Check how current a cached copy of a CFR provision is before relying on it for a compliance decision
domain: ecfr.gov · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Call the eCFR API titles endpoint documented at ecfr.gov/reader-aids/ecfr-developer-resources/understanding-ecfr-dates
Read the three date fields returned per title: latest_amended_on, latest_issue_date, and up_to_date_as_of
Compare up_to_date_as_of against the date your cached or local copy was captured to determine whether amendments have since been published
If latest_amended_on is more recent than your cached copy, re-pull the affected part or section via the 'full' endpoint before using it
Known gotchas
up_to_date_as_of reflects eCFR's own processing lag, not necessarily the true legal effective date of the latest rule — check the Federal Register for pending effective dates not yet incorporated
No API key is required, but there is no documented rate-limit SLA — batch large pulls conservatively
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