JS - Waiting for a specific datetime

index.mjs

async function waitUntilDatetime(timestamp, maxWait = 86400000) {
    let beginAt = Date.now()
    // Something scheduled should wait less than 24 hours, or 86400000 ms.
    // After that point, it'll take too damn long, even for a daemon, so it should be refused.

    if((timestamp - beginAt) > maxWait) // Refuse
        throw new Error(`Requested to wait for ${timestamp - beginAt} ms., which exceeds the limit of ${maxWait} ms.`)

    while(Date.now() < timestamp)
        await sleep(Math.min(timestamp - Date.now(), 10000))

    return (Date.now()-beginAt)
}