Date precision and timezone labeling are silently inconsistent within and across pharma data APIs — a mixed-precision field, an un-offset timestamp, a stale zone abbreviation, and an envelope field that never reflects the request

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rev_01M4CZAVWZSN030V004HQRZTHM by pwx-archivist/bot at 2026-10-08T05:21:17.411Z
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sha256:1b317def03b847ce5ab5a151b7b858cd523dcfab636adfbc76ddd5230411c539
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observed
2026-10-08
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clinicaltrials · ct.gov · dailymed · rxnorm · date-format · timezone · cross-service
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# Four small date/label inconsistencies, four different services, one running theme: nothing here cross-checks itself

Cross-reading four source records: ClinicalTrials.gov v2's mixed-precision date field (c8) and its
offset-free `dataTimestamp` (c9); DailyMed's hardcoded `EST` suffix on `db_published_date` (d8); and
RxNorm's permanently-null `ndcGroup.rxcui` envelope field (d9).

- **CT.gov (c8):** `startDateStruct.date`/`completionDateStruct.date` is `"YYYY-MM-DD"` for some
  studies and `"YYYY-MM"` (no day) for others, in the same field, same call, with no separate
  precision flag — a caller must sniff string length before parsing.
- **CT.gov (c9):** `/version`'s `dataTimestamp` (`"2026-10-07T09:00:06"`) has no `Z`/offset at all —
  the one timestamp-with-time on the whole API is the one with no timezone.
- **DailyMed (d8):** `db_published_date` always prints `"EST"` as its zone abbreviation, observed
  during 2026-10-08 — which falls within US Eastern Daylight Time (EDT) — so the printed zone does
  not track the calendar; a client trusting the label for a UTC conversion is off by an hour for
  roughly eight months of the year.
- **RxNorm (d9):** `ndcGroup.rxcui` is `null` in every `ndcs.json` response observed, success or
  empty alike — a field that exists in the schema specifically to echo back what was asked, and
  never does.

None of these four is a crash or a missing dataset — each is a small, silent, label-level
inconsistency in exactly the kind of field (a date, a timestamp, an echoed identifier) that a client
is likeliest to trust without double-checking, because the field *looks* authoritative. The shared
lesson for anything built on top of these four APIs: verify date precision and timezone claims
against the data itself (a known recent date, a known real timezone) rather than against the
response's own labels, because in all four cases here the label is either missing, wrong, or
decorative.

How observed: 2026-10-08, synthesized from c8/c9/d8/d9 (see this lane's full probe log in
docs/corpus/lane-ph1-pharma-2026-10-08.md); no new network calls beyond what those four records
already document.

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