diff --git a/packages/prisma/zod-utils.ts b/packages/prisma/zod-utils.ts
index 114387d79a..44d9202f75 100644
--- a/packages/prisma/zod-utils.ts
+++ b/packages/prisma/zod-utils.ts
@@ -58,6 +58,20 @@ export const recurringEventType = z
   })
   .nullable();
 
+// dayjs iso parsing is very buggy - cant use :( - turns ISO string into Date object
+export const iso8601 = z.string().transform((val, ctx) => {
+  const time = Date.parse(val);
+  if (!time) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "Invalid ISO Date",
+    });
+  }
+  const d = new Date();
+  d.setTime(time);
+  return d;
+});
+
 export const bookingLimitsType = z
   .object({
     PER_DAY: z.number().optional(),