Writing to a cell based on todays date - google-apps-script

Question

I am learning coding in Sheets, and have already jigsawed together a couple of games (based off very limited coding knowledge. Very fun to see it come together
Next task:
I am logging my hours spent doing "Growth" things (like learning, exercise, work etc.) vs "Leisure" things (like TV, games, FB scrolling etc). Up until now I just scroll down to today's date and add in the numbers manually. Would be fun to have a button at the top of my sheet that just adds hours to the "Growth" or "Leisure" cells for today.
I have used formulae in the cell G371 to reveal the A1 notation of my target cell, hoping I can use this info in a script to write to that cell:
=substitute(Cell("address",vlookup(A1,A2:D367,3)),"$","")
Where cell A1 contains =today()
and A2:A367 are all the dates in the year.
and columns C and D hold numbers for growth and leisure respectively.
Then I tried this code to try to see how to write to a cell. I realise I am probably missing some very fundamental knowledge...
var ss = SpreadsheetApp.getActiveSpreadsheet();
var cellname = ss.getRange('G371') // makes cellname refer to G371
var input = cellname.getValue() // makes 'input' return the contents of G371, in today's case its 'C120'
var test = ss.getRange(input) // hopefully reads 'C120' instead of "input"
test.setValue(1) // setting value to 1 for now, as I'm just testing cell
// referencing. later I will work on figuring out the
// math for the buttons. I'm not there yet.
So it didn't work. apparently the problem is with ss.getRange(input) but I don't know what to do about that.
So my question is how to write to a cell that is named in another cell?
hope it makes sense
Thanks!
PS Here is a copy of the sheet
https://docs.google.com/spreadsheets/d/1KkoCb8kY1XICMeB9bx65HXsldCS-fa75xJCaU52WGg8/edit?usp=sharing

Answer 1

The formula in the cell might be messing with the value you retrieve. To make sure that does not happen, you can use getDisplayValue() instead of getValue().
Another way:
Also, if you just want to retrieve the cell where to write today's growth (or leisure), you don't need to follow this roundabout way of creating a formula in another cell to reference this one. You can do this instead (check comments):
function todayGrowthCell() {
var sheet = SpreadsheetApp.getActiveSheet();
var date = Utilities.formatDate(new Date(), Session.getScriptTimeZone(), "d/M"); // Format today's date as in spreadsheet, in order to compare
var firstRow = 2; // Row where days start
var column = 3; // Column C (Growth)
var dates = sheet.getRange(2, 1, 366).getDisplayValues().map(row => row[0]); // Retrieve columns with dates (its display value, in order to compare with today's date, which is formatted accordingly)
var row = dates.indexOf(date) + firstRow; // Today's row
var cell = sheet.getRange(row, column); // Today's growth cell
cell.setValue(1); // Set value to today's growth cell
}