Support iso-offset for date-time and time formatting with MVC

See gh-21630

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/format/DateTimeFormatters.java

@@ -25,6 +25,7 @@ import org.springframework.util.StringUtils;
  * {@link DateTimeFormatter Formatters} for dates, times, and date-times.
  *
  * @author Andy Wilkinson
+ * @author Gaurav Pareek
  * @since 2.3.0
  */
 public class DateTimeFormatters {
@@ -60,7 +61,8 @@ public class DateTimeFormatters {
 	 * @return {@code this} for chained method invocation
 	 */
 	public DateTimeFormatters timeFormat(String pattern) {
-		this.timeFormatter = isIso(pattern) ? DateTimeFormatter.ISO_LOCAL_TIME : formatter(pattern);
+		this.timeFormatter = isIso(pattern) ? DateTimeFormatter.ISO_LOCAL_TIME
+				: (isIsoOffset(pattern) ? DateTimeFormatter.ISO_OFFSET_TIME : formatter(pattern));
 		return this;
 	}
 
@@ -70,7 +72,8 @@ public class DateTimeFormatters {
 	 * @return {@code this} for chained method invocation
 	 */
 	public DateTimeFormatters dateTimeFormat(String pattern) {
-		this.dateTimeFormatter = isIso(pattern) ? DateTimeFormatter.ISO_LOCAL_DATE_TIME : formatter(pattern);
+		this.dateTimeFormatter = isIso(pattern) ? DateTimeFormatter.ISO_LOCAL_DATE_TIME
+				: (isIsoOffset(pattern) ? DateTimeFormatter.ISO_OFFSET_DATE_TIME : formatter(pattern));
 		return this;
 	}
 
@@ -103,4 +106,8 @@ public class DateTimeFormatters {
 		return "iso".equalsIgnoreCase(pattern);
 	}
 
+	private static boolean isIsoOffset(String pattern) {
+		return "isooffset".equalsIgnoreCase(pattern);
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -1964,6 +1964,10 @@
         {
           "value": "iso",
           "description": "ISO-8601 extended local date-time format."
+        },
+        {
+          "value": "isooffset",
+          "description": "ISO Offset local date-time format."
         }
       ],
       "providers": [
@@ -1982,6 +1986,10 @@
         {
           "value": "iso",
           "description": "ISO-8601 extended local time format"
+        },
+        {
+          "value": "isooffset",
+          "description": "ISO Offset local time format."
         }
       ],
       "providers": [

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/format/WebConversionServiceTests.java

@@ -19,7 +19,10 @@ package org.springframework.boot.autoconfigure.web.format;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.LocalTime;
+import java.time.OffsetDateTime;
+import java.time.OffsetTime;
 import java.time.ZoneId;
+import java.time.ZoneOffset;
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 import java.time.format.FormatStyle;
@@ -35,6 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Brian Clozel
  * @author Madhura Bhave
+ * @author Gaurav Pareek
  */
 class WebConversionServiceTests {
 
@@ -76,10 +80,19 @@ class WebConversionServiceTests {
 	void isoTimeFormat() {
 		WebConversionService conversionService = new WebConversionService(new DateTimeFormatters().timeFormat("iso"));
 		LocalTime time = LocalTime.of(12, 45, 23);
+		System.out.println(conversionService.convert(time, String.class));
 		assertThat(conversionService.convert(time, String.class))
 				.isEqualTo(DateTimeFormatter.ISO_LOCAL_TIME.format(time));
 	}
 	
+	@Test
+	void isoOffsetTimeFormat() {
+		WebConversionService conversionService = new WebConversionService(new DateTimeFormatters().timeFormat("isooffset"));
+		OffsetTime offsetTime =OffsetTime.of(LocalTime.of(12, 45, 23), ZoneOffset.ofHoursMinutes(1, 30)); 
+		assertThat(conversionService.convert(offsetTime, String.class))
+				.isEqualTo(DateTimeFormatter.ISO_OFFSET_TIME.format(offsetTime));
+	}
+
 	@Test
 	void customTimeFormat() {
 		WebConversionService conversionService = new WebConversionService(
@@ -105,6 +118,15 @@ class WebConversionServiceTests {
 				.isEqualTo(DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(dateTime));
 	}
 
+	@Test
+	void isoOffsetDateTimeFormat() {
+		WebConversionService conversionService = new WebConversionService(
+				new DateTimeFormatters().dateTimeFormat("isooffset"));
+		OffsetDateTime offsetdate =OffsetDateTime.of(LocalDate.of(2020, 4, 26), LocalTime.of(12, 45, 23), ZoneOffset.ofHoursMinutes(1, 30)); 
+		assertThat(conversionService.convert(offsetdate, String.class))
+				.isEqualTo(DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(offsetdate));
+	}
+	
 	@Test
 	void customDateTimeFormat() {
 		WebConversionService conversionService = new WebConversionService(