Работа с датами

parsDate(date) - Получение Date из разных форматов: Date(не меняется), ‘YYYY-MM-DD’ Unix(10 и 13 символов).

formateDate(Date, 'DD.MM.YYYY') - Форматирования даты.

formateTime(Date, HH:mm:ss') - Форматирования времени.

daysInMonth(month, year) - Получить количество дней в месяце.

type InputDate = Date | string | number | null;

const created_at = new Date();

export function parsDate(date: InputDate) {
  if (!date) {
    return null;
  } else if (typeof date === "string") {
    return new Date(date);
  } else if (typeof date === "number") {
    return new Date(String(date).length === 10 ? date * 1000 : date);
  } else {
    return date;
  }
}

function checkDate(date: InputDate) {
  return date instanceof Date ? date : parsDate(date);
}

function getDateNoTime(date: InputDate) {
  const nDate = checkDate(date);
  return nDate
    ? new Date(nDate.getFullYear(), nDate.getMonth(), nDate.getDate())
    : null;
}

export function formateDate(date: InputDate, format: string = "DD.MM.YYYY") {
  const fDate = checkDate(date);
  if (!fDate) return "";
  return format
    .replace(/\bYYYY\b/, String(fDate.getFullYear()))
    .replace(/\bDD\b/, String(fDate.getDate()).padStart(2, "0"))
    .replace(/\bMM\b/, String(fDate.getMonth() + 1).padStart(2, "0"));
}

export function formateTime(date: InputDate, format: string = "HH:mm") {
  const fDate = checkDate(date);
  if (!fDate) return "";
  return format
    .replace(/\bHH\b/, String(fDate.getHours()).padStart(2, "0"))
    .replace(/\bmm\b/, String(fDate.getMinutes()).padStart(2, "0"))
    .replace(/\bss\b/, String(fDate.getSeconds()));
}

export function daysInMonth(month: number, year: number) {
  return new Date(year ?? created_at.getFullYear(), month, 0).getDate();
}

export function dateDiff(date1: InputDate, date2: InputDate, accountTime: Boolean = true) {
  const millisecondsPerDay = 1000 * 60 * 60 * 24;
  const fDate1 = checkDate(date1);
  const fDate2 = checkDate(date2);

  const millisBetween = accountTime
    ? Number(fDate2) - Number(fDate1)
    : Number(getDateNoTime(fDate2)) - Number(getDateNoTime(fDate1));

  return Math.round(millisBetween / millisecondsPerDay);
}

export default {
  parsDate,
  formateDate,
  formateTime,
  daysInMonth,
};

// return new Date(props.date).toLocaleDateString("ru-RU", {
//   timeZone: "Europe/Moscow",
// });