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    If you want to retrieve data from a CSV in a certain format (in your case your date), you'll need to import it versus just opening the file. You can start with Data -> Get & Transform Data -> From Text/CSV. This is basically a power query transformation.
    – gns100
    Commented Feb 29 at 16:01
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    Can you add another column, interpreting those string fields as Excel date-time? Then when saved in CSV, perhaps Excel can store them in a format easily brought back.
    – DrMoishe Pippik
    Commented Feb 29 at 16:17
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    CSV has no context of an Excel date, which is what Excel, is using to display the time in a specific format. So you will have to write the date as a string to another column.
    – Ramhound
    Commented Feb 29 at 16:18
  • CSV is just values seperated by commas. you are lucky excel trys at all to treat it as a date instead of raw text.
    – Frank Thomas
    Commented Feb 29 at 18:58
  • The date and time in the CSV file should be saved as text in the system format. They will be read in the same format. Therefore, you need to change the format of these cells after loading CSV into Excel, or change the system format to the one you want in the spreadsheet.
    – MGonet
    Commented Feb 29 at 20:38