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JavaScriptで◯◯分前を実装する

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JSでTwitterとかFacebookとかSNSでよく表示される◯◯分前の実装
検索しても変なライブラリー入れるのばっかりヒットするので作った

function displayTime(unixTime) {
  var date = new Date(unixTime)
  var diff = new Date().getTime() - date.getTime()
  var d = new Date(diff);

  if (d.getUTCFullYear() - 1970) {
    return d.getUTCFullYear() - 1970 + '年前'
  } else if (d.getUTCMonth()) {
    return d.getUTCMonth() + 'ヶ月前'
  } else if (d.getUTCDate() - 1) {
    return d.getUTCDate() - 1 + '日前'
  } else if (d.getUTCHours()) {
    return d.getUTCHours() + '時間前'
  } else if (d.getUTCMinutes()) {
    return d.getUTCMinutes() + '分前'
  } else {
    return d.getUTCSeconds() + '秒前'
  }
}
console.log(
  displayTime(1437715788375)
)
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