What class to use for date manipulation

To get some experience in using Java, I would like to write a small application. I want users to enter their names and birth dates, and then I want to present the number of days they have been walking around on this planet. Furthermore, I want to present the dates when the number of days will be a nice quantity ("On February 1st, 2007 your day age will be 10.000 days", or something like that).
To calculate the number of days, I have to do some date manipulation. Now I am wondering what date-related classes I should use. Of course, there is Date, but in the API specification, I see 'deprecated' for a lot of methods. Does this mean that the use of Date is discouraged, and/or should be avoided?
Then, there is a class Calendar, but that's an abstract class. Thus, I cannot create a Calendar object when a user has entered his birth date (in a Swing JTextField).
The use of GregorianCalendar seems a bit far-fetched to me, but maybe I am wrong.
In short, when a user has entered his birth date, I want to store it in some date-like object, and I want to be able to do some arithmetic based on that object.
Can anyone give me some clues?
Ewout

> The use of GregorianCalendar seems a bit far-fetched
to me, but maybe I am wrong.
Yes, that's the way to go.

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