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format javascript date in ISO 8601

There is a solution in StackOverflow:

/* use a function for the exact format desired... */
function ISODateString(d){
 function pad(n){return n<10 ? '0'+n : n}
 return d.getUTCFullYear()+'-'
      + pad(d.getUTCMonth()+1)+'-'
      + pad(d.getUTCDate())+'T'
      + pad(d.getUTCHours())+':'
      + pad(d.getUTCMinutes())+':'
      + pad(d.getUTCSeconds())+'Z'}

var d = new Date();
print(ISODateString(d)); // prints something like 2009-09-28T19:03:12Z

But there is already a function for this: toISOString, it came with ecmascript 5. Unfortunately, not all browsers support this, to solve this problem, we can provide our own prototype function for Date if it doesn’t exist:

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