datetime format validation.

datetimeFormatValidation.js

datetimeStart = "2018-01-01 00:00:00";
datetimeEnd = "2018-01-01 23:59:59";

function validation(datetimeStart, datetimeEnd) {
	if (!/^\d{4}-\d{2}-\d{2}\ \d{2}:\d{2}:\d{2}$/.test(datetimeStart)) {
		return false;
	} else if (!/^\d{4}-\d{2}-\d{2}\ \d{2}:\d{2}:\d{2}$/.test(datetimeEnd)) {
		return false;
	} else if (datetimeStart >= datetimeEnd) {  // 0埋めの場合、文字列のまま比較可能
		return false;
	} else {
		return true;
	}
}

validation(datetimeStart, datetimeEnd);