Relative functions for DateTimeType

bundles/org.openhab.core/src/main/java/org/openhab/core/library/types/DateTimeType.java

@@ -20,6 +20,7 @@
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 import java.time.format.DateTimeParseException;
+import java.time.temporal.ChronoUnit;
 import java.time.zone.ZoneRulesException;
 import java.util.Locale;
 
@@ -37,6 +38,7 @@
  * @author Wouter Born - increase parsing and formatting precision
  * @author Laurent Garnier - added methods toLocaleZone and toZone
  * @author Gaël L'hopital - added ability to use second and milliseconds unix time
+ * @author Gaël L'hopital - added isToday, isTomorrow, isYesterday, sameDay
  */
 @NonNullByDefault
 public class DateTimeType implements PrimitiveType, State, Command {
@@ -248,4 +250,25 @@ private ZonedDateTime parse(String value) throws DateTimeParseException {
 
         return date;
     }
+
+    public boolean isToday() {
+        return sameDay(ZonedDateTime.now());
+    }
+
+    public boolean isTomorrow() {
+        return sameDay(ZonedDateTime.now().plusDays(1));
+    }
+
+    public boolean isYesterday() {
+        return sameDay(ZonedDateTime.now().minusDays(1));
+    }
+
+    public boolean sameDay(DateTimeType other) {
+        return sameDay(other.zonedDateTime);
+    }
+
+    public boolean sameDay(ZonedDateTime other) {
+        return zonedDateTime.truncatedTo(ChronoUnit.DAYS)
+                .isEqual(other.withZoneSameLocal(zonedDateTime.getZone()).truncatedTo(ChronoUnit.DAYS));
+    }
 }

bundles/org.openhab.core/src/test/java/org/openhab/core/library/types/DateTimeTypeTest.java

@@ -43,6 +43,7 @@
  * @author Erdoan Hadzhiyusein - Added ZonedDateTime tests
  * @author Laurent Garnier - Enhanced tests
  * @author Gaël L'hopital - added ability to use second and milliseconds unix time
+ * @author Gaël L'hopital - added isToday, isTomorrow, isYesterday tests
  */
 @NonNullByDefault
 public class DateTimeTypeTest {
@@ -290,6 +291,21 @@ public void epochTest() {
         assertThat(epochStandard, is(zdtStandard));
     }
 
+    @Test
+    public void relativeTest() {
+        DateTimeType dt1 = new DateTimeType("2019-06-12T17:30:00Z");
+        DateTimeType dt2 = new DateTimeType("2019-06-12T00:00:00+0000");
+
+        assertTrue(dt1.sameDay(dt2));
+        assertTrue(new DateTimeType().isToday());
+
+        DateTimeType now = new DateTimeType();
+        DateTimeType tomorrow = new DateTimeType(now.getZonedDateTime().plusHours(24));
+        DateTimeType yesterday = new DateTimeType(now.getZonedDateTime().minusHours(24));
+        assertTrue(tomorrow.isTomorrow());
+        assertTrue(yesterday.isYesterday());
+    }
+
     @ParameterizedTest
     @MethodSource("parameters")
     public void createDate(ParameterSet parameterSet) {