diff --git a/runner/src/server/forms/ReportAnOutbreak.json b/runner/src/server/forms/ReportAnOutbreak.json
index 6049b0ce1..4948c3304 100644
--- a/runner/src/server/forms/ReportAnOutbreak.json
+++ b/runner/src/server/forms/ReportAnOutbreak.json
@@ -443,7 +443,7 @@
           "name": "S4Q7",
           "options": {
             "required": false,
-            "maxDaysInFuture": ""
+            "maxDaysInFuture": "0"
           },
           "type": "DatePartsField",
           "title": "S4Q7. Symptom onset date of second case",
@@ -455,7 +455,7 @@
           "name": "S4Q8",
           "options": {
             "required": true,
-            "maxDaysInFuture": ""
+            "maxDaysInFuture": "0"
           },
           "type": "DatePartsField",
           "title": "S4Q8. Symptom onset date of most recent case",
@@ -704,7 +704,7 @@
           "name": "S5Q12",
           "options": {
             "required": true,
-            "maxDaysInFuture": ""
+            "maxDaysInFuture": "0"
           },
           "type": "DatePartsField",
           "title": "S5Q12. Symptom onset date of first case (confirmed flu, suspected flu OR chest infections)",
@@ -716,7 +716,7 @@
           "name": "S5Q13",
           "options": {
             "required": false,
-            "maxDaysInFuture": ""
+            "maxDaysInFuture": "0"
           },
           "type": "DatePartsField",
           "title": "S5Q13. Symptom onset date of second case (confirmed flu, suspected flu OR chest infections)",
@@ -728,7 +728,7 @@
           "name": "S5Q14",
           "options": {
             "required": true,
-            "maxDaysInFuture": ""
+            "maxDaysInFuture": "0"
           },
           "type": "DatePartsField",
           "title": "S5Q14. Symptom onset date of most recent case (confirmed flu, suspected flu OR chest infections)",
@@ -872,7 +872,7 @@
           "name": "S6Q4",
           "options": {
             "required": true,
-            "maxDaysInFuture": ""
+            "maxDaysInFuture": "0"
           },
           "type": "DatePartsField",
           "title": "S6Q4. Symptom onset date of first case",
@@ -884,7 +884,7 @@
           "name": "S6Q5",
           "options": {
             "required": false,
-            "maxDaysInFuture": ""
+            "maxDaysInFuture": "0"
           },
           "type": "DatePartsField",
           "title": "S6Q5. Symptom onset date of second case",
@@ -896,7 +896,7 @@
           "name": "S6Q6",
           "options": {
             "required": true,
-            "maxDaysInFuture": ""
+            "maxDaysInFuture": "0"
           },
           "type": "DatePartsField",
           "title": "S6Q6. Symptom onset date of most recent case",