From a7eccf3cf463b69c8a1d1fb44895ea8960a2db68 Mon Sep 17 00:00:00 2001
From: Wonsuk Choi <sukvvon@gmail.com>
Date: Thu, 28 May 2026 11:11:50 +0900
Subject: [PATCH] fix(query-devtools/utils): make 'last updated' sort return 0
 for queries with equal 'dataUpdatedAt' to follow the standard comparator
 contract

---
 .changeset/devtools-date-sort-equal-timestamps.md   | 5 +++++
 packages/query-devtools/src/__tests__/utils.test.ts | 7 +++++++
 packages/query-devtools/src/utils.tsx               | 6 ++++--
 3 files changed, 16 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/devtools-date-sort-equal-timestamps.md

diff --git a/.changeset/devtools-date-sort-equal-timestamps.md b/.changeset/devtools-date-sort-equal-timestamps.md
new file mode 100644
index 0000000000..226fbbc7bc
--- /dev/null
+++ b/.changeset/devtools-date-sort-equal-timestamps.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/query-devtools': patch
+---
+
+fix(query-devtools/utils): make 'last updated' sort return 0 for queries with equal 'dataUpdatedAt' to follow the standard comparator contract
diff --git a/packages/query-devtools/src/__tests__/utils.test.ts b/packages/query-devtools/src/__tests__/utils.test.ts
index 511553e2bb..688a87654e 100644
--- a/packages/query-devtools/src/__tests__/utils.test.ts
+++ b/packages/query-devtools/src/__tests__/utils.test.ts
@@ -1076,6 +1076,13 @@ describe('Utils tests', () => {
         expect(dateSort(older, newer)).toBe(1)
         expect(dateSort(newer, older)).toBe(-1)
       })
+
+      it('should return 0 when both queries share the same "dataUpdatedAt"', () => {
+        const a = buildQuery(['a'], { dataUpdatedAt: 100 })
+        const b = buildQuery(['b'], { dataUpdatedAt: 100 })
+
+        expect(dateSort(a, b)).toBe(0)
+      })
     })
 
     describe("'query hash'", () => {
diff --git a/packages/query-devtools/src/utils.tsx b/packages/query-devtools/src/utils.tsx
index 5306f2cf5f..4a23b15757 100644
--- a/packages/query-devtools/src/utils.tsx
+++ b/packages/query-devtools/src/utils.tsx
@@ -101,8 +101,10 @@ const getStatusRank = (q: Query) =>
 
 const queryHashSort: SortFn = (a, b) => a.queryHash.localeCompare(b.queryHash)
 
-const dateSort: SortFn = (a, b) =>
-  a.state.dataUpdatedAt < b.state.dataUpdatedAt ? 1 : -1
+const dateSort: SortFn = (a, b) => {
+  const diff = b.state.dataUpdatedAt - a.state.dataUpdatedAt
+  return diff < 0 ? -1 : diff > 0 ? 1 : 0
+}
 
 const statusAndDateSort: SortFn = (a, b) => {
   if (getStatusRank(a) === getStatusRank(b)) {