diff --git a/src/Functions/toStartOfInterval.cpp b/src/Functions/toStartOfInterval.cpp
index b98d78171ae..e358addf972 100644
--- a/src/Functions/toStartOfInterval.cpp
+++ b/src/Functions/toStartOfInterval.cpp
@@ -192,8 +192,6 @@ public:
             case ResultType::DateTime64:
             {
                 UInt32 scale = 0;
-                if (isDateTime64(arguments[0].type))
-                    scale = assert_cast<const DataTypeDateTime64 &>(*arguments[0].type.get()).getScale();
                 if (interval_type->getKind() == IntervalKind::Kind::Nanosecond)
                     scale = (9 > scale) ? 9 : scale;
                 else if (interval_type->getKind() == IntervalKind::Kind::Microsecond)
diff --git a/tests/queries/0_stateless/02207_subseconds_intervals.reference b/tests/queries/0_stateless/02207_subseconds_intervals.reference
index 6cde773c3c4..7e6d64b6b9f 100644
--- a/tests/queries/0_stateless/02207_subseconds_intervals.reference
+++ b/tests/queries/0_stateless/02207_subseconds_intervals.reference
@@ -10,25 +10,25 @@ test intervals
 - test microseconds
 1980-12-12 12:12:12.123456
 1980-12-12 12:12:12.123400
-1980-12-12 12:12:12.12345700
-1980-12-12 12:12:12.12345700
+1980-12-12 12:12:12.123457
+1980-12-12 12:12:12.123457
 1930-12-12 12:12:12.123456
 1930-12-12 12:12:12.123400
-1930-12-12 12:12:12.12345600
+1930-12-12 12:12:12.123456
 2220-12-12 12:12:12.123456
 2220-12-12 12:12:12.123400
-2220-12-12 12:12:12.12345700
+2220-12-12 12:12:12.123457
 - test milliseconds
 1980-12-12 12:12:12.123
 1980-12-12 12:12:12.120
-1980-12-12 12:12:12.123000
-1980-12-12 12:12:12.123000
+1980-12-12 12:12:12.123
+1980-12-12 12:12:12.123
 1930-12-12 12:12:12.123
 1930-12-12 12:12:12.120
-1930-12-12 12:12:12.123000
+1930-12-12 12:12:12.123
 2220-12-12 12:12:12.123
 2220-12-12 12:12:12.120
-2220-12-12 12:12:12.123000
+2220-12-12 12:12:12.123
 test add[...]seconds()
 - test nanoseconds
 1980-12-12 12:12:12.123456790
diff --git a/tests/queries/0_stateless/02956_fix_to_start_of_milli_microsecond.reference b/tests/queries/0_stateless/02956_fix_to_start_of_milli_microsecond.reference
index 95a05a24981..413c79828c7 100644
--- a/tests/queries/0_stateless/02956_fix_to_start_of_milli_microsecond.reference
+++ b/tests/queries/0_stateless/02956_fix_to_start_of_milli_microsecond.reference
@@ -1,7 +1,7 @@
-2023-10-09 10:11:12.001000
-2023-10-09 10:11:12.001000
-2023-10-09 10:11:12.000000
-2023-10-09 10:11:12.000000
-2023-10-09 00:00:00.000000000
-2023-10-09 00:00:00.000000000
+2023-10-09 10:11:12.001
+2023-10-09 10:11:12.001
+2023-10-09 10:11:12.000
+2023-10-09 10:11:12.000
+2023-10-09 00:00:00.000000
+2023-10-09 00:00:00.000
 2023-10-09 00:00:00