diff --git a/src/app/ui/forms/sub.tsx b/src/app/ui/forms/sub.tsx
index 2d6d20e..52a6496 100644
--- a/src/app/ui/forms/sub.tsx
+++ b/src/app/ui/forms/sub.tsx
@@ -40,6 +40,30 @@ const FormSchema = z.object({
 	responded: z.date().transform((date) => date.toString()).optional(),
 	responseId: z.coerce.number()
 })
+	.refine(object => {
+		const submitted = new Date(object.submitted)
+		const responded = object.responded ? new Date(object.responded) : null
+		return responded >= submitted || responded === null
+	},
+		{
+			path: ["responded"],
+			message: "'Responded' must be a later date than 'submitted'"
+		})
+	.refine(object => {
+		if (object.responded) {
+			//there is a 'responded' date and the response is not 'pending'
+			return object.responseId !== 7
+		}
+		if (!object.responded) {
+			//there is not a 'responded' date and the response is pending
+			return object.responseId === 7
+		}
+	},
+		{
+			path: ["responseId"],
+			message: "A pending response cannot have a date, and a non-pending response must have a date"
+		}
+	)
 
 
 export default function SubmissionForm({ stories, pubs, responses, createSub }) {