Added new validation type 'date' to validator module

lib/validator.js

@@ -83,6 +83,18 @@ function validate(body, fields, validation = {}) {
 					fieldsMap.get(checkOpts[1])
 				);
 				break;
+			case 'date': {
+				const raw = fieldsMap.get(checkOpts);
+				const obj = new Date(raw);
+
+				valid = !isNaN(obj.getTime());
+
+				fieldsMap.set(checkOpts, {
+					raw: raw,
+					date: obj
+				});
+				break;
+			}
 			default:
 				throw new Error('Invalid validation type');
 		}