var userId = your_user_id || null; // Replace your_user_id with your own if available.
window.hj('identify', userId, {
'Signed up': '2019—06-20Z', // Signup date in ISO-8601 format.
// Add your own custom attributes here. Some examples:
// 'Last purchase category': 'Electronics', // Send strings with quotes around them.
// 'Total purchases': 15, // Send numbers without quotes.
// 'Last purchase date': '2019-06-20Z', // Send dates in ISO-8601 format.
// 'Last refund date': null, // Send null when no value exists for a user.
});