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Given a ZonedDateTime in the java.time package of Java 8 and later, how does one obtain an Instant?
Going the other way ( Instant → ZonedDateTime ) is simply:
ZonedDateTime zdt = ZonedDateTime.ofInstant( instant , zoneId ) ;
Going from ZonedDateTime → Instant is needed for things like converting to the old-school java.util.Date class.
java.util.Date date = Date.fromInstant( instant ) ;
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now() now() method of a ZonedDateTime class used to obtain the current date-time from the system clock in the default time-zone. This method will return ZonedDateTime based on system clock with default time-zone to obtain the current date-time.
now() now() method of a Instant class used to obtain the current instant from the system UTC clock. This method will return instant based on system UTC clock.
It doesn't have a time zone. It doesn't represent a date but an instance in time in milliseconds since the Unix epoch (1970).
Conversion Instant instant = Instant. now(); Now we will call the atZone() method on the instant object to convert it to a ZonedDateTime object. ZonedDateTime zonedDateTime = instant.
You can use the toInstant() default method from ChronoZonedDateTime interface (which is inherited by ZonedDateTime.
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