java.time · java.base · since Java 1.8

ZoneId

declaration

public abstract class ZoneId implements Serializable

A time-zone identifier ("Europe/Belgrade") carrying the full IANA rule history — offsets, DST transitions, past reforms. Prefer region ids over fixed offsets.

Key methods

`static ZoneId of(String zoneId)`	"Europe/Belgrade", "America/New_York", "UTC".
`static ZoneId systemDefault()`	The JVM's zone — an input, never an assumption.