1970 UTC/GMT as their epoch time. The Javadoc documentation for both of Java’s standard “Date” classes (java.sql.Date and java.util.Date) talk about the significance of that date.

and working with classes in the Java 8 Date and Time API. Although the changes are few, they are significant because JPA 2.2 is the first version that takes Java 8 as a baseline. Josh Juneau ...

This works because the two are closely related. In Java, nested classes are categorized as either static member classes or inner classes. Inner classes are non-static member classes, local classes ...