weekofyear(time) {
        let date = new Date(time || se.t)
        date.setUTCHours(0, 0, 0, 0)
        date.setDate(date.getUTCDate() + 3 - (date.getUTCDay() + 6) % 7)
        let week1 = new Date(date.getUTCFullYear(), 0, 4)
        return 1 + Math.round(
            ((date - week1) / 86400000 - 3 +
            (week1.getUTCDay() + 6) % 7) / 7
        )
    }
Week of year, literally
@param {number} [time] - Time in ms (current t, if not defined)
@return {number} - Week