How to change the default color of DatePicker and TimePicker dialog in Android?

Is there any way to change the default color of DatePicker and TimePicker dialog?

This is the code I tried

<DatePicker
                    style="@style/date_picker"
                    android:background="#6495ED"
                    android:id="@+id/DatePicker"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:layout_marginBottom="5dp"
                    android:layout_marginLeft="5dip"
                    android:layout_marginRight="5dip" />

<TimePicker
                    android:id="@+id/TimePicker"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:layout_marginBottom="5dp"
                    android:layout_marginLeft="5dip"
                    android:layout_marginRight="5dip" />

Below two line only changing the background color, I want to change the default silver color of both date and time picker.
Any help please.

style="@style/date_picker"
android:background="#6495ED"