export const calcDate = (date1, date2) => {
  let date3 = date2 - date1;

  let days = Math.floor(date3 / (24 * 3600 * 1000));

  let leave1 = date3 % (24 * 3600 * 1000); //计算天数后剩余的毫秒数
  let hours = Math.floor(leave1 / (3600 * 1000));

  let leave2 = leave1 % (3600 * 1000); //计算小时数后剩余的毫秒数
  let minutes = Math.floor(leave2 / (60 * 1000));

  let leave3 = leave2 % (60 * 1000); //计算分钟数后剩余的毫秒数
  let seconds = Math.round(date3 / 1000);
  return {
    leave1,
    leave2,
    leave3,
    days: days,
    hours: hours,
    minutes: minutes,
    seconds: seconds,
  };
};

/**
 * 日期格式化
 */
export function dateFormat(date, format) {
  format = format || 'yyyy-MM-dd hh:mm:ss';
  if (date !== 'Invalid Date') {
    let o = {
      'M+': date.getMonth() + 1, //month
      'd+': date.getDate(), //day
      'h+': date.getHours(), //hour
      'm+': date.getMinutes(), //minute
      's+': date.getSeconds(), //second
      'q+': Math.floor((date.getMonth() + 3) / 3), //quarter
      S: date.getMilliseconds(), //millisecond
    };
    if (/(y+)/.test(format))
      format = format.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
    for (let k in o)
      if (new RegExp('(' + k + ')').test(format))
        format = format.replace(
          RegExp.$1,
          RegExp.$1.length === 1 ? o[k] : ('00' + o[k]).substr(('' + o[k]).length)
        );
    return format;
  }
  return '';
}

/**
 * 当前时间戳
 */
export function dateNow() {
  return dateFormat(new Date(), 'yyyyMMddhhmmss');
}