Why does the datetimePicker format in jquery-weui show only the year or the day of the year?

referenced jquery-weui.min.js/jquery-weui.css;
my addition of the format attribute does not work

HTML part

<input type="text" id="datetime-picker"/>

JS part

$("-sharpdatetime-picker").datetimePicker({
    input: "-sharpdatetime-picker",
    container: "-sharpdatetime",
    min:"2000-1-1",
    max:"2030-1-1",
    format: "yyyy-mm-dd"
});

here"s what I"ve done. I want to get rid of
clipboard.png

.
Nov.17,2021

$("-sharpdatetime-picker").datetimePicker({
    times: function () {
        return [
        ];
    }
});

that's fine.

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