const days = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

const date = new Date();
export function is_leapyear(year: number) {
  date.setFullYear(year, 1, 29);
  return date.getDate() === 29;
}

export function get_year(time: number) {
  return new Date(time).getFullYear();
}

export function set_year(time: number, year: number) {
  const dt = new Date(time);
  const dayOfMonth = dt.getDate();

  dt.setFullYear(year);

  if (dt.getDate() < dayOfMonth) {
    dt.setDate(0);
  }
  dt.setFullYear(year);
  return dt.getTime();
}

export function get_month(time: number) {
  return new Date(time).getMonth() + 1;
}

export function set_month(time: number, month: number) {
  const dt = new Date(time);
  const dayOfMonth = dt.getDate();
  dt.setMonth(month - 1);
  if (dt.getDate() < dayOfMonth) {
    dt.setDate(0);
  }
  return dt.getTime();
}

export function get_day_of_month(time: number) {
  return new Date(time).getDate();
}

export function set_day_of_month(time: number, day: number) {
  const dt = new Date(time);
  dt.setDate(day);
  return dt.getTime();
}

export function get_hours(time: number) {
  return new Date(time).getHours();
}

export function set_hours(time: number, hours: number) {
  const dt = new Date(time);
  dt.setHours(hours);
  return dt.getTime();
}

export function get_minutes(time: number) {
  return new Date(time).getMinutes();
}

export function set_minutes(time: number, minutes: number) {
  const dt = new Date(time)
  dt.setMinutes(minutes);
  return dt.getTime();
}

export function get_seconds(time: number) {
  return new Date(time).getSeconds();
}

export function set_seconds(time: number, seconds: number) {
  const dt = new Date(time);
  dt.setSeconds(seconds);
  return dt.getTime();
}

export function get_milliseconds(time: number) {
  return new Date(time).getMilliseconds();
}

export function set_milliseconds(time: number, milliseconds: number) {
  const dt = new Date(time);
  dt.setMilliseconds(milliseconds);
  return dt.getTime();
}

export function get_days_in_month(time: number) {
  const dt = new Date(time);
  const month = dt.getMonth() + 1;
  if (month === 2 && is_leapyear(dt.getFullYear())) {
    return 29;
  }
  return days[month];
}

export function parse(string: string) {
  return Date.parse(string);
}

export function now() {
  return Date.now();
}

export function get_day_of_week(time: number) {
  return new Date(time).getDay();
}

export function get_timezone_offset(time: number) {
  return new Date(time).getTimezoneOffset();
}

export function tm2str(time: number) {
  return new Date(time).toString();
}

export function tm2tmstr(time: number) {
  return new Date(time).toTimeString();
}

export function tm2local_str(time: number) {
  return new Date(time).toLocaleString();
}

export function tm2local_tmstr(time: number) {
  return new Date(time).toLocaleTimeString();
}

export function tm2isostr(time: number) {
  return new Date(time).toISOString();
}

export function tm2json(time: number, key?: any) {
  return new Date(time).toJSON(key);
}

export function valueof(time: number) {
  return new Date(time).valueOf();
}