diff --git a/util/src/main/java/google/registry/util/DateTimeUtils.java b/util/src/main/java/google/registry/util/DateTimeUtils.java
index 0aa0fa617..362e8118e 100644
--- a/util/src/main/java/google/registry/util/DateTimeUtils.java
+++ b/util/src/main/java/google/registry/util/DateTimeUtils.java
@@ -19,6 +19,9 @@ import static com.google.common.base.Preconditions.checkArgument;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Ordering;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.TimeZone;
 import org.joda.time.DateTime;
 import org.joda.time.DateTimeZone;
 
@@ -86,4 +89,23 @@ public class DateTimeUtils {
     checkArgument(years >= 0);
     return years == 0 ? now : now.minusYears(1).minusYears(years - 1);
   }
+
+  /**
+   * Converts a Joda {@link DateTime} object to an equivalent java.time {@link ZonedDateTime}
+   * object.
+   */
+  public static ZonedDateTime toZonedDateTime(DateTime dateTime) {
+    java.time.Instant instant = java.time.Instant.ofEpochMilli(dateTime.getMillis());
+    return ZonedDateTime.ofInstant(instant, ZoneId.of(dateTime.getZone().getID()).normalized());
+  }
+
+  /**
+   * Converts a java.time {@link ZonedDateTime} object to an equivalent Joda {@link DateTime}
+   * object.
+   */
+  public static DateTime toJodaDateTime(ZonedDateTime zonedDateTime) {
+    return new DateTime(
+        zonedDateTime.toInstant().toEpochMilli(),
+        DateTimeZone.forTimeZone(TimeZone.getTimeZone(zonedDateTime.getZone())));
+  }
 }
diff --git a/util/src/test/java/google/registry/util/DateTimeUtilsTest.java b/util/src/test/java/google/registry/util/DateTimeUtilsTest.java
index f4e41da7d..481296a8d 100644
--- a/util/src/test/java/google/registry/util/DateTimeUtilsTest.java
+++ b/util/src/test/java/google/registry/util/DateTimeUtilsTest.java
@@ -24,8 +24,11 @@ import static google.registry.util.DateTimeUtils.isBeforeOrAt;
 import static google.registry.util.DateTimeUtils.latestOf;
 import static google.registry.util.DateTimeUtils.leapSafeAddYears;
 import static google.registry.util.DateTimeUtils.leapSafeSubtractYears;
+import static google.registry.util.DateTimeUtils.toJodaDateTime;
+import static google.registry.util.DateTimeUtils.toZonedDateTime;
 
 import com.google.common.collect.ImmutableList;
+import java.time.ZonedDateTime;
 import org.joda.time.DateTime;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -94,4 +97,46 @@ public class DateTimeUtilsTest {
   public void testFailure_latestOfEmpty() {
     assertThrows(IllegalArgumentException.class, () -> earliestOf(ImmutableList.of()));
   }
+
+  @Test
+  public void testSuccess_toZonedDateTime_preservesTimeZone() {
+    DateTime dateTime = DateTime.parse("2019-09-06T10:59:36.283-07:00"); // PDT
+    ZonedDateTime zonedDateTime = toZonedDateTime(dateTime);
+    assertThat(zonedDateTime.toString()).isEqualTo("2019-09-06T10:59:36.283-07:00"); // still PDT
+  }
+
+  @Test
+  public void testSuccess_toZonedDateTime_fromStringZulu() {
+    DateTime dateTime = DateTime.parse("2015-10-13T11:22:33.168Z");
+    ZonedDateTime zonedDateTime = toZonedDateTime(dateTime);
+    assertThat(zonedDateTime.toString()).isEqualTo("2015-10-13T11:22:33.168Z");
+  }
+
+  @Test
+  public void testSuccess_toZonedDateTime_leapYear() {
+    DateTime dateTime = DateTime.parse("2016-02-29T11:22:33.168Z");
+    ZonedDateTime zonedDateTime = toZonedDateTime(dateTime);
+    assertThat(zonedDateTime.toString()).isEqualTo("2016-02-29T11:22:33.168Z");
+  }
+
+  @Test
+  public void testSuccess_toJodaDateTime_preservesTimeZone() {
+    ZonedDateTime zonedDateTime = ZonedDateTime.parse("2019-09-06T10:59:36.283-07:00"); // PDT
+    DateTime dateTime = toJodaDateTime(zonedDateTime);
+    assertThat(dateTime.toString()).isEqualTo("2019-09-06T10:59:36.283-07:00"); // still PDT
+  }
+
+  @Test
+  public void testSuccess_toJodaDateTime_fromStringZulu() {
+    ZonedDateTime zonedDateTime = ZonedDateTime.parse("2015-10-13T11:22:33.168Z");
+    DateTime dateTime = toJodaDateTime(zonedDateTime);
+    assertThat(dateTime.toString()).isEqualTo("2015-10-13T11:22:33.168Z");
+  }
+
+  @Test
+  public void testSuccess_toJodaDateTime_leapYear() {
+    ZonedDateTime zonedDateTime = ZonedDateTime.parse("2016-02-29T11:22:33.168Z");
+    DateTime dateTime = toJodaDateTime(zonedDateTime);
+    assertThat(dateTime.toString()).isEqualTo("2016-02-29T11:22:33.168Z");
+  }
 }