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The date of birth 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 of birth 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. Open the file and check the date format and amend if necessary.

If the date format is valid then you may not have provided a date that exists, for example 30 February, 31 April or 31 June. You should check the date you’ve provided against a calendar tool if necessary.

You can then submit the file again after making the correction.