Date Formatting

Code

function formatDate(date, fmt = "YYYY-MM-DD HH:mm:ss") {
  const d = new Date(date);
  const map = {
    YYYY: d.getFullYear(),
    MM: String(d.getMonth() + 1).padStart(2, "0"),
    DD: String(d.getDate()).padStart(2, "0"),
    HH: String(d.getHours()).padStart(2, "0"),
    mm: String(d.getMinutes()).padStart(2, "0"),
    ss: String(d.getSeconds()).padStart(2, "0")
  };
  return fmt.replace(/YYYY|MM|DD|HH|mm|ss/g, m => map[m]);
}

Explanation

Implements flexible date formatting via regex replacement.

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