This is pretty common. The IRS requires your financial intuition to report the contributions on the date made, irrespective of the year for which they are intended as a contribution.
That is, in part, because it's really the company making the contribution, rather than the individual. Your own records will be sufficient to show which year the amounts are for, should the IRS ever inquire.
If you need more time, please note that SEP-IRA contributions are one of the few types of retirement plan contributions that can be made as late as October so long as you timely file an extension for your personal tax return.
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