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dart - How to customize a date picker

I’m using the showDatePicker() method to display a date picker in my flutter application. How do I customize the colors of the date picker?

Here is my theme's code:

class CustomTheme extends Theme {
  /*
   * Colors:
   *    Primary Blue: #335C81 (51, 92, 129)
   *    Light Blue:   #74B3CE (116, 179, 206)
   *    Yellow:       #FCA311 (252, 163, 17)
   *    Red:          #E15554 (255, 85, 84)
   *    Green:        #3BB273 (59, 178, 115)
   */

  static int _fullAlpha = 255;
  static Color blueDark =  new Color.fromARGB(_fullAlpha, 51, 92, 129);
  static Color blueLight = new Color.fromARGB(_fullAlpha, 116, 179, 206);
  static Color yellow =    new Color.fromARGB(_fullAlpha, 252, 163, 17);
  static Color red =       new Color.fromARGB(_fullAlpha, 255, 85, 84);
  static Color green =     new Color.fromARGB(_fullAlpha, 59, 178, 115);

  static Color activeIconColor = yellow;


  CustomTheme(Widget child): super(
    child: child,
    data: new ThemeData(
      primaryColor: blueDark,
      accentColor: yellow,
      cardColor: blueLight,
      backgroundColor: blueDark,
      highlightColor: red,
      splashColor: green
    )
  );
}

Here is my code for wrapping the page in the theme:

  @override
  Widget build(BuildContext context) {
    [...]
    return new CustomTheme(
      new Scaffold(
        [...]
      )
    );
  }
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The above answers are working except for the Ok/Cancel buttons. Just adding this in case somebody needs help on customizing it. It is a combination of colorScheme and buttonTheme.

showTimePicker(
  context: context,
  initialTime: TimeOfDay(hour: hour, minute: minute),
  builder: (BuildContext context, Widget child) {
    return Theme(
      data: ThemeData.light().copyWith(
          primaryColor: const Color(0xFF8CE7F1),
          accentColor: const Color(0xFF8CE7F1),
          colorScheme: ColorScheme.light(primary: const Color(0xFF8CE7F1)),
          buttonTheme: ButtonThemeData(
            textTheme: ButtonTextTheme.primary
          ),
      ),
      child: child,
    );
  },
);

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