| Class | Description | 
|---|---|
| ZoneOffsetTransition | A transition between two offsets caused by a discontinuity in the local time-line. | 
| ZoneOffsetTransitionRule | A rule expressing how to create a transition. | 
| ZoneRules | The rules defining how the zone offset varies for a single time-zone. | 
| ZoneRulesProvider | Provider of time-zone rules to the system. | 
| Enum | Description | 
|---|---|
| ZoneOffsetTransitionRule.TimeDefinition | A definition of the way a local time can be converted to the actual
 transition date-time. | 
| Exception | Description | 
|---|---|
| ZoneRulesException | Thrown to indicate a problem with time-zone configuration. | 
Support for time-zones and their rules.
Daylight Saving Time and Time-Zones are concepts used by Governments to alter local time. This package provides support for time-zones, their rules and the resulting gaps and overlaps in the local time-line typically caused by Daylight Saving Time.
 Unless otherwise noted, passing a null argument to a constructor or method in any class or interface
 in this package will cause a NullPointerException to be thrown.
 The Javadoc "@param" definition is used to summarise the null-behavior.
 The "@throws NullPointerException" is not explicitly documented in each method.
 
 All calculations should check for numeric overflow and throw either an ArithmeticException
 or a DateTimeException.
 
 Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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