import { fromZonedTime, toZonedTime } from "date-fns-tz"
import { add, differenceInHours, parseISO } from "date-fns"

const dstOffset = (value: any) => {
  const zone = "America/Chicago"

  const start = toZonedTime(fromZonedTime(parseISO(value), zone), zone)
  const end = toZonedTime(fromZonedTime(add(parseISO(value), { days: 1 }), zone), zone)

  const diff = differenceInHours(end, start)

  return diff
}

console.log(dstOffset("2024-03-10"))

//=> Expected output
// 23

//=> Problematic output
// 24