Js date conversion to standard format

 var date = new Date(a);var y = date.getFullYear();
 var m = date.getMonth() + 1;
 m = m < 10 ? '0' + m : m;  
 var d = date.getDate();    
 console.log(y + The '-' + m + The '-' + d);
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Eg: 2021-06-10