[Android General] palaych:
The center clock on the statusbar​

As I did in S6 Nougat:

Decompile SystemUI.apk

Go to res\layout\status_bar.xml

Before (original):

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.statusbar.phone.PhoneStatusBarView android:orientation="vertical" android:id="@id/status_bar" android:background="@drawable/system_bar_background" android:focusable="false" android:descendantFocusability="afterDescendants"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui">
<FrameLayout android:id="@id/background" android:layout_width="fill_parent" android:layout_height="fill_parent" />
<ImageView android:id="@id/notification_lights_out" android:paddingBottom="2.0dip" android:visibility="gone" android:layout_width="@dimen/status_bar_icon_size" android:layout_height="fill_parent" android:src="@drawable/ic_sysbar_lights_out_dot_small" android:scaleType="center" android:paddingStart="6.0dip" />
<LinearLayout android:orientation="horizontal" android:id="@id/status_bar_contents" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingStart="@dimen/status_bar_padding_start" android:paddingEnd="@dimen/status_bar_padding_end">
<com.android.systemui.statusbar.AlphaOptimizedFrameLayout android:orientation="horizontal" android:id="@id/notification_icon_area" android:layout_width="0.0dip" android:layout_height="fill_parent" android:layout_weight="1.0" />
<com.android.keyguard.AlphaOptimizedLinearLayout android:orientation="horizontal" android:id="@id/system_icon_area" android:layout_width="wrap_content" android:layout_height="fill_parent">
<TextView android:textSize="12.0dip" android:textColor="#ffffffff" android:gravity="center_vertical" android:id="@id/knoxCustomStatusBarText" android:visibility="gone" android:layout_width="wrap_content" android:layout_height="fill_parent" android:includeFontPadding="false" />
<include layout="@layout/system_icons" />
<com.android.systemui.statusbar.policy.Clock android:textAppearance="@style/TextAppearance.StatusBar.Clock" android:gravity="start|center" android:id="@id/clock" android:layout_width="wrap_content" android:layout_height="fill_parent" android:singleLine="true" android:paddingStart="@dimen/status_bar_clock_starting_padding" android:paddingEnd="@dimen/status_bar_clock_end_padding" />
</com.android.keyguard.AlphaOptimizedLinearLayout>
</LinearLayout>
</com.android.systemui.statusbar.phone.PhoneStatusBarView>

After editing:

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.statusbar.phone.PhoneStatusBarView android:orientation="vertical" android:id="@id/status_bar" android:background="@drawable/system_bar_background" android:focusable="false" android:descendantFocusability="afterDescendants"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui">
<FrameLayout android:id="@id/background" android:layout_width="fill_parent" android:layout_height="fill_parent" />
<ImageView android:id="@id/notification_lights_out" android:paddingBottom="2.0dip" android:visibility="gone" android:layout_width="@dimen/status_bar_icon_size" android:layout_height="fill_parent" android:src="@drawable/ic_sysbar_lights_out_dot_small" android:scaleType="center" android:paddingStart="6.0dip" />
<LinearLayout android:orientation="horizontal" android:id="@id/status_bar_contents" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingStart="@dimen/status_bar_padding_start" android:paddingEnd="@dimen/status_bar_padding_end">
[COLOR="Blue"]<LinearLayout android:orientation="horizontal" android:id="@id/system_icon_area" android:layout_width="fill_parent" android:layout_height="fill_parent">
<com.android.systemui.statusbar.AlphaOptimizedFrameLayout android:orientation="horizontal" android:id="@id/notification_icon_area" android:layout_width="0.0dip" android:layout_height="fill_parent" android:layout_weight="1.0" />
<com.android.systemui.statusbar.policy.Clock android:textAppearance="@style/TextAppearance.StatusBar.Clock" android:ellipsize="none" android:gravity="center" android:id="@id/clock" android:layout_width="wrap_content" android:layout_height="fill_parent" android:singleLine="true" />
<com.android.keyguard.AlphaOptimizedLinearLayout android:orientation="horizontal" android:layout_width="0.0dip" android:layout_height="fill_parent" android:layout_weight="1.0">
<Space android:layout_width="0.0dip" android:layout_height="fill_parent" android:layout_weight="1.0" />
<TextView android:textSize="12.0dip" android:textColor="#ffffffff" android:gravity="center_vertical" android:id="@id/knoxCustomStatusBarText" android:visibility="gone" android:layout_width="0.0dip" android:layout_height="0.0dip" android:includeFontPadding="false" />
<include layout="@layout/system_icons" />
<com.android.systemui.statusbar.policy.Clock android:textSize="0.0dip" android:layout_width="0.0dip" android:layout_height="0.0dip" />
</com.android.keyguard.AlphaOptimizedLinearLayout>
</LinearLayout>[/COLOR]
</LinearLayout>
</com.android.systemui.statusbar.phone.PhoneStatusBarView>