date_format query parameter returns an error from 2026-10-27
- Provider
- Meta
- Endpoint
* /**- Effective
- 2026-10-27
- Severity
- critical
- Change
- version-sunset
- Status
- verified
What changed
Requests that include the legacy date_format parameter return an error on Graph API v26.0+ since 2026-07-29 and on all supported versions from 2026-10-27. The same change makes pretty and debug ignored and removes ETag/304 Not Modified behaviour.
What to do
Remove date_format from every Graph API request and parse the default ISO 8601 timestamps in your own code. While you are there, drop any reliance on If-None-Match/304 caching and on pretty or debug output.
Sources
- Provider notice (2026-07-29)
Check your code
bash
npx shapi-cli scan .shapi scan lists the call sites this change affects; shapi fix repairs them test-first when the advisory has an automatic fix. All advisories · Markdown · OSV · JSON