Function parseTimezoneOffset

src/utils/parseAuthor.js:17–21

(offset)

// but can also default to +0 was extraordinary.

function parseTimezoneOffset(offset) {
  let [, sign, hours, minutes] = offset.match(/(\+|-)(\d\d)(\d\d)/)
  minutes = (sign === '+' ? 1 : -1) * (Number(hours) * 60 + Number(minutes))
  return negateExceptForZero(minutes)
}

function negateExceptForZero(n) {
  return n === 0 ? n : -n