diff --git a/packages/@mantine/dates/src/components/DateTimePicker/DateTimePicker.tsx b/packages/@mantine/dates/src/components/DateTimePicker/DateTimePicker.tsx
index 06e016f385..59fece1f1f 100644
--- a/packages/@mantine/dates/src/components/DateTimePicker/DateTimePicker.tsx
+++ b/packages/@mantine/dates/src/components/DateTimePicker/DateTimePicker.tsx
@@ -168,6 +168,7 @@ export const DateTimePicker = factory<DateTimePickerFactory>((_props, ref) => {
       timeDate.setHours(hours);
       timeDate.setMinutes(minutes);
       timeDate.setSeconds(seconds || 0);
+      timeDate.setMilliseconds(0);
       setValue(assignTime(timeDate, _value || shiftTimezone('add', new Date(), ctx.getTimezone())));
     }
   };