Period and Duration (The Java™ Tutorials > Date Time
A Duration measures an amount of time using time-based values (seconds, nanoseconds). A Period uses date-based values (years, months, days). Note: A Duration of one day is exactly 24 hours long. A Period of one day, when added to a ZonedDateTime, may vary according to the time zone. For example, if it occurs on the first or last day of daylight ...
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