Gets the unique time-zone ID. !(p) This ID uniquely defines this object. The format of an offset based ID is defined by {@link ZoneOffset#getId()}.
@return the time-zone unique ID, not null
See Implementation
Gets the unique time-zone ID. !(p) This ID uniquely defines this object. The format of an offset based ID is defined by {@link ZoneOffset#getId()}.
@return the time-zone unique ID, not null