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The main goals of date4j are:

• easy manipulation of dates/times in the Gregorian calendar.
• easy storage and retrieval of such dates/times from a relational database.
• a simplified model of civil timekeeping, similar to the model used by many databases.

You can now select a date and a time with only one widget!

A configurable and animated material loading button.

If you're an RxJava fan as I am this button will come you really handy.