JSFiddle - React, Tailwind, and code Playground

HTML

<input
    type="text"
    name="date"
    id="dateofbirth"
    placeholder="dd/mm/yyyy"
    onkeyup="
        var v = this.value;
        if (v.match(/^\d{2}$/) !== null) {
            this.value = v + '/';
        } else if (v.match(/^\d{2}\/\d{2}$/) !== null) {
            this.value = v + '/';
        }"
    maxlength="10"
>