diff --git a/src/Functions/FunctionDateOrDateTimeToSomething.h b/src/Functions/FunctionDateOrDateTimeToSomething.h
index 5269eecea37..d734c7f87c1 100644
--- a/src/Functions/FunctionDateOrDateTimeToSomething.h
+++ b/src/Functions/FunctionDateOrDateTimeToSomething.h
@@ -148,8 +148,10 @@ public:
         const IFunction::Monotonicity is_monotonic = { .is_monotonic = true };
         const IFunction::Monotonicity is_not_monotonic;
 
-        /// This method is called only if the function has one argument. Therefore, we do not care about the non-local time zone.
-        const DateLUTImpl & date_lut = DateLUT::instance();
+        const DateLUTImpl * date_lut = &DateLUT::instance();
+        if (const auto * timezone = dynamic_cast<const TimezoneMixin *>(&type))
+            date_lut = &timezone->getTimeZone();
+
         if (left.isNull() || right.isNull())
             return is_not_monotonic;
 
@@ -157,20 +159,20 @@ public:
 
         if (checkAndGetDataType<DataTypeDate>(&type))
         {
-            return Transform::FactorTransform::execute(UInt16(left.get<UInt64>()), date_lut)
-                == Transform::FactorTransform::execute(UInt16(right.get<UInt64>()), date_lut)
+            return Transform::FactorTransform::execute(UInt16(left.get<UInt64>()), *date_lut)
+                == Transform::FactorTransform::execute(UInt16(right.get<UInt64>()), *date_lut)
                 ? is_monotonic : is_not_monotonic;
         }
         else if (checkAndGetDataType<DataTypeDate32>(&type))
         {
-            return Transform::FactorTransform::execute(Int32(left.get<UInt64>()), date_lut)
-                   == Transform::FactorTransform::execute(Int32(right.get<UInt64>()), date_lut)
+            return Transform::FactorTransform::execute(Int32(left.get<UInt64>()), *date_lut)
+                   == Transform::FactorTransform::execute(Int32(right.get<UInt64>()), *date_lut)
                    ? is_monotonic : is_not_monotonic;
         }
         else
         {
-            return Transform::FactorTransform::execute(UInt32(left.get<UInt64>()), date_lut)
-                == Transform::FactorTransform::execute(UInt32(right.get<UInt64>()), date_lut)
+            return Transform::FactorTransform::execute(UInt32(left.get<UInt64>()), *date_lut)
+                == Transform::FactorTransform::execute(UInt32(right.get<UInt64>()), *date_lut)
                 ? is_monotonic : is_not_monotonic;
         }
     }
diff --git a/tests/queries/0_stateless/02346_to_hour_monotonicity_fix.reference b/tests/queries/0_stateless/02346_to_hour_monotonicity_fix.reference
new file mode 100644
index 00000000000..5d49984b71b
--- /dev/null
+++ b/tests/queries/0_stateless/02346_to_hour_monotonicity_fix.reference
@@ -0,0 +1 @@
+5	8	42
diff --git a/tests/queries/0_stateless/02346_to_hour_monotonicity_fix.sql b/tests/queries/0_stateless/02346_to_hour_monotonicity_fix.sql
new file mode 100644
index 00000000000..5eb396970d7
--- /dev/null
+++ b/tests/queries/0_stateless/02346_to_hour_monotonicity_fix.sql
@@ -0,0 +1,8 @@
+drop table if exists test_tz_hour;
+
+create table test_tz_hour(t DateTime, x String) engine MergeTree partition by toYYYYMMDD(t) order by x;
+insert into test_tz_hour select toDateTime('2021-06-01 00:00:00', 'UTC') + number * 600, 'x' from numbers(1e3);
+
+select toHour(toTimeZone(t, 'UTC')) as toHour_UTC, toHour(toTimeZone(t, 'Asia/Jerusalem')) as toHour_Israel, count() from test_tz_hour where toHour_Israel = 8 group by toHour_UTC, toHour_Israel;
+
+drop table test_tz_hour;