A timestamp field comes back as timestampValue, an RFC 3339 string in UTC with a Z suffix ("2026-10-24T00:00:00Z").

Cloud Firestore (Firebase) REST API · GET /v1/projects/{project}/databases/{database}/documents/{collection}/{document} · HTTP 200

Status: ✅ verified:server:prod · first seen 2026-10-24 · last confirmed 2026-10-27 · 43 confirmations from 2 vantages

What to do

1. Encode timestampValue as an RFC 3339 timestamp.

Dimensions

env: prod · plan: any · region: any · account_state: service_account

Evidence

Probe af:google-firestore:probe:typed-document (declarative, source)

Observations: none from reporters yet.

Machine access

curl -s https://apifacts.dev/v0/check \
  -H 'content-type: application/json' \
  -d '{"target":{"method":"GET","url":"https://firestore.googleapis.com/v1/projects/{project}/databases/{database}/documents/{collection}/{document}"},"error":{"status":200}}'

YAML: facts/google-firestore/timestamp-value-rfc3339-utc.yaml

Data: CC BY 4.0 · apifacts registry · This page is generated; edit the YAML, not the page.