Hi MohammadRadawan-7969,
Welcome to our Microsoft Q&A platform!
To modify the color of the data picker, you can try to modify the styles.xml as follows.
<style name="MainTheme" parent="MainTheme.Base">
<item name="android:datePickerDialogTheme">@style/CustomDatePickerDialog</item>
</style>
<style name="CustomDatePickerDialog" parent="ThemeOverlay.AppCompat.Dialog">
<!--header background-->
<item name="colorAccent">#009933</item>
<!--header textcolor-->
<item name="android:textColorPrimaryInverse">#ff9900</item>
<!--body background-->
<item name="android:windowBackground">#000099</item>
<!--selected day-->
<item name="android:colorControlActivated">#ff8000</item>
<!--days of the month-->
<item name="android:textColorPrimary">#ffff00</item>
<!--days of the week-->
<item name="android:textColorSecondary">#ff0066</item>
<!--cancel&ok-->
<item name="android:textColor">#00ffff</item>
</style>
Regards,
Kyle
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