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copied!<p>Take a look at the Joda Time <a href="http://joda-time.sourceforge.net/xref/index.html" rel="nofollow">source code</a>. The <code>daysBetween</code> method of <a href="http://joda-time.sourceforge.net/xref/org/joda/time/Days.html" rel="nofollow">Days</a> is defined as:</p> <pre><code>public static Days daysBetween(ReadableInstant start, ReadableInstant end) { int amount = BaseSingleFieldPeriod.between(start, end, DurationFieldType.days()); return Days.days(amount); } </code></pre> <p><code>BaseSingleFieldPeriod</code>, like Days, is not available in Joda Time 1.2 but, looking at its <a href="http://joda-time.sourceforge.net/xref/org/joda/time/base/BaseSingleFieldPeriod.html" rel="nofollow">source</a> classes available in 1.2 start to appear:</p> <pre><code>protected static int between(ReadableInstant start, ReadableInstant end, DurationFieldType field) { if (start == null || end == null) { throw new IllegalArgumentException("ReadableInstant objects must not be null"); } Chronology chrono = DateTimeUtils.getInstantChronology(start); int amount = field.getField(chrono).getDifference(end.getMillis(), start.getMillis()); return amount; } </code></pre> <p>All of those classes and methods are available in Joda Time 1.2 so computing days between two instances would be something like:</p> <pre><code>public static int daysBetween(ReadableInstant oldDate, ReadableInstant today) { Chronology chrono = DateTimeUtils.getInstantChronology(oldDate); int amount = DurationFieldType.days().getField(chrono).getDifference(today.getMillis(), oldDate.getMillis()); return amount; } </code></pre>

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