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プレミアムフライデーに備えよう!Railsで次の月末の金曜日を取得する!

More than 3 years have passed since last update.

ちまたでプレミアムフライデーが話題になってたので、Railsでプレミアムフライデーの日付を取得するメソッドを作った。

def next_premium_friday
  now = DateTime.now
  premium_friday = this_month_premium_friday(now)
  if now > premium_friday
    premium_friday = this_month_premium_friday(now + 1.month)
  end
  premium_friday
end

# 指定された日付と同じ月の月末の金曜日を取得するメソッド
def self.this_month_premium_friday(datetime)
  end_of_month = datetime.end_of_month
  case end_of_month.wday
  when 0..4
    difference_wday = -2 - end_of_month.wday
  when 5..6
    difference_wday = 5 - end_of_month.wday
  end
  premium_friday = end_of_month + difference_wday.day
end
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