https://github.com/quantopian/trading_calendars/blob/19c4b677f13147928d34be5a3da50ba4161be45d/trading_calendars/exchange_calendar_xnys.py#L164
trading_calendars/trading_calendars/exchange_calendar_xnys.py
Line 164 in 19c4b67