@Test
public void testWithPeriodStart() {

	DateTime testDate = new DateTime(2009, 5, 1, 0, 0, 0, 0);//Friday, May 1st
	DateTime adjustedDate = ExtendedChronology.withPeriodStart(testDate);
	assertEquals("2009-04-01T00:00:00.000", noZone(adjustedDate.toString()));
	
	testDate = new DateTime(2009, 3, 27, 0, 0, 0, 0);//Friday, May 1st
	adjustedDate = ExtendedChronology.withPeriodStart(testDate);
	assertEquals("2009-01-01T00:00:00.000", noZone(adjustedDate.toString()));
}