public static msToTime (ms: number): string { const date = new Date(ms) const h = date.getHours() const m = date.getMinutes() const s = date.getSeconds() return `${h < 10 ? `0${h}` : h}:${m < 10 ? `0${m}` : m}:${s < 10 ? `0${s}` : s}` }