Custom Date Matcher for JUnit4

IsDate.java

package sample;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import org.hamcrest.Matcher;

public class IsDate extends BaseMatcher<Date> {

	private final int yyyy;
	private final int mm;
	private final int dd;
	Object actual;

	IsDate(int yyyy, int mm, int dd) {
		this.yyyy = yyyy;
		this.mm = mm;
		this.dd = dd;
	}

	public static Matcher<Date> dateOf(int yyyy, int mm, int dd) {
		return new IsDate(yyyy, mm, dd);
	}

	@Override
	public boolean matches(Object actual) {
		this.actual = actual;
		if (!(actual instanceof Date)) {
			return false;
		}

		Calendar cal = Calendar.getInstance();
		cal.setTime((Date) actual);
		if (yyyy != cal.get(Calendar.YEAR) || 
                    mm != cal.get(Calendar.MONTH) + 1 || 
                    dd != cal.get(Calendar.DATE)) {
			return false;
		}

		return true;
	}

	@Override
	public void describeTo(Description desc) {
		desc.appendValue(this.yyyy + "/" + this.mm + "/" + this.dd);
		if (actual != null) {
			desc.appendText(" but actual is ");
			desc.appendValue(new SimpleDateFormat("yyyy/MM/dd").format((Date) actual));
		}
	}

}

Test.java

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static sample.IsDate.*;

public class Test {

    @Test
    public void sample() {
        assertThat(new Date(), is(dateOf(2012, 1, 12)));
    }
}