diff --git a/.changeset/odd-yaks-love.md b/.changeset/odd-yaks-love.md
new file mode 100644
index 000000000..0926d4665
--- /dev/null
+++ b/.changeset/odd-yaks-love.md
@@ -0,0 +1,5 @@
+---
+"@hey-api/openapi-ts": patch
+---
+
+fix(valibot): use `isoTimestamp` instead of `isoDateTime` for date-time format
diff --git a/packages/openapi-ts-tests/test/__snapshots__/2.0.x/plugins/valibot/default/valibot.gen.ts b/packages/openapi-ts-tests/test/__snapshots__/2.0.x/plugins/valibot/default/valibot.gen.ts
index ea4d8d500..64359ac22 100644
--- a/packages/openapi-ts-tests/test/__snapshots__/2.0.x/plugins/valibot/default/valibot.gen.ts
+++ b/packages/openapi-ts-tests/test/__snapshots__/2.0.x/plugins/valibot/default/valibot.gen.ts
@@ -365,7 +365,7 @@ export const vModelWithPattern = v.object({
     key: v.pipe(v.string(), v.maxLength(64), v.regex(/^[a-zA-Z0-9_]*$/)),
     name: v.pipe(v.string(), v.maxLength(255)),
     enabled: v.optional(v.pipe(v.boolean(), v.readonly())),
-    modified: v.optional(v.pipe(v.pipe(v.string(), v.isoDateTime()), v.readonly())),
+    modified: v.optional(v.pipe(v.pipe(v.string(), v.isoTimestamp()), v.readonly())),
     id: v.optional(v.pipe(v.string(), v.regex(/^\d{2}-\d{3}-\d{4}$/))),
     text: v.optional(v.pipe(v.string(), v.regex(/^\w+$/))),
     patternWithSingleQuotes: v.optional(v.pipe(v.string(), v.regex(/^[a-zA-Z0-9']*$/))),
diff --git a/packages/openapi-ts-tests/test/__snapshots__/3.0.x/plugins/valibot/default/valibot.gen.ts b/packages/openapi-ts-tests/test/__snapshots__/3.0.x/plugins/valibot/default/valibot.gen.ts
index 4715a60ef..060674cc3 100644
--- a/packages/openapi-ts-tests/test/__snapshots__/3.0.x/plugins/valibot/default/valibot.gen.ts
+++ b/packages/openapi-ts-tests/test/__snapshots__/3.0.x/plugins/valibot/default/valibot.gen.ts
@@ -691,7 +691,7 @@ export const vModelWithPattern = v.object({
     key: v.pipe(v.string(), v.maxLength(64), v.regex(/^[a-zA-Z0-9_]*$/)),
     name: v.pipe(v.string(), v.maxLength(255)),
     enabled: v.optional(v.pipe(v.boolean(), v.readonly())),
-    modified: v.optional(v.pipe(v.pipe(v.string(), v.isoDateTime()), v.readonly())),
+    modified: v.optional(v.pipe(v.pipe(v.string(), v.isoTimestamp()), v.readonly())),
     id: v.optional(v.pipe(v.string(), v.regex(/^\d{2}-\d{3}-\d{4}$/))),
     text: v.optional(v.pipe(v.string(), v.regex(/^\w+$/))),
     patternWithSingleQuotes: v.optional(v.pipe(v.string(), v.regex(/^[a-zA-Z0-9']*$/))),
@@ -701,8 +701,8 @@ export const vModelWithPattern = v.object({
 
 export const vFile = v.object({
     id: v.optional(v.pipe(v.pipe(v.string(), v.minLength(1)), v.readonly())),
-    updated_at: v.optional(v.pipe(v.pipe(v.string(), v.isoDateTime()), v.readonly())),
-    created_at: v.optional(v.pipe(v.pipe(v.string(), v.isoDateTime()), v.readonly())),
+    updated_at: v.optional(v.pipe(v.pipe(v.string(), v.isoTimestamp()), v.readonly())),
+    created_at: v.optional(v.pipe(v.pipe(v.string(), v.isoTimestamp()), v.readonly())),
     mime: v.pipe(v.string(), v.minLength(1), v.maxLength(24)),
     file: v.optional(v.pipe(v.pipe(v.string(), v.url()), v.readonly()))
 });
@@ -816,15 +816,15 @@ export const vModelWithOneOfEnum = v.union([
         ])
     }),
     v.object({
-        content: v.pipe(v.string(), v.isoDateTime()),
+        content: v.pipe(v.string(), v.isoTimestamp()),
         foo: v.picklist([
             'Quux'
         ])
     }),
     v.object({
         content: v.tuple([
-            v.pipe(v.string(), v.isoDateTime()),
-            v.pipe(v.string(), v.isoDateTime())
+            v.pipe(v.string(), v.isoTimestamp()),
+            v.pipe(v.string(), v.isoTimestamp())
         ]),
         foo: v.picklist([
             'Corge'
diff --git a/packages/openapi-ts-tests/test/__snapshots__/3.1.x/plugins/valibot/default/valibot.gen.ts b/packages/openapi-ts-tests/test/__snapshots__/3.1.x/plugins/valibot/default/valibot.gen.ts
index 2af8502dc..7b6038462 100644
--- a/packages/openapi-ts-tests/test/__snapshots__/3.1.x/plugins/valibot/default/valibot.gen.ts
+++ b/packages/openapi-ts-tests/test/__snapshots__/3.1.x/plugins/valibot/default/valibot.gen.ts
@@ -686,7 +686,7 @@ export const vModelWithPattern = v.object({
     key: v.pipe(v.string(), v.maxLength(64), v.regex(/^[a-zA-Z0-9_]*$/)),
     name: v.pipe(v.string(), v.maxLength(255)),
     enabled: v.optional(v.pipe(v.boolean(), v.readonly())),
-    modified: v.optional(v.pipe(v.pipe(v.string(), v.isoDateTime()), v.readonly())),
+    modified: v.optional(v.pipe(v.pipe(v.string(), v.isoTimestamp()), v.readonly())),
     id: v.optional(v.pipe(v.string(), v.regex(/^\d{2}-\d{3}-\d{4}$/))),
     text: v.optional(v.pipe(v.string(), v.regex(/^\w+$/))),
     patternWithSingleQuotes: v.optional(v.pipe(v.string(), v.regex(/^[a-zA-Z0-9']*$/))),
@@ -696,8 +696,8 @@ export const vModelWithPattern = v.object({
 
 export const vFile = v.object({
     id: v.optional(v.pipe(v.pipe(v.string(), v.minLength(1)), v.readonly())),
-    updated_at: v.optional(v.pipe(v.pipe(v.string(), v.isoDateTime()), v.readonly())),
-    created_at: v.optional(v.pipe(v.pipe(v.string(), v.isoDateTime()), v.readonly())),
+    updated_at: v.optional(v.pipe(v.pipe(v.string(), v.isoTimestamp()), v.readonly())),
+    created_at: v.optional(v.pipe(v.pipe(v.string(), v.isoTimestamp()), v.readonly())),
     mime: v.pipe(v.string(), v.minLength(1), v.maxLength(24)),
     file: v.optional(v.pipe(v.pipe(v.string(), v.url()), v.readonly()))
 });
@@ -807,14 +807,14 @@ export const vModelWithOneOfEnum = v.union([
         ])
     }),
     v.object({
-        content: v.pipe(v.string(), v.isoDateTime()),
+        content: v.pipe(v.string(), v.isoTimestamp()),
         foo: v.picklist([
             'Quux'
         ])
     }),
     v.object({
         content: v.tuple([
-            v.pipe(v.string(), v.isoDateTime()),
+            v.pipe(v.string(), v.isoTimestamp()),
             v.string()
         ]),
         foo: v.picklist([
diff --git a/packages/openapi-ts-tests/test/__snapshots__/3.1.x/validators-metadata/valibot.gen.ts b/packages/openapi-ts-tests/test/__snapshots__/3.1.x/validators-metadata/valibot.gen.ts
index 735206c81..1b6474b87 100644
--- a/packages/openapi-ts-tests/test/__snapshots__/3.1.x/validators-metadata/valibot.gen.ts
+++ b/packages/openapi-ts-tests/test/__snapshots__/3.1.x/validators-metadata/valibot.gen.ts
@@ -54,6 +54,6 @@ export const vPatchFooParameterBaz = v.object({
 
 export const vPatchFooParameterQux = v.pipe(v.string(), v.isoDate());
 
-export const vPatchFooParameterQuux = v.pipe(v.string(), v.isoDateTime());
+export const vPatchFooParameterQuux = v.pipe(v.string(), v.isoTimestamp());
 
 export const vPostFooData = vFoo3;
\ No newline at end of file
diff --git a/packages/openapi-ts-tests/test/__snapshots__/3.1.x/validators/valibot.gen.ts b/packages/openapi-ts-tests/test/__snapshots__/3.1.x/validators/valibot.gen.ts
index 735206c81..1b6474b87 100644
--- a/packages/openapi-ts-tests/test/__snapshots__/3.1.x/validators/valibot.gen.ts
+++ b/packages/openapi-ts-tests/test/__snapshots__/3.1.x/validators/valibot.gen.ts
@@ -54,6 +54,6 @@ export const vPatchFooParameterBaz = v.object({
 
 export const vPatchFooParameterQux = v.pipe(v.string(), v.isoDate());
 
-export const vPatchFooParameterQuux = v.pipe(v.string(), v.isoDateTime());
+export const vPatchFooParameterQuux = v.pipe(v.string(), v.isoTimestamp());
 
 export const vPostFooData = vFoo3;
\ No newline at end of file
diff --git a/packages/openapi-ts/src/plugins/valibot/plugin.ts b/packages/openapi-ts/src/plugins/valibot/plugin.ts
index fa63a718e..1f0cd6a92 100644
--- a/packages/openapi-ts/src/plugins/valibot/plugin.ts
+++ b/packages/openapi-ts/src/plugins/valibot/plugin.ts
@@ -542,7 +542,7 @@ const stringTypeToValibotSchema = ({
           compiler.callExpression({
             functionName: compiler.propertyAccessExpression({
               expression: identifiers.v,
-              name: identifiers.actions.isoDateTime,
+              name: identifiers.actions.isoTimestamp,
             }),
           }),
         );