packages/SystemUI/res/xml/qs_header.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2021 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  -->

<ConstraintSet
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/qs_header_constraint"
>

    <Constraint
        android:id="@+id/privacy_container">
        <Layout
            android:layout_width="wrap_content"
            android:layout_height="@dimen/large_screen_shade_header_min_height"
            app:layout_constraintEnd_toEndOf="@id/end_guide"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toTopOf="@id/carrier_group"
            app:layout_constraintHorizontal_bias="1"
            />
    </Constraint>

    <Constraint
        android:id="@+id/clock">
        <Layout
            android:layout_width="wrap_content"
            android:layout_height="@dimen/large_screen_shade_header_min_height"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/privacy_container"
            app:layout_constraintBottom_toBottomOf="@id/carrier_group"
        />
        <Transform
            android:scaleX="@dimen/qqs_expand_clock_scale"
            android:scaleY="@dimen/qqs_expand_clock_scale"
            />
    </Constraint>

    <Constraint
        android:id="@+id/date">
        <Layout
            android:layout_width="wrap_content"
            android:layout_height="@dimen/new_qs_header_non_clickable_element_height"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@id/carrier_group"
        />
    </Constraint>

    <!-- ShadeHeaderController helps with managing clock width to layout this view -->
    <Constraint
        android:id="@+id/carrier_group">
        <Layout
            android:layout_width="0dp"
            android:layout_height="@dimen/large_screen_shade_header_min_height"
            app:layout_constraintWidth_min="48dp"
            app:layout_constraintWidth_default="wrap"
            app:layout_constraintStart_toStartOf="@id/clock"
            app:layout_constraintTop_toBottomOf="@id/privacy_container"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toTopOf="@id/batteryRemainingIcon"
            />
        <PropertySet
            android:alpha="1"
            />
    </Constraint>

    <Constraint
        android:id="@+id/shade_header_system_icons">
        <Layout
            android:layout_width="0dp"
            android:layout_height="@dimen/new_qs_header_non_clickable_element_height"
            app:layout_constraintWidth_default="wrap"
            app:layout_constraintStart_toEndOf="@id/date"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="@id/date"
            app:layout_constraintBottom_toBottomOf="@id/date"
            />
    </Constraint>

</ConstraintSet>