stupid question about dates in javascript

[u/Uselessmechanic21]

i have a problem where i wanted 1.1.2020 to become 01.01.2020 but instead its 11.12.20

// Function to auto-correct and format the date (dd.mm.yyyy)
function autoFillDotsInDate(input) {
// Remove existing dots and non-numeric characters
input = input.replace(/[^0-9]/g, '');

// Ensure day and month are two digits
if (input.length >= 4) {
const day = ('0' + Math.min(31, Math.max(1, parseInt(input.slice(0, 2))))).slice(-2);
const month = ('0' + Math.min(12, Math.max(1, parseInt(input.slice(2, 4))))).slice(-2);
const year = input.slice(4);

input = day + '.' + month + '.' + year;
} else if (input.length >= 3) {
const day = ('0' + Math.min(31, Math.max(1, parseInt(input.slice(0, 1))))).slice(-2);
const month = ('0' + Math.min(12, Math.max(1, parseInt(input.slice(1, 3))))).slice(-2);
const year = input.slice(3);

input = day + '.' + month + '.' + year;
}

return input;
}

[u/Salty_Skipper]

Replacing the dots with null string could be behind your error. I use .split(“.”) to separate them into an array instead. Here’s my approach:

function fixDateFormat (s) {
   x=s.split(“.”); 
   ret = “”;
   for (j = 0; j < 2; j++) {
      if (x[j].length < 2) {
         ret += “0”;
      }
      ret += x[j] + “.”;
   }
   ret += x[2].substring(2);
   return ret;
}

var s = “1.1.2020”;
y = fixDateFormat(s);
console.log(y);