Issue 32: add ISO8601 timestamp to date display title attribute

[WilliamZhang9]

Problem

#32

Solution

Add ISO8601 (UTC) formatted timestamp as a browser tooltip on all date displays (NOT only Last Indexed).

UI Verification

Before

After

Summary by CodeRabbit

• Improvements
  • Tooltip now displays exact ISO 8601 UTC timestamps for dates, giving precise machine-readable date-time details.
  • Visible on-screen date formatting and tooltip behavior remain unchanged to preserve the familiar display.

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Walkthrough

Replaced the long, locale-specific tooltip content with an ISO8601 string: iso8601Date = date.toISOString() is now used for tooltip/title; visible rendering still uses getFormattedDate(date). Removed previous formatFullDate usage. No exported/public API changes.

Changes

Cohort / File(s)	Summary
Date Display packages/web/src/app/[domain]/components/DisplayDate.tsx	Removed formatFullDate usage, added iso8601Date = date.toISOString() and used it for TooltipContent/element title; visible content remains getFormattedDate(date). No exported/public declaration changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: adding ISO8601 timestamp formatting to the date display's title attribute, directly addressing Issue 32.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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No actionable comments were generated in the recent review. 🎉

🧹 Recent nitpick comments

packages/web/src/app/[domain]/components/DisplayDate.tsx (1)

21-23: Consider showing both human-readable and ISO8601 dates in the tooltip.

The raw ISO string (2026-02-15T00:52:38.881Z) is useful for copying/debugging but harder to read at a glance. Adding a human-readable line above it (as was there before) would give users the best of both worlds.

💡 Suggested enhancement

                 <TooltipContent>
-                    <p>{iso8601Date}</p>
+                    <p>{date.toLocaleString("en-US", { dateStyle: "long", timeStyle: "medium", timeZone: "UTC" })} UTC</p>
+                    <p className="text-xs text-muted-foreground">{iso8601Date}</p>
                 </TooltipContent>

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Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@packages/web/src/app/`[domain]/components/DisplayDate.tsx:
- Line 29: Remove the native title attribute on the <span> (currently using
iso8601Date) to avoid the browser tooltip overlapping the Radix <Tooltip>;
instead, surface the ISO8601 string inside the existing TooltipContent (e.g. add
a secondary line or smaller text showing iso8601Date) within the DisplayDate
component so the TooltipTrigger/TooltipContent pair shows both the formatted
date and the raw ISO timestamp in one styled tooltip; update references to
iso8601Date, TooltipTrigger, TooltipContent and the span with className to
reflect the removal of title and the new content placement.