diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala
index f55b0545ee9c..cc2d6ac7ab2e 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala
@@ -36,7 +36,7 @@ object IntervalUtils {
   final val MICROS_PER_MINUTE: Long =
     DateTimeUtils.MILLIS_PER_MINUTE * DateTimeUtils.MICROS_PER_MILLIS
   final val DAYS_PER_MONTH: Byte = 30
-  final val MICROS_PER_MONTH: Long = DAYS_PER_MONTH * DateTimeUtils.SECONDS_PER_DAY
+  final val MICROS_PER_MONTH: Long = DAYS_PER_MONTH * DateTimeUtils.MICROS_PER_DAY
   /* 365.25 days per year assumes leap year every four years */
   final val MICROS_PER_YEAR: Long = (36525L * DateTimeUtils.MICROS_PER_DAY) / 100
 
diff --git a/sql/core/src/test/resources/sql-tests/results/date_part.sql.out b/sql/core/src/test/resources/sql-tests/results/date_part.sql.out
index 8f4edf196075..37de7159c2d5 100644
--- a/sql/core/src/test/resources/sql-tests/results/date_part.sql.out
+++ b/sql/core/src/test/resources/sql-tests/results/date_part.sql.out
@@ -857,7 +857,7 @@ select date_part('epoch', c) from t2
 -- !query 106 schema
 struct<date_part('epoch', t2.`c`):decimal(18,6)>
 -- !query 106 output
-31873892788.332003
+31897220765.004003
 
 
 -- !query 107