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copied!<p>Use <a href="http://joda-time.sourceforge.net/" rel="noreferrer">Joda-Time</a>, period! :)</p> <p>Although "greater than 20 years" might be somewhat dependent on which kind of Calendar you're talking about, when you start counting, leap years, or daylight savings, Joda-Time will give you more flexibility that the util.Calendar class. Working with util.Date is not recommended and counting millisecond (or other things like that) will probably lead to buggy code.</p> <p><strong>JODA-TIME Code Samples:</strong></p> <p>Given:</p> <pre><code>int year1 = 2012, month1 = 2, day1 = 7; int year2 = 1987, month2 = 7, day2 = 23; //You can include a TimeZone if needed in the constructors below DateTime dateTime1 = new DateTime(year1, month1, day1, 0, 0); //2012-02-07T00:00:00.000-05:00 DateTime dateTime2 = new DateTime(year2, month2, day2, 0, 0); //1987-07-23T00:00:00.000-04:00 </code></pre> <p>Option 1, boring...</p> <pre><code>DateTime twentyYearsBefore = dateTime1.minusYears(20); //1992-02-07T00:00:00.000-05:00 if(dateTime2.compareTo(twentyYearsBefore) == -1) System.out.println("The difference between the dates is greater than 20 years"); </code></pre> <p>Option 2, good stuff!</p> <pre><code>Days d = Days.daysBetween(dateTime1, dateTime2); int days = d.getDays(); //-8965 days System.out.println("There are " + days + " days between the two dates"); </code></pre> <p>Option 3, rocket science!!! ;)</p> <pre><code>Period periodDifference = new Period(dateTime1, dateTime2); System.out.println(periodDifference); //prints: P-24Y-6M-2W-1D </code></pre> <p>Of course the <a href="http://joda-time.sourceforge.net/apidocs/org/joda/time/Period.html" rel="noreferrer">Period</a> class has a ton of methods to get only the relevant fields. Click the following for the APIs of <a href="http://joda-time.sourceforge.net/apidocs/org/joda/time/DateTime.html" rel="noreferrer">DateTime</a> and <a href="http://joda-time.sourceforge.net/apidocs/org/joda/time/Days.html" rel="noreferrer">Days</a></p>

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