Calculate the working days between two dates excluding weekends and holidays

Anonymous  thanks for the article.

May I ask how we can deal with those workday on Saturday & Sunday?
eg:

for wk 1,  Sat, Sun both will not be workday

for wk 2, Sat will be workday,  Sun doesn't need to work

for wk 3, back to normal, both Sat,Sun will not work

for wk 4, Sun will be workday, Sat will be not work

in weekend para, we can only input 1-7 or 11-17, which limits the type of weekend.

thanks.