date/time validation is not reliable

[vzverev78]

Due to used DateFormatter.parseDate() from https://github.com/kartik-v/php-date-formatter around line 1180 in jquery.datetimepicker.js
a validation is not reliable for the following cases:

1. date is invalid, but time is partially valid, e.g:
   '2016/04/33 10:13' -> '1899/12/31 10:13'
   '2016/04/33 1' -> '1899/12/31 1:00'
   '2016/04/33 99' -> '1899/12/31 00:00'
   this is because parseDate() ignores invalid date part if time part is present.
2. date is valid, but time is invalid, e.g:
   '2016/04/05 99:88' -> '2016/04/05 00:00'
   this is because parseDate() doesn't validate time part at all.

Tested with php-date-formatter 1.3.3.

[vzverev78]

If using alternative date formatter as recommended in docs: http://xdsoft.net/jqplugins/datetimepicker/#use_other_date_parser
the datetimepicker doesn't detect invalid date because moment() returns non-false object in case of invalid date.
Correct code is:

$.datetimepicker.setDateFormatter({
    parseDate: function (date, format) {
        var d = moment(date, format);
        return d.isValid() ? d.toDate() : false;
    },

    formatDate: function (date, format) {
        return moment(date).format(format);
    }
});

And don't forget to add 'format' into datetimepicker constructor.