Recompile with -Xlint:deprecation for details

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I need to know how to fix these error notes:

Note: Summer.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

Here is my code:

import java.util.Calendar;
import java.util.*;

class Summer
{
    public static void main(String[] args)
    {
        Date d1 = new Date();
        Date j21 = new Date(d1.getYear(), 6, 21);
        if(d1.before(j21)) {
            long diff = j21.getTime() - d1.getTime();
            diff = diff / (1000 * 60 * 60 * 24);
            System.out.println("There are " + diff + " days until June 21st" );
        }
        else {
            long diff = d1.getTime() - j21.getTime();
            diff = diff / (1000 * 60 * 60 * 24);
            diff = 365 - diff;
            System.out.println("There are " + diff + " days until June 21st" );
        }
    }
}

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