https://www.myintervent.com/Scripts/DateFormatter.js?v=98669

1function DateFormatter(id, format) {
2    var date = document.getElementById(id);
3
4    function checkValue(str, max) {
5        if (str.charAt(0) !== '0' || str == '00') {
6            var num = parseInt(str);
7            if (isNaN(num) || num <= 0 || num > max) num = 1;
8            str = num > parseInt(max.toString().charAt(0)) && num.toString().length == 1 ? '0' + num : num.toString();
9        };
10        return str;
11    };
12
13    date.addEventListener('input', function (e) {
14        this.type = 'text';
15        var input = this.value;
16        if (/\D\/$/.test(input)) input = input.substr(0, input.length - 3);
17        var values = input.split('/').map(function (v) {
18            return v.replace(/\D/g, '')
19        });
20        if (format == "DD/MM/YYYY") {
21            if (values[0]) values[0] = checkValue(values[0], 31);
22            if (values[1]) values[1] = checkValue(values[1], 12);
23        }
24        else {
25            if (values[0]) values[0] = checkValue(values[0], 12);
26            if (values[1]) values[1] = checkValue(values[1], 31);
27        }
28        var output = values.map(function (v, i) {
29            return v.length == 2 && i < 2 ? v + ' / ' : v;
30        });
31        this.value = output.join('').substr(0, 14);
32    });
33
34    date.addEventListener('blur', function (e) {
35        this.type = 'text';
36        var input = this.value;
37        var values = input.split('/').map(function (v, i) {
38            return v.replace(/\D/g, '')
39        });
40        var output = '';
41
42        if (values.length == 3) {
43            var year = values[2].length !== 4 ? parseInt(values[2]) + 2000 : parseInt(values[2]);
44            var month = "", day = "";
45            if (format == "DD/MM/YYYY") {
46                day = parseInt(values[0]);
47                month = parseInt(values[1]) - 1;
48            }
49            else {
50                month = parseInt(values[0]) - 1;
51                day = parseInt(values[1]);
52            }
53            var d = new Date(year, month, day);
54
55            if (!isNaN(d)) {
56                var dates = [d.getMonth() + 1, d.getDate(), d.getFullYear()];
57                output = moment(data.Record.Date).format(format);
58            };
59        };
60        this.value = output;
61
62        console.log(this.value);
63    });
64}
65
66function toSystemDateFormat(date, timeFormat) {
67    if (typeof timeFormat != "undefined") {
68        if (timeFormat == "12hour")
69            return moment(date, $("#userDateFormat").val() + 'hh:mm A').format('YYYY/MM/DD hh:mm A');
70        else
71            return moment(date, $("#userDateFormat").val() + 'HH:mm').format('YYYY/MM/DD HH:mm');
72    }
73    else
74        return moment(date, $("#userDateFormat").val()).format('YYYY/MM/DD');
75}
76
77function toLocalDateFormat(date, timeFormat) {
78    if (typeof timeFormat != "undefined") {
79        if (timeFormat == "12hour")
80            return moment(date).format($("#userDateFormat").val() + ' hh:mm A');
81        else
82            return moment(date).format($("#userDateFormat").val() + ' HH:mm');
83    }
84    else
85        return moment(date).format($("#userDateFormat").val());
86}