I'm writing a discord bot using discord.js and typescript, and I'm trying to embed a timestamp into the presence. I have a function that would set the presence:

function setPres(text: string, since?: number): void {
    client.user.setPresence({
        status: "online",
        activities: [{name: text}]
    });
}

But nowhere in the docs is a way to add a timestamp.

Thank you for your time!