Using a date reviver in JSON.parse

gistfile1.js

function dateReviver(key, value) {
  if (typeof value === 'string') {
    var a = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
    if (a) {
      return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], +a[5], +a[6]));
    }
  }
  return value;
};

JSON.parse(serialized_object, dateReviver);

Note this doesn't revive dates that have an offset. Ex. 2018-07-20:08:00:00-04:00 🤓

Solution:

// ...
var a = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)(Z|([+\-])(\d{2}):(\d{2}))$/.exec(value);
if (a) {
  return new Date(value);
}
// ...