introduced java8-based date parsing

dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/common/ModelSupport.java

@@ -5,6 +5,9 @@ import static com.google.common.base.Preconditions.checkArgument;
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.TemporalAccessor;
 import java.util.Date;
 import java.util.Map;
 import java.util.Objects;
@@ -477,8 +480,6 @@ public class ModelSupport {
 		return ((OafEntity) t).getId();
 	}
 
-	public static final String ISO8601FORMAT = "yyyy-MM-dd'T'HH:mm:ssZ";
-
 	public static String oldest(String dateA, String dateB) throws ParseException {
 
 		if (StringUtils.isBlank(dateA)) {
@@ -489,8 +490,8 @@ public class ModelSupport {
 		}
 		if (StringUtils.isNotBlank(dateA) && StringUtils.isNotBlank(dateB)) {
 
-			final Date a = new SimpleDateFormat(ISO8601FORMAT).parse(dateA);
-			final Date b = new SimpleDateFormat(ISO8601FORMAT).parse(dateB);
+			final Date a = Date.from(Instant.from(DateTimeFormatter.ISO_INSTANT.parse(dateA)));
+			final Date b = Date.from(Instant.from(DateTimeFormatter.ISO_INSTANT.parse(dateB)));
 
 			return a.before(b) ? dateA : dateB;
 		} else {

dhp-schemas/src/test/java/eu/dnetlib/dhp/schema/oaf/MergeTest.java

@@ -85,6 +85,11 @@ public class MergeTest {
 		b = createRel(true, "2016-04-05T12:41:19.202Z");
 		a.mergeFrom(b);
 		assertEquals("2016-04-05T12:41:19.202Z", a.getValidationDate());
+
+		a = createRel(true, "2016-05-07T12:41:19.202Z");
+		b = createRel(true, "2016-04-05T12:41:19.202Z");
+		a.mergeFrom(b);
+		assertEquals("2016-04-05T12:41:19.202Z", a.getValidationDate());
 	}
 
 	@Test