diff --git a/src/helpers/date-helper.js b/src/helpers/date-helper.js
index 59ffa5745..f59ac7ba8 100644
--- a/src/helpers/date-helper.js
+++ b/src/helpers/date-helper.js
@@ -1,3 +1,15 @@
+// .NET serializes an unset DateTime as DateTime.MinValue ("0001-01-01T00:00:00").
+// Treat that as "no date" so it doesn't masquerade as a real, validation-passing value.
+const DOTNET_MIN_DATE_PREFIX = "0001-01-01";
+
+export function isDotNetMinDate(value) {
+    return typeof value === "string" && value.startsWith(DOTNET_MIN_DATE_PREFIX);
+}
+
+export function normalizeDotNetMinDate(value) {
+    return isDotNetMinDate(value) ? null : value;
+}
+
 export function getDateDifferenceInDays(startDate, endDate) {
     // Create date objects from the input strings
     var date1 = new Date(endDate);
diff --git a/src/store/index.js b/src/store/index.js
index 509c34093..fc786d3b9 100644
--- a/src/store/index.js
+++ b/src/store/index.js
@@ -40,7 +40,7 @@ import {
     getPromoCodeWithoutBundleIdentifier,
     removeCurrentlyActivePromoCodesFromInactivePromos,
 } from "@/helpers/promotions-helper";
-import { getDateDifferenceInDays } from "@/helpers/date-helper";
+import { getDateDifferenceInDays, normalizeDotNetMinDate } from "@/helpers/date-helper";
 import sharedMutations from "./vuex-shared-mutations/vuexSharedMutations";
 import {
     coverageStatus,
@@ -848,7 +848,9 @@ export const mutations = {
         state.order.damage.glassToReplace = sessionInformation.order.damage.glassToReplace;
         state.order.damage.isRepair = sessionInformation.order.damage.isRepair;
         state.order.damage.numberOfChips = sessionInformation.order.damage.numberOfChips;
-        state.order.damage.dateOfLoss = sessionInformation.order.damage?.dateOfLoss;
+        state.order.damage.dateOfLoss = normalizeDotNetMinDate(
+            sessionInformation.order.damage?.dateOfLoss
+        );
         state.order.damage.damageCause = sessionInformation.order.damage?.damageCause;
 
         state.order.damage.partQuestionAnswers =