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    Bài 66: Cách không cho nhập ngày không hợp lệ trong Excel

    ...In the **Data Validation** dialog box, select **Date** from the **Allow** list, and then specify the valid date formats. * **Use the **=ISDATE()** function.** The **=ISDATE()** function can be used to check if a value is a valid date. To use this function, enter the following formula into a...
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