diff --git a/src/electron/frontend/core/components/pages/guided-mode/data/GuidedMetadata.js b/src/electron/frontend/core/components/pages/guided-mode/data/GuidedMetadata.js
index f1deca9a4..a5db5846b 100644
--- a/src/electron/frontend/core/components/pages/guided-mode/data/GuidedMetadata.js
+++ b/src/electron/frontend/core/components/pages/guided-mode/data/GuidedMetadata.js
@@ -279,6 +279,8 @@ export class GuidedMetadataPage extends ManagedPage {
 
         delete results.__generated; // Ignore generated results. NOTE: See if this fails
 
+        const pageThis = this;
+
         // Create the form
         const form = new JSONSchemaForm({
             identifier: instanceId,
@@ -333,7 +335,10 @@ export class GuidedMetadataPage extends ManagedPage {
 
             onUpdate: () => (this.unsavedUpdates = "conversions"),
 
-            validateOnChange: (...args) => validateOnChange.call(this, ...args),
+            validateOnChange: function (...args) {
+                this.timezone = pageThis.workflow?.timezone.value; // Set the timezone for the form
+                return validateOnChange.call(this, ...args);
+            },
             onlyRequired: false,
             onStatusChange: (state) => this.manager.updateState(`sub-${subject}/ses-${session}`, state),
 
diff --git a/src/electron/frontend/core/components/pages/guided-mode/setup/GuidedSubjects.js b/src/electron/frontend/core/components/pages/guided-mode/setup/GuidedSubjects.js
index e385b843f..26c77c67e 100644
--- a/src/electron/frontend/core/components/pages/guided-mode/setup/GuidedSubjects.js
+++ b/src/electron/frontend/core/components/pages/guided-mode/setup/GuidedSubjects.js
@@ -102,6 +102,7 @@ export class GuidedSubjectsPage extends Page {
     connectedCallback() {
         super.connectedCallback();
 
+        const pageThis = this;
         const schema = preprocessMetadataSchema(undefined, true).properties.Subject;
 
         const modal = (this.#globalModal = createGlobalFormModal.call(this, {
@@ -110,7 +111,8 @@ export class GuidedSubjectsPage extends Page {
             validateEmptyValues: null,
             schema,
             formProps: {
-                validateOnChange: (localPath, parent, path) => {
+                validateOnChange: function (localPath, parent, path) {
+                    this.timezone = pageThis.workflow?.timezone?.value;
                     return validateOnChange.call(this, localPath, parent, ["Subject", ...path]);
                 },
             },
diff --git a/src/electron/frontend/core/validation/index.js b/src/electron/frontend/core/validation/index.js
index f4fd1b4db..b7311e781 100644
--- a/src/electron/frontend/core/validation/index.js
+++ b/src/electron/frontend/core/validation/index.js
@@ -68,7 +68,7 @@ export async function validateOnChange(name, parent, path, value) {
                 method: "POST",
                 headers: { "Content-Type": "application/json" },
                 body: JSON.stringify({
-                    timezone: this.workflow?.timezone?.value,
+                    timezone: this.timezone,
                     parent: copy,
                     function_name: resolvedFunctionName,
                 }),