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The start date you've entered isn't valid. Please check the information you've entered is a valid calendar date in YYYY-MM-DD format and try again.

The date you’ve entered is either incorrect or in the wrong format. Please check and enter a valid date.

The start date should be in the format YYYY-MM-DD.

If you've created or edited your file in Microsoft excel the format might have been altered automatically. You’ll need to open the file, check the date format and amend if necessary.