The Date control allows you to select a date. The returned value is a string.
Example
new \Kirki\Field\Date(
[
'settings' => 'date_setting',
'label' => esc_html__( 'Date Control', 'kirki' ),
'description' => esc_html__( 'This is a date control.', 'kirki' ),
'section' => 'section_id',
'default' => '',
]
);Usage
<?php
$date = get_theme_mod( 'date_setting', '2019-01-30' );
echo esc_html( $date );
?>