Date related functions

Date related functions

utils.js

@@ -0,0 +1,45 @@
+function calcAge(dateString) {
+	var birthday = +new Date(dateString);
+	return ~~((Date.now() - birthday) / (31557600000));
+}
+function monthDiff(d1) {
+	d1 = new Date(d1);
+	var d2 = new Date();
+	var months;
+	months = (d2.getFullYear() - d1.getFullYear()) * 12;
+	months -= d1.getMonth() + 1;
+	months += d2.getMonth();
+	return months <= 0 ? 0 : months;
+}
+function daysDiff(date1) {
+	var oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
+	var firstDate = new Date(date1);
+	var secondDate = new Date();
+
+	var diffDays = Math.round(Math.abs((firstDate.getTime() - secondDate.getTime()) / (oneDay)));
+	return diffDays;
+}
+function isValidDate(dt) {
+	if (Object.prototype.toString.call(d) === "[object Date]") {
+		// it is a date
+		if (isNaN(d.getTime())) {  // d.valueOf() could also work
+			// date is not valid
+		}
+		else {
+			// date is valid
+		}
+	}
+	else {
+		// not a date
+	}
+}
+
+function isDate(sDate) {
+	var scratch = new Date(sDate);
+	if (scratch.toString() == "NaN" || scratch.toString() == "Invalid Date") {
+		return false;
+	} else {
+		return true;
+
+	}
+}