readable?

encodeDates.js

const toISOString = ifElse(
  either(isNil, compose(isEmpty, trim)),
  always(null),
  d => new Date(d).toISOString()
)

function toISOString (date) {
  if (isNil(date) || isEmpty(date.trim())) {
    return null
  }
  return new Date(date).toISOString()
}