Calculating the third workday of every month

Why should the OP search the Internet? We don’t have a problem with questions like this and he/she has chosen to ask here.

Jk2391 - there are instructions at the top of the page explaining how to attach your sample workbook.

Try this.

	A	B	C
1	6/1/2020	In A1: =TODAY()
2	1	Update on 03/01/20	In b2 and filled down: ="Update on "&TEXT(WORKDAY.INTL(EOMONTH(DATE(YEAR($A$1),$A2,1),-1),3,),"DD/MM/YY")
3	2	Update on 05/02/20
4	3	Update on 04/03/20
5	4	Update on 03/04/20
6	5	Update on 05/05/20
7	6	Update on 03/06/20
8	7	Update on 03/07/20
9	8	Update on 05/08/20
10	9	Update on 03/09/20
11	10	Update on 05/10/20
12	11	Update on 04/11/20
13	12	Update on 03/12/20