diff --git a/src/Functions/FunctionsConversion.h b/src/Functions/FunctionsConversion.h
index 74d8d853dcb..2e2a4ce9cfa 100644
--- a/src/Functions/FunctionsConversion.h
+++ b/src/Functions/FunctionsConversion.h
@@ -516,6 +516,25 @@ struct ToDateTime64TransformSigned
         return DecimalUtils::decimalFromComponentsWithMultiplier<DateTime64>(from, 0, scale_multiplier);
     }
 };
+template <typename FromDataType, typename FromType>
+struct ToDateTime64TransformFloat
+{
+    static constexpr auto name = "toDateTime64";
+
+    const UInt32 scale = 1;
+
+    ToDateTime64TransformFloat(UInt32 scale_ = 0)
+        : scale(scale_)
+    {}
+
+    inline NO_SANITIZE_UNDEFINED DateTime64::NativeType execute(FromType from, const DateLUTImpl &) const
+    {
+        if (from < 0)
+            return 0;
+        from = std::min<FromType>(from, FromType(0xFFFFFFFF));
+        return convertToDecimal<FromDataType, DataTypeDateTime64>(from, scale);
+    }
+};
 
 template <typename Name> struct ConvertImpl<DataTypeInt8, DataTypeDateTime64, Name>
     : DateTimeTransformImpl<DataTypeInt8, DataTypeDateTime64, ToDateTime64TransformSigned<Int8>> {};
@@ -528,9 +547,9 @@ template <typename Name> struct ConvertImpl<DataTypeInt64, DataTypeDateTime64, N
 template <typename Name> struct ConvertImpl<DataTypeUInt64, DataTypeDateTime64, Name>
     : DateTimeTransformImpl<DataTypeUInt64, DataTypeDateTime64, ToDateTime64TransformUnsigned<UInt64>> {};
 template <typename Name> struct ConvertImpl<DataTypeFloat32, DataTypeDateTime64, Name>
-    : DateTimeTransformImpl<DataTypeFloat32, DataTypeDateTime64, ToDateTime64TransformSigned<Float32>> {};
+    : DateTimeTransformImpl<DataTypeFloat32, DataTypeDateTime64, ToDateTime64TransformFloat<DataTypeFloat32, Float32>> {};
 template <typename Name> struct ConvertImpl<DataTypeFloat64, DataTypeDateTime64, Name>
-    : DateTimeTransformImpl<DataTypeFloat64, DataTypeDateTime64, ToDateTime64TransformSigned<Float64>> {};
+    : DateTimeTransformImpl<DataTypeFloat64, DataTypeDateTime64, ToDateTime64TransformFloat<DataTypeFloat64, Float64>> {};
 
 /** Conversion of DateTime64 to Date or DateTime: discards fractional part.
  */
diff --git a/tests/queries/0_stateless/01734_datetime64_from_float.reference b/tests/queries/0_stateless/01734_datetime64_from_float.reference
new file mode 100644
index 00000000000..32e7d2736c6
--- /dev/null
+++ b/tests/queries/0_stateless/01734_datetime64_from_float.reference
@@ -0,0 +1,7 @@
+-- { echo }
+SELECT CAST(1111111111.222 AS DateTime64(3));
+2005-03-18 04:58:31.222
+SELECT toDateTime(1111111111.222, 3);
+2005-03-18 04:58:31.222
+SELECT toDateTime64(1111111111.222, 3);
+2005-03-18 04:58:31.222
diff --git a/tests/queries/0_stateless/01734_datetime64_from_float.sql b/tests/queries/0_stateless/01734_datetime64_from_float.sql
new file mode 100644
index 00000000000..b6be65cb7c2
--- /dev/null
+++ b/tests/queries/0_stateless/01734_datetime64_from_float.sql
@@ -0,0 +1,4 @@
+-- { echo }
+SELECT CAST(1111111111.222 AS DateTime64(3));
+SELECT toDateTime(1111111111.222, 3);
+SELECT toDateTime64(1111111111.222, 3);