Queried, but not modified, on a Java Runtime with incomplete time-zone information.Ĭlass use of identity-sensitive operations (including reference equality This approach is designed to allow a ZonedDateTime to be loaded and However, any call to getRules will fail with ZoneRulesException. HashCode, toString, getDisplayName and normalized. Object will exist, and can be queried using getId, equals, The client-side Java Runtime has not been updated. The ZoneOffset subclass uses a dedicated format that only stores theĪ ZoneId can be deserialized in a Java Runtime where the ID is unknown.įor example, if a server-side Java Runtime has been updated with a new zone ID, but This class can be serialized and stores the string zone ID in the external form. Thus if IATA data were defined, Utrecht airport would be 'IATA~UTC'. The recommended format for region IDs from groups other than TZDB is 'group~region'.
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However, the airport of Utrecht has the code 'UTC', which is obviously a conflict. Region IDs are typically the same as the three letter airport code. Groups other than TZDB to avoid conflicts. It is strongly recommended that the group name is included in all IDs supplied by
TZDB IDs take precedence over other groups. The TZDB group defines IDs such as 'Europe/London' or 'America/New_York'. Other organizations include IATA (the airline industry body) and Microsoft.Įach group defines its own format for the region ID it provides. The default group is the IANA Time Zone Database (TZDB). There are a number of organizations, known here as groups, that monitor Time-zone rules are defined by governments and change frequently. The configuration focuses on providing the lookup from the ID to the Region-based IDs are defined by configuration, see ZoneRulesProvider. Two or more characters, and not start with 'UTC', 'GMT', 'UT' '+' or '-'. The third type of ID are region-based IDs. These IDs can be normalized to a ZoneOffset using normalized(). The offset is the suffix and will be normalized during creation. The recognised prefixes are 'UTC', 'GMT' and 'UT'. The next type of ID are offset-style IDs with some form of prefix, This consists of 'Z' and IDs starting with '+' or '-'. The simplest type of ID is that from ZoneOffset. Similarly, a comparison of two IDs only examines the ID, whereasĪ comparison of two rules examines the entire data set. The ID, whereas serializing the rules sends the entire data set. This approach is taken because rules are defined by governments and change This class is simply an ID used to obtain the underlying rules. The actual rules, describing when and how the offset changes, are defined by ZoneRules. Most fixed offsets are represented by ZoneOffset.Ĭalling normalized() on any ZoneId will ensure that aįixed offset ID will be represented as a ZoneOffset.
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