export_date_options( string $post_type = ‘post’ )

Source

function export_date_options( $post_type = 'post' ) {
	global $wpdb, $wp_locale;

	$months = $wpdb->get_results(
		$wpdb->prepare(
			"SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
			FROM $wpdb->posts
			WHERE post_type = %s AND post_status != 'auto-draft'
			ORDER BY post_date DESC",
			$post_type
		)
	);

	$month_count = count( $months );
	if ( ! $month_count || ( 1 === $month_count && 0 === (int) $months[0]->month ) ) {
		return;
	}

	foreach ( $months as $date ) {
		if ( 0 === (int) $date->year ) {
			continue;
		}

		$month = zeroise( $date->month, 2 );

		printf(
			'<option value="%1$s">%2$s</option>',
			esc_attr( $date->year . '-' . $month ),
			$wp_locale->get_month( $month ) . ' ' . $date->year
		);
	}
}

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