If you want to sort in date order the data has to be recognized by Excel as date format. When you see the A to Z sort option, that is for text. Hence, you data is not being recognized by Excel as dates.
Trouble shoot- Sorting Dates and Times
http://excelribbon.tips.net/T005678_Sorting_Dates_and_Times.html
One of the strong features of Excel is its ability to sort information in a worksheet. When it doesn’t sort information as you expect, however, it can be confusing. Here’s a look at why your dates and times might not sort the way you want them to.
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Convert date to serial number in Excel?
https://www.extendoffice.com/documents/excel/5293-excel-date-to-serial-number.html
If you receive a sheet with some dates, now you want to Convert these dates to serial numbers as below screenshot shown, how can you quickly solve it? Here I have some ways can do you a nice favor.
. * Convert date to serial number with Format Cells
. * Convert date to serial number with DATEVALUE
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@ Convert date format between European and US in Excel?
https://www.extendoffice.com/documents/excel/4162-excel-convert-european-date-to-us-date.html
If you work in an international company, you will receive sheets from different counties every day which may record dates with different date formats. For example, the European counties record dates in the date format dd/mm/yyyy, while US record dates in the date format mm/dd/yyyy. In this case, how can you quickly convert the date format between European countries and US in Excel?
. * Convert texted date from European dd/mm/yyyy to US mm/dd/yyyy with formula
. * Convert date format between European and US with Format Cells
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@ Change & Convert UK Dates to US – Change Long / Short Date Formatshttps://www.myexcelonline.com/blog/convert-uk-dates-to-us/
https://www.myexcelonline.com/wp-content/uploads/2018/02/Support-European-Date-Format-in-Excel-1.gif
Have you ever come across a scenario where your dates in Excel are in the wrong format?
Say you type in 01/05/2018 which actually means January 5, 2018 in the US but it shows as May 1, 2018! It drives me nuts because the entire spreadsheet of dates is interpreted incorrectly by Excel!
That happens because your computer’s region settings are in UK format and need to be changed to a US format.
ET MR Dates and Times.docx .