Function clampBoundaryDay

packages/effect/src/Cron.ts:968–974

(targetMonthIndex: number)

        const currentMonth = current.getUTCMonth() + 1
        const nextMonth = table.month[currentMonth]
        const clampBoundaryDay = (targetMonthIndex: number): number => {
          const maxDayInMonth = daysInMonth(new Date(Date.UTC(current.getUTCFullYear(), targetMonthIndex + 1, 0)))
          if (cron.days.size !== 0 && cron.weekdays.size === 0) {
            return reverse ? table.day[maxDayInMonth] ?? maxDayInMonth : boundary.day
          }
          return reverse ? maxDayInMonth : 1
        }
        if (nextMonth === undefined) {
          current.setUTCFullYear(current.getUTCFullYear() + tick)
          current.setUTCMonth(boundary.month, clampBoundaryDay(boundary.month))