Function cron

packages/effect/src/internal/schedule.ts:480–515

(expression: string | Cron.Cron, tz?: DateTime.TimeZone | string)

  (expression: Cron.Cron): Schedule.Schedule<[number, number]>
  (expression: string, tz?: DateTime.TimeZone | string): Schedule.Schedule<[number, number]>
} = (expression: string | Cron.Cron, tz?: DateTime.TimeZone | string): Schedule.Schedule<[number, number]> => {
  const parsed = Cron.isCron(expression) ? Either.right(expression) : Cron.parse(expression, tz)
  return makeWithState<[boolean, [number, number, number]], unknown, [number, number]>(
    [true, [Number.MIN_SAFE_INTEGER, 0, 0]],
    (now, _, [initial, previous]) => {
      if (now < previous[0]) {
        return core.succeed([
          [false, previous],
          [previous[1], previous[2]],
          ScheduleDecision.continueWith(Interval.make(previous[1], previous[2]))
        ])
      }

      if (Either.isLeft(parsed)) {
        return core.die(parsed.left)
      }

      const cron = parsed.right
      const date = new Date(now)

      let next: number
      if (initial && Cron.match(cron, date)) {
        next = now
      }

      next = Cron.next(cron, date).getTime()
      const start = beginningOfSecond(next)
      const end = endOfSecond(next)
      return core.succeed([
        [false, [next, start, end]],
        [start, end],
        ScheduleDecision.continueWith(Interval.make(start, end))
      ])
    }
  )
}

/** @internal */
export const dayOfMonth = (day: number): Schedule.Schedule<number> => {