日時表記

from_now.js

import moment from 'moment';

function fromNow (unixTime) {
  if (!unixTime) {
    return '';
  }
  let target = moment.unix(unixTime);
  const diffMinutes = moment().diff(target, 'minutes');
  const diffHours = moment().diff(target, 'hours');
  const diffDays = moment().diff(target, 'days');
  const diffWeeks = moment().diff(target, 'weeks');
  const diffMonths = moment().diff(target, 'months');
  const diffYears = moment().diff(target, 'years');
  let text = '';

  console.assert(diffMinutes >= 0);

  if (diffMinutes === 0) {
    text = 'たった今';
  } else if (diffMinutes >= 1 && diffMinutes <= 59) {
    text = `${diffMinutes}分前`;
  } else if (diffHours >= 1 && diffHours <= 23) {
    text = `${diffHours}時間前`;
  } else if (diffDays >= 1 && diffDays <= 5) {
    text = `${diffDays}日前`;
  } else if (diffWeeks >= 1 && diffWeeks <= 4) {
    text = `${diffWeeks}週間前`;
  } else if (diffMonths >= 1 && diffMonths <= 11) {
    text = `${diffMonths}ヶ月前`;
  } else if (diffYears >= 1 && diffYears <= 11) {
    text = `${diffYears}年前`;
  }
  return text;
};