$("#StartDate, #FinishDate", "form#Create").each(function() {
$(this).mask("9999-99-99 99:99:99");
});
but to note, ID's should be unique in the page, so having
<html>
<body>
<form id="Form1">
<input type="text" id="StartDate" />
<input type="text" id="EndDate" />
</form>
<form id="Create">
<input type="text" id="StartDate" />
<input type="text" id="EndDate" />
</form>
</body>
</html>
doesn't semantically make sense (and isn't 'valid HTML' to boot)
Why not just use a css class to denote which you want to "mask"?
