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Hello, I am Leonielhou, an Independent Advisor and a user like you, I am happy to help clarify any questions you may have.
I believe the values in the date field are being treated as text rather than dates, which is why the sort isn't working as expected and the DATEVALUE function isn't working.
One way to fix this would be to use the DATE function to convert the text values to actual dates. You can use the DATE function like this:
=DATE(year, month, day)
You can extract the year, month, and day values from the text field using the YEAR, MONTH, and DAY functions, respectively. For example:
=DATE(YEAR(A2), MONTH(A2), DAY(A2))
This will convert the text in cell A2 to a date value. You can then copy this formula down to the other cells in the column to convert all the values to dates.
Once the values are converted to dates, you should be able to sort the column by date.
I hope I am able to give valuable information based on what I have understood on your concern.