Adds functionality to check if a valid date is selected in the seeding input log.
closes #231
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Pull Request Description
Adds functionality to check if a valid date is selected in the seeding input log. closes #231
Licensing Certification
FarmData2 is a Free Cultural Work and all accepted contributions are licensed as described in the LICENSE.md file. This requires that the contributor holds the rights to do so. By submitting this pull request I certify that I satisfy the terms of the Developer Certificate of Origin for its contents.