Javascript/Node function to generate a random date set to UTC 00:00:00 timestamp

javascript_node_random_dob.js

// Create a native Javascript Date object set to UTC 00:00:00 timestamp
// Here, the default parameters create a plausible DOB

function randomDate( start = new Date(1935, 0, 1), end = new Date(2004, 0, 1) ) {
    var dt = new Date(+start + Math.random() * (end - start));
    dt.setUTCHours(0,0,0,0);
    return dt;
}

// Random DOB
db.people.insert({ "username" : "Pat", "dob" : randomDate() });

// Restricted dates, e.g., credit card dates: Jan 1 2020 - Dec 31 2028 (months are zero-offset, days are not)
db.people.insert({ "username": "baz", "dob": randomDate(new Date(2020, 0, 1), new Date(2028, 11, 31)) })