such u != to_unix(to_iso(u)) or iso 8601 timestamp i such i != to_iso(to_unix(i))?

i ask because have unix timestamps in our database, , want use iso 8601 readability in api, , i'm wondering if ever problem.