/* test if browser supports date fields */
var testInput = document.createElement('input');
testInput.setAttribute('type', 'date');
if( testInput.type !== 'date') {

	/* add placeholder & pattern to all date fields */
	var dateFields = document.querySelectorAll('.mc4wp-form input[type="date"]');
	for(var i=0; i<dateFields.length; i++) {
		if(!dateFields[i].placeholder) {
			dateFields[i].placeholder = 'YYYY-MM-DD';
		}
		if(!dateFields[i].pattern) {
			dateFields[i].pattern = '^(?:19|20|21)\d\d[- \/.](?:0{0,1}[1-9]|1[012])[- \/.](?:0{0,1}[1-9]|[12][0-9]|3[01])$';
		}
	}
}