[amitbardos]

Answers two review questions on @base44/platform/react 0.5.0.

1. createdAt formats

ChatItem.createdAt passed Base44's created_date through with no zone, so new Date() read it as local time. A pending prompt's createdAt ended in Z. Outside UTC the two disagreed, and Base44's times showed off by the offset.

toItems now gives every timestamp its Z, in the pending prompt's shape (2026-10-25T11:00:00.000Z). Only ISO date-times are touched, because new Date() guesses at other shapes ("1Z" parses as 2001). The docs caveat is gone.

Breaking: anyone who appended a Z themselves now gets …ZZ. Noted in the changelog.

2. "Resolve once Base44 accepts the request"

Send chat message and Submit tool-call input stay open until the turn ends, and nothing answers "accepted" before that. A backend that awaited them got a rejection whenever a server timeout hit mid-turn. The hook then dropped the prompt, reopened the question and showed an error for a turn that was still running.

The hook now reads acceptance from the live updates:

• Prompt: Base44's copy of it arrives.
• Answer, or the auto-decline of an unknown kind: the tool call stops waiting.

send() and the answer actions resolve at that point. A backend failure after it doesn't set error, drop the prompt or reopen the question. A refusal before it behaves as before.

ChatBackend's docs now say to forward the request and return its result. They also say that a Next.js server action shouldn't wait out the turn, because server actions run one at a time.

Checked live (Tiny Sunny dev workspace)

Check	Result
Refusals	404 in 0.3s, 401 in 0.4s
created_date	2026-10-25T13:42:11.682000, no zone
Caller aborts Send chat message after 8s	The turn still finished: a disconnect doesn't cancel it
Send while the AI is busy	200 {"queued": true} in 0.4s, so a queued prompt needs no special handling

Tests

• New unit tests for the timestamp helper and for a late failure after Base44's copy arrived, after an answer was taken, and after a decline was taken.
• tsc, type tests, eslint and all 160 unit tests pass.

🤖 Generated with Claude Code

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🚀 Package Preview Available!

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Install this PR's preview build with npm:

npm i @base44-preview/sdk@0.8.57-pr.354.eeb83f0

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npm i "@base44/sdk@npm:@base44-preview/sdk@0.8.57-pr.354.eeb83f0"

Or add it to your package.json dependencies:

{
  "dependencies": {
    "@base44/sdk": "npm:@base44-preview/sdk@0.8.57-pr.354.eeb83f0"
  }
}

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