Matching a date on a calendar to another field - date

Question

Ok, I have a calendar on my page and each day is a formatted version of that date, eg.
Jan 2021
1 2 3 4
5 6 7 8
etc..
so the 1 cell will contain 1/1/2021 (but formatted to just show '1' [d])
I also have a cell (K5) on that page for a user to enter a date eg:[1/1/2021]
What i'd like is a script that changes the border colour of the day in the calendar if it matches the user entry cell.
The code:
function onEdit(e) {
var ss = SpreadsheetApp.getActive();
var sheet = ss.getActiveSheet();
var date = sheet.getRange("K5").getValue();
if (e.range.getValue()== date) {
e.range.setBorder(true, true, true, true, true, true, "red", SpreadsheetApp.BorderStyle.solid); }
};
This doesn't work and I can't think of a way of having the code work for every cell of the calendar (there are 2 years worth so over 1000 cells).
It doesn't need to be onEdit, i was just testing to see if the actual setBorder function worked (which it does)
Also, I cant use conditional formatting as I've already used that to change to bg and font colours for something else (and there's no option to change boarder colour anyway)
I've made a mini version with just Jan if you'd like to have a look and see what you can do:
https://docs.google.com/spreadsheets/d/1oV4lE8cQB-e2bVc_HgiGM31ivk3uHxPcqsSdLdCxsmQ/edit?usp=sharing

Answer 1

One alternative to looking for all the dates would be to use a formula to show the dates and their addresses in a different sheet. This formula will output a series of dates and their addresses for your holidays. It can then be read with an onEdit() script to put borders on the correct addresses:
Formula:
=ARRAYFORMULA(IFERROR(QUERY(SPLIT(FLATTEN(N(Calendar!E9:AY)&"|"&ROW(Calendar!E9:AY)&"|"&COLUMN(Calendar!E9:AY)&"|"&LEN(TO_TEXT(Calendar!E9:AY))),"|",0,0),"select Col1,Col2,Col3 where Col4<3 and ("&TEXTJOIN(" or",TRUE," Col1="&FILTER(Calendar!BE28:BE100,Calendar!BE28:BE100<>""))&")")))
Script:
function onEdit(e){
holidayBorders(e);
}
function holidayBorders(e){
var sheet = e.range.getSheet();
if(e.value && sheet.getName()=='Calendar' && e.range.getColumn()==57 && e.range.getRow() >= 28){
SpreadsheetApp.flush();
Utilities.sleep(10000);
var datasheet = e.source.getSheetByName('DATA');
var rcs = datasheet.getRange('AQ3:AR').getValues().filter(e=> e[0]);
for (let i=0;i<rcs.length;i++){
sheet.getRange(rcs[i][0],rcs[i][1]).setBorder(true, true, true, true, true, true, "red", SpreadsheetApp.BorderStyle.solid);
}
}
}

Answer 2

You could do the following:
Get all values in your range, using getValues().
Iterate through all values in the resulting 2D array.
For each value, check if (1) the value is a Date (for example, using instanceof) and whether the two dates are from the same day (for example, doing this).
If both conditions are met, set the border.
Code snippet:
function setBorders() {
var ss = SpreadsheetApp.getActive();
var sheet = ss.getActiveSheet();
var date = sheet.getRange("K5").getValue();
var firstRow = 7;
var firstCol = 5;
var data = sheet.getRange(firstRow, firstCol, sheet.getLastRow() - firstRow + 1, sheet.getLastColumn() - firstCol + 1).getValues();
data.forEach((row, i) => {
row.forEach((value, j) => {
if (value instanceof Date && sameDay(date, value)) {
sheet.getRange(i + firstRow, j + firstCol).setBorder(true, true, true, true, true, true, "red", SpreadsheetApp.BorderStyle.solid);
}
});
})
}
function sameDay(date1, date2) {
return date1.getFullYear() === date2.getFullYear() &&
date1.getMonth() === date2.getMonth() &&
date1.getDate() === date2.getDate();
}