MailChimp EConvertError is not a valid date and time

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I am getting this error when trying to log into the mailchimp section of CRM admin. Any ideas?

Dec 10 2020 12:39:06.333 12932 11952 1 UserActionException,ErrMsg '12/10/202028:56' is not a valid date and time
Dec 10 2020 12:39:06.334 12932 11952 1 : EConvertError: '12/10/202028:56' is not a valid date and time<br>
Dec 10 2020 12:39:06.364 12932 11952 1 Creating stack-trace ID:605713055. Error message is "'12/10/202028:56' is not a valid date and time"