--- a/lib/calendar_date_select.rb
+++ b/lib/calendar_date_select.rb
@@ -9,6 +9,11 @@ class CalendarDateSelect
       :time => " %I:%M %p",
       :javascript_include => "format_hyphen_ampm"
     },
+    :iso_date => {
+      :date => "%Y-%m-%d", 
+      :time => " %H:%M",
+      :javascript_include => "format_iso_date"
+    }, 
     :finnish => {
       :date => "%d.%m.%Y",
       :time => " %H:%M",

--- /dev/null
+++ b/public/javascripts/calendar_date_select/format_iso_date.js
@@ -0,0 +1,46 @@
+Date.prototype.toFormattedString = function(include_time) {
+	var hour;
+    var str = this.getFullYear() + "-" + Date.padded2(this.getMonth() + 1) + "-" +Date.padded2(this.getDate());
+    if (include_time) {
+        hour = this.getHours();
+        str += " " + this.getHours() + ":" + this.getPaddedMinutes();
+    }
+    return str;
+};
+
+Date.parseFormattedString = function (string) {
+
+    var regexp = "([0-9]{4})(-([0-9]{2})(-([0-9]{2})" + 
+        "( ([0-9]{1,2}):([0-9]{2})?" +
+        "?)?)?)?"; 
+
+    var d = string.match(new RegExp(regexp, "i"));
+    if (d === null) {
+        return Date.parse(string); // at least give javascript a crack at it.
+    }
+    var offset = 0; 
+    var date = new Date(d[1], 0, 1); 
+    if (d[3]) {
+        date.setMonth(d[3] - 1);
+    } 
+    if (d[5]) {
+        date.setDate(d[5]);
+    } 
+    if (d[7]) {
+        date.setHours(d[7]);
+    } 
+    if (d[8]) {
+        date.setMinutes(d[8]);
+    } 
+    if (d[0]) {
+        date.setSeconds(d[0]);
+    } 
+    if (d[2]) {
+        date.setMilliseconds(Number("0." + d[2]));
+    } 
+    if (d[4]) {
+        offset = (Number(d[6])) + Number(d[8]);
+        offset = ((d[5] == '-') ? 1 : -1); 
+    } 
+    return date; 
+};