export const fmtMs = (sec: number): string => {
  const m = Math.floor(sec / 60);
  const s = Math.floor(sec % 60);
  return `${m}:${s.toString().padStart(2, "0")}`;
};

export const fmtClock = (d: Date): string =>
  `${d.getHours().toString().padStart(2, "0")}:${d.getMinutes().toString().padStart(2, "0")}`;

export const fmtClockSec = (d: Date): string =>
  `${fmtClock(d)}:${d.getSeconds().toString().padStart(2, "0")}`;

export const fmtJpDate = (d: Date): string =>
  `${d.getFullYear()}年${d.getMonth() + 1}月${d.getDate()}日`;