If you are exporting the results of a SQL Server query to excel typically the recipient of the file wants the dates referenced in the format “dd/mm/yyyy hh:mm:ss” or “dd/mm/yyyy” not in the usual database format yyyy-mm-dd.
The below query formats the datetime as desired. Note that the letter m representing month is capitalised. If they are not the engine will interpret the lowercase letter m as minute so you will end up with days, minutes, years.
Also not that the letter h representing the hours is also capitalised. Capitalising the h makes the time output with the 24 hour format. Lowercase h will be 12 hour format. It is highly recommended not to use the lowercase h.
SELECT FORMAT(GETDATE(), 'dd/MM/yyyy HH:mm:ss', 'en-us')
If you only want the date and not time just remove the relevant text, i.e. just date dd/MM/yyyy or datetime without second dd/MM/yyyy HH:mm.