Function shift

packages/console/core/src/util/date.ts:23–26

(year: number, month: number, delta: number)

  }

  function shift(year: number, month: number, delta: number) {
    const total = year * 12 + month + delta
    return [Math.floor(total / 12), ((total % 12) + 12) % 12] as const
  }

  let y = now.getUTCFullYear()
  let m = now.getUTCMonth()