How to add a new Input Field Type?

[nier3]

I tried all combinations of format date but only this works

Code:

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<input type="text" class="textbox"{NAME_PROP}{MAXLE​​N_PROP}{WIDTH_PROP_SIZE}{TABINDE​X​_PROP}{REQUIRED_PROP} value="<if {VALUE} && !$mybb->input['my_post_key'] then><?=my_date('Y/m/d',{VALUE})?><else>{VALUE}</if>" id="datepicker" /> <link type="text/css" rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css" /> <script src="//code.jquery.com/ui/1.11.2/jquery-ui.js"></script> <script src="/datepicker-it.js"></script> <script> $(function(){$('#datepicker').datepicker({dateFormat:'yy/mm/dd',autoSize:true});}); </script>

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Other format dates, when I do preview thread or submit thread, it says Invalid value. It works only with Y/m/d

But on showthread the format date is correct, that is dd-mm-yy because in Display Format I use <?=date('d-m-Y', {VALUE})?> so it's a problem only in newthread / edit post, but always better that string of before Not a big problem

And now if I don't add a date and I edit the thread it's perfect, I haven't more 1970-01-01 so it's awesome Thanks