Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var method1 = function () { return this.toISOString().slice(0, 10); };
    var method2 = function () {
      return this.getFullYear() + '-' + (this.getMonth() + 1) + '-' + this.getDate();
    };
    
    var date = new Date();
  };
</script>

Test runner

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method1.call(date);

method2.call(date);

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