LPS-47324 search portlet Search button disabled when selecting date range in IE8

Hi Vili,

It can be tested with IE11 in IE8 document mode.

The true fix would be fixing YUI, but that would be far more complicated.
Alloy fallbacks YUI, see here:
https://github.com/liferay/alloy-ui/blob/master/src/aui-datatype/js/aui-datatype-date-parse.js, line 832:
"**If only one argument is passed**, the YUI parser will be called for backwards compatibility."

Here in YUI:
https://github.com/yui/yui3/blob/master/src/date/js/date-parse.js
"var val = new Date(+data || data);"
So it is too simple to fix this IE8 issue.

Thanks in advance
Péter