#399

frontend/src/components/PostOriginalCreatedTimeField.test.tsx

@@ -46,20 +46,37 @@ describe ('PostOriginalCreatedTimeField', () => {
 	.toBe (60_000)
   })
 
-  it ('normalises second-bearing values to minute precision', () => {
+  it ('does not rewrite mounted values that only differ by offset notation', () => {
     const setFrom = vi.fn ()
     const setBefore = vi.fn ()
 
     render (
         <PostOriginalCreatedTimeField
-            originalCreatedFrom="2026-01-01T00:00:05Z"
+            originalCreatedFrom="2024-01-01T12:34+09:00"
             setOriginalCreatedFrom={setFrom}
-            originalCreatedBefore="2026-01-02T00:00:00.123Z"
+            originalCreatedBefore="2024-01-01T12:35+09:00"
             setOriginalCreatedBefore={setBefore}/>,
     )
 
-    expect (setFrom).toHaveBeenCalledWith ('2026-01-01T00:00Z')
-    expect (setBefore).toHaveBeenCalledWith ('2026-01-02T00:00Z')
+    expect (setFrom).not.toHaveBeenCalled ()
+    expect (setBefore).not.toHaveBeenCalled ()
+  })
+
+  it ('emits minute-precision UTC values only when the user edits the input', () => {
+    const setFrom = vi.fn ()
+
+    render (
+        <PostOriginalCreatedTimeField
+            originalCreatedFrom="2024-01-01T12:34+09:00"
+            setOriginalCreatedFrom={setFrom}
+            originalCreatedBefore={null}
+            setOriginalCreatedBefore={vi.fn ()}/>,
+    )
+
+    const input = screen.getDisplayValue ('2024-01-01T12:34')
+    fireEvent.change (input, { target: { value: '2024-01-01T12:35' } })
+
+    expect (setFrom).toHaveBeenCalledWith ('2024-01-01T03:35Z')
   })
 
   it ('resets both values', () => {