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Date.prototype.toCustomDateString = function() {
  const year = this.getFullYear();
  const month = ('0' + (this.getMonth() + 1)).slice(-2); // Months are 0-based
  const day = ('0' + this.getDate()).slice(-2);
  return `${year}-${month}-${day}`;
};

// Create a new Date object
let currentDate = new Date();

// Display the formatted current date in the console
console.log(currentDate.toCustomDateString