From aefb2659ecd1e7c684c98bafbb64da81d9905d06 Mon Sep 17 00:00:00 2001
From: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com>
Date: Tue, 23 Nov 2021 15:28:18 +0100
Subject: [PATCH] Tracing: Show start time of trace with milliseconds precision
 (#42132)

* Tracing header: Add setting to show start time with ms

* Add test

* Update test
---
 .../src/TracePageHeader/TracePageHeader.test.js              | 5 +++++
 .../src/TracePageHeader/TracePageHeader.tsx                  | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/jaeger-ui-components/src/TracePageHeader/TracePageHeader.test.js b/packages/jaeger-ui-components/src/TracePageHeader/TracePageHeader.test.js
index d4ba4132d82..e455fa1f360 100644
--- a/packages/jaeger-ui-components/src/TracePageHeader/TracePageHeader.test.js
+++ b/packages/jaeger-ui-components/src/TracePageHeader/TracePageHeader.test.js
@@ -60,6 +60,11 @@ describe('<TracePageHeader>', () => {
     });
   });
 
+  it('renders start time in header with millisecond precision', () => {
+    const startTimeMs = wrapper.find(LabeledList).props().items[0].value.props.children[1].props.children;
+    expect(startTimeMs).toMatch(/:\d\d\.\d\d\d/g);
+  });
+
   it('renders a <SpanGraph>', () => {
     expect(wrapper.find(SpanGraph).length).toBe(1);
   });
diff --git a/packages/jaeger-ui-components/src/TracePageHeader/TracePageHeader.tsx b/packages/jaeger-ui-components/src/TracePageHeader/TracePageHeader.tsx
index f1c69988e20..1e39a259fad 100644
--- a/packages/jaeger-ui-components/src/TracePageHeader/TracePageHeader.tsx
+++ b/packages/jaeger-ui-components/src/TracePageHeader/TracePageHeader.tsx
@@ -167,7 +167,7 @@ export const HEADER_ITEMS = [
     label: 'Trace Start',
     renderer(trace: Trace, timeZone: TimeZone, styles: ReturnType<typeof getStyles>) {
       // Convert date from micro to milli seconds
-      const dateStr = dateTimeFormat(trace.startTime / 1000, { timeZone });
+      const dateStr = dateTimeFormat(trace.startTime / 1000, { timeZone, defaultWithMS: true });
       const match = dateStr.match(/^(.+)(:\d\d\.\d+)$/);
       return match ? (
         <span className={styles.TracePageHeaderOverviewItemValue}>