jsondate.js

// Source: https://github.com/szwacz/fs-jetpack/blob/master/lib/read.js#L22-L32
const fromJsonDate = value => {
  const reISO = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*))(?:Z|(\+|-)([\d|:]*))?$/
  if (typeof value === 'string') {
    if (reISO.exec(value)) {
      return new Date(value)
    }
  }
  return value
}

const someDate = new Date()
const stringified = someDate.toJSON()
const dateified = fromJsonDate(stringified)