[wrangler] Fix running duration calculation in workflows instances describe

[Kuldeeep18]

Problem

When inspecting in-progress workflow instances, steps, or attempts (end == null) with wrangler workflows instances describe, the displayed Duration was distorted across non-UTC client timezones.

For example, a step that started 10 seconds ago displayed as running for:

• 7 hours in America/Los_Angeles (PDT)
• 4 hours in America/New_York (EDT)
• 5 hours in Asia/Kolkata (IST)
• 9 hours in Asia/Tokyo (JST)

Root Cause

In packages/wrangler/src/workflows/commands/instances/describe.ts, the current timestamp fallback for in-progress items was calculated as:

new Date(new Date().toUTCString().slice(0, -4))

Stripping " GMT" removed the timezone identifier. When passed to JavaScript's new Date(...), the string was parsed in the client's local timezone rather than UTC, shifting the epoch timestamp by the client's timezoneOffset.

In JavaScript, new Date() already represents the current instant in UTC epoch milliseconds, and new Date(start) (from an ISO 8601 UTC string) does as well. formatDistanceStrict calculates the difference between their .getTime() values, which are timezone-independent.

Solution

• Replaced new Date(new Date().toUTCString().slice(0, -4)) with new Date() across instance, step, and attempt duration calculations in describe.ts.
• Added a regression test in packages/wrangler/src/__tests__/workflows.test.ts asserting exact running step and attempt duration against mocked system time.
• Added a changeset for wrangler patch release.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal CLI display calculation fix for describe.

---

[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• .changeset/fix-workflows-describe-running-duration.md: [@cloudflare/wrangler]
• packages/wrangler/src/tests/workflows.test.ts: [@cloudflare/wrangler]
• packages/wrangler/src/workflows/commands/instances/describe.ts: [@cloudflare/wrangler]

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

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commit: 09e5eb2

[changeset-bot]

🦋 Changeset detected

Latest commit: 09e5eb2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
wrangler	Patch
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-plugin	Patch

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