Datetime field not empty

Hi,

How to check if datetime field is not empty with rules.

My case is like this:
field: { view: “datepicker”, id: “received_on”, name: “received_on”, label: “Received On”, timepicker:true, invalidMessage: “This field cannot be empty”},

rules: {
received_on: webix.rules.isNotEmpty
}

But this rule is not working. Any idea?

Thank you

Above code works for me

http://webix.com/snippet/3cee4316

Thank you maksim