マネーフォワード経費(MF経費) で経費一覧で抜けている日付を一覧表示するBookmarklet

mf_cloud_keihi_missing_checker.js

javascript:{
  const datesOfMonth = date => {
    const firstDate = firstOfMonth(date);
    const until = nextFirstOfMonth(date);
    const result = [];
    for (let date = new Date(firstDate); +date < +until; date.addDays(1))
      result.push(new Date(date));
    return result;
  };
  const firstOfMonth = d=>{
    const firstDate = new Date(d);
    firstDate.setDate(1);
    return firstDate;
  };
  const nextFirstOfMonth = d=>{
    const nxt = firstOfMonth(d);
    nxt.addMonths(1);
    return nxt;
  };
  const isWeekday = d=>{
    const day = d.getDay();
    return day >= 1 && day <= 5;
  };
  const format = d=>{
    const y = d.getFullYear();
    const m = d.getMonth() + 1;
    const dm = ("" + d.getDate()).padStart(2, "0");
    const wd = "日月火水木金土"[d.getDay()];
    return `${y}/${m}/${dm}(${wd})`;
  };
  const parse = s => new Date(s);
  const dateElems = [...document.querySelectorAll('#ex-main-container > div.ex-container > div.ex-form-container > table > tbody > tr > td.js-transaction-recognized_at_td')];
  const dates = [...dateElems.reduce((set,curr)=>set.add(curr.textContent), new Set())].sort();
  const required = new Set(datesOfMonth(parse(dates[0])).filter(isWeekday).map(format));
  const missing = new Set(required);
  for (const date of dates) {
    missing.delete(date);
  }
  alert([...missing].join('\n'));
}