# Code Review R003 — Step 1

**Verdict:** APPROVE

No blocking findings. The shared `internal/response` helper derives `as_of`, `as_of_date`, `as_of_weekday`, and `timezone` from one localized instant, preserves the prior invalid-timezone error behavior, and reports the actual trimmed/defaulted zone used for localization.

Tests run:

- `go test ./internal/response ./internal/tools`
