khanhtran3005 · December 15, 2017 09:39 · Dec 15, 2017
diff --git a/dateValidation.js b/dateValidation.js
@@ -0,0 +1,40 @@
+function Validator() {}
+
+Validator.min = function(number, min) {
+    return number >= min;
+}
+
+Validator.max = function(number, max) {
+    return number <= max;
+}
+
+Validator.between = function(number, min, max) {
+    return Validator.min(number, min) && Validator.max(number, max)
+}
+
+/**
+ * dd/mm/yyyy validation
+ * @param  {string} date
+ * @return {boolean}
+ */
+Validator.date = function(date) {
+    var regex = /^(0?[1-9]|[12][0-9]|3[01])[\/\-](0?[1-9]|1[012])[\/\-]\d{4}$/;
+    if (!regex.test(date)) return false;
+
+    var pdate = date.split('/');
+    if (pdate.length < 3) pdate = date.split('-'); // if separator is not '/'
+    if (pdate < 3) return false; // check if array length < 3
+
+    var d = parseInt(pdate[0]);
+    var m = parseInt(pdate[1]);
+    var y = parseInt(pdate[2]);
+    var daysInMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
+
+    if (!Validator.between(m, 1, 12)) return false;
+
+    if ((!(y % 4) && y % 100) || !(y % 400)) {
+        daysInMonth[1] = 29; // leap year
+    }
+
+    return d <= daysInMonth[--m];
+}