Factorial-Type Numerical Calender 2021

This short work brings factorial-type numerical representations of the calender. It is based on a functional equation of three variables representing day, month and year. The results are based on 5! and 6!. First half of the year (January to  June) is with 5!, and the second half of the year (July to December) is with 6!. It is given for the years ending in 21 and 2021. The the dates of other years can be calculated on similar lines.