nicolaelvin on "[Plugin: Contact Form 7] Mac - Safari and Firefox"

I worked it out, its the input type of "date". This isn't supported in IE, FF or safari yet.

You need to first edit lines 55 - 62 in contact-form-7>includes>modules>date.php.

Instead of saying:

if ( wpcf7_support_html5() ) {
		$atts['type'] = $tag->basetype;
	} else {
		$atts['type'] = 'text';
	}

Comment everything out except the 4th line so it looks like :

//if ( wpcf7_support_html5() ) {
		//$atts['type'] = $tag->basetype;
	//} else {
		$atts['type'] = 'text';
	//}

Then install Contact Form 7 Datepicker