米国市場休場日 https://www.rakuten-sec.co.jp/web/foreign/us/holiday_us.html
2021/1/1 New Years Day
2021/1/18 Martin Luther King, Jr. Day
2021/2/15 Washington's Birthday
2021/4/2 Good Friday
2021/5/31 Memorial Day
2021/7/5 Independence Day
2021/9/6 Labor Day
2021/11/25 Thanksgiving Day
2021/12/24 Christmas
