diff --git a/core/src/main/java/org/apache/calcite/avatica/util/TimeUnit.java b/core/src/main/java/org/apache/calcite/avatica/util/TimeUnit.java
index b81d707f00..cfbe46c713 100644
--- a/core/src/main/java/org/apache/calcite/avatica/util/TimeUnit.java
+++ b/core/src/main/java/org/apache/calcite/avatica/util/TimeUnit.java
@@ -25,7 +25,7 @@
  * {@link #HOUR}, {@link #MINUTE}, {@link #SECOND} can be the unit of a SQL
  * interval.
  *
- * <p>The others ({@link #QUARTER}, {@link #WEEK}, {@link #MILLISECOND},
+ * <p>The others ({@link #QUARTER}, {@link #WEEK}, {@link #ISOWEEK}, {@link #MILLISECOND},
  * {@link #DOW}, {@link #DOY}, {@link #EPOCH}, {@link #DECADE}, {@link #CENTURY},
  * {@link #MILLENNIUM}, {@link #MICROSECOND}, {@link #NANOSECOND}, {@link #ISODOW}
  * and {@link #ISOYEAR}) are convenient to use internally,
@@ -48,6 +48,8 @@ public enum TimeUnit {
   ISOYEAR(true, ' ', BigDecimal.valueOf(12) /* months */, null),
   WEEK(false, '*', BigDecimal.valueOf(DateTimeUtils.MILLIS_PER_DAY * 7),
       BigDecimal.valueOf(53)),
+  ISOWEEK(false, '*', BigDecimal.valueOf(DateTimeUtils.MILLIS_PER_DAY * 7),
+      BigDecimal.valueOf(53)),
   MILLISECOND(false, '.', BigDecimal.ONE, BigDecimal.valueOf(1000)),
   MICROSECOND(false, '.', BigDecimal.ONE.scaleByPowerOfTen(-3),
       BigDecimal.valueOf(1000_000)),
diff --git a/core/src/main/java/org/apache/calcite/avatica/util/TimeUnitRange.java b/core/src/main/java/org/apache/calcite/avatica/util/TimeUnitRange.java
index 8710692258..eabe6a604a 100644
--- a/core/src/main/java/org/apache/calcite/avatica/util/TimeUnitRange.java
+++ b/core/src/main/java/org/apache/calcite/avatica/util/TimeUnitRange.java
@@ -42,6 +42,7 @@ public enum TimeUnitRange {
   ISOYEAR(TimeUnit.ISOYEAR, null),
   QUARTER(TimeUnit.QUARTER, null),
   WEEK(TimeUnit.WEEK, null),
+  ISOWEEK(TimeUnit.ISOWEEK, null),
   MILLISECOND(TimeUnit.MILLISECOND, null),
   MICROSECOND(TimeUnit.MICROSECOND, null),
   NANOSECOND(TimeUnit.NANOSECOND, null),