Excel, find date based on day name in cell - excel

Question

I have table:
I'm trying to find dates of specific day (here: Monday) in specific month in 5 cells below DATE cell.
For example, Mondays in March - 6.03.2017, 13.03.2017, 20.03.2017, 27.03.2017,
I'm "playing" with it for about 2h, trying week.day, mod, choose and anything iC can find in Google but no luck.
Any ideas?

Answer 1

This kind of task can be done more easily by dividing steps. I made an example sheet. When you input some values in yellow cells, output(calculated by formulae) will be displayed in green cells. What you really need is weekday function, plus I used date, join, day, etc.
Of course, this can be done via VBA script or Apps Script, which can be undoubtedly much more elegant. I added the script to the above sheet. The red cells are filled by this custom function. Its logic is almost the same as the flow of the sheet.
function getDaysWithNames(year, month, name) {
name = name.slice(0,3).toUpperCase();
var t;
//get the first day
var day;
for(day=1; day<8; day++) {
t = new Date(year, month-1, day).toDateString().slice(0,3).toUpperCase();
if(t == name) break;
}
//first three days are always valid because they are <= 21
var validDays = [day, day+7, day+14];
//test the fourth day
day += 21;
t = new Date(year, month-1, day).getDate();
if(t == day) validDays.push(day); else return validDays;
//test the fifth day
day += 7;
t = new Date(year, month-1, day).getDate();
if(t == day) validDays.push(day);
return validDays;
}