December 11, 2021 (Saturday) - business day
December 23, 2021 (Thursday) - last working day before Christmas
December 27, 2021 (Monday) - the first working day after Christmas
December 30, 2021 (Thursday) - the last working day of the year
December 31, 2021 (Friday) - public holidays
January 3, 2022 (Monday) - the first working day of the year