Use date that fails with the fallback formatter

Fixes gh-9975

spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BinderTests.java

@@ -199,15 +199,15 @@ public class BinderTests {
 	@Test
 	public void bindWhenHasMalformedDateShouldThrowException() throws Exception {
 		this.thrown.expectCause(instanceOf(ConversionFailedException.class));
-		this.sources.add(new MockConfigurationPropertySource("foo", "2014-04-01"));
+		this.sources.add(new MockConfigurationPropertySource("foo", "2014-04-01T01:30:00.000-05:00"));
 		this.binder.bind("foo", Bindable.of(LocalDate.class));
 	}
 
 	@Test
 	public void bindWhenHasAnnotationsShouldChangeConvertedValue() throws Exception {
-		this.sources.add(new MockConfigurationPropertySource("foo", "2014-04-01"));
+		this.sources.add(new MockConfigurationPropertySource("foo", "2014-04-01T01:30:00.000-05:00"));
 		DateTimeFormat annotation = AnnotationUtils.synthesizeAnnotation(
-				Collections.singletonMap("iso", DateTimeFormat.ISO.DATE),
+				Collections.singletonMap("iso", DateTimeFormat.ISO.DATE_TIME),
 				DateTimeFormat.class, null);
 		LocalDate result = this.binder
 				.bind("foo", Bindable.of(LocalDate.class).withAnnotations(annotation))