This JSR must handle different date and time aspects, such as timestamps, time durations or time periods. It was agreed that JSR 310 basically would be the way to go. Nevertheless, it would be useful to have a solution that is more compatible with JDK releases prior to SE 8. It was decided to
use solve this as follows:
- usage of java.lang.Long for modelling UTC timestamps, where as the value denotes the ms starting from 1.1.1970 00:00.
- when a value is not define null may be returned.