Here are a few options for the post tag description, taking into account different possible contexts and levels of detail:

**Option 1: Simple and Concise (General Use)**

* **Description:** 標示與股票除息時間相關的文章。 (Marks articles related to ex-dividend dates.)

**Option 2: More Descriptive (For Financial Articles)**

* **Description:** 股票交易中，除息時間的資訊。包含除息日期、股票停止過戶日等重要時間點。 (Information on ex-dividend times in stock trading. Includes ex-dividend dates, stock record dates, and other important dates.)

**Option 3: Emphasizing Relevance (If the blog has a certain audience)**

* **Description:** 了解股票除息時間對您投資決策的影響。 (Understanding the impact of ex-dividend times on your investment decisions.)

**Option 4: Slightly more detailed (suitable for use in a more technical article)**

* **Description:** 關於公司派發股息和紅利時，股票從股息中扣除的日期。包含除息日、股息發放日期等相關時間節點的訊息。 (Information regarding ex-dividend dates, the date where a stock is deducted from dividends, and includes dividends pay date and other relevant related-time-node information.)

**Choosing the Best Option:**

* Consider the overall tone and content of your WordPress blog.
* Think about your target audience and their level of financial knowledge.
* Select the description that best reflects the focus of the tagged content.

I would recommend either option 1, option 2, or option 4.