{
  "schema_version": "1.7.0",
  "id": "x_SHAPI-meta-graph-date-format-param-removed",
  "modified": "2026-10-31T01:21:14Z",
  "published": "2026-07-29T00:00:00Z",
  "summary": "date_format query parameter returns an error from 2026-10-27",
  "details": "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.\n\nRemove 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.",
  "affected": [
    {
      "ecosystem_specific": {
        "provider": "meta-graph",
        "endpoint": {
          "method": "*",
          "path": "/**"
        },
        "change_class": "version-sunset",
        "trigger": {
          "query": [
            {
              "name": "date_format"
            }
          ]
        },
        "effective_date": "2026-10-27"
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://developers.facebook.com/docs/graph-api/changelog/version26.0"
    }
  ],
  "database_specific": {
    "severity": "critical",
    "status": "verified",
    "url": "https://shapi.dev/osv/meta-graph-date-format-param-removed.json"
  }
}