{
  "benchmark_id": "CAL-BENCH-001",
  "version": "1.2.0",
  "date": "2026-10-01",
  "description": "Validation test vectors for civil day midnight transition under UTC+7 and UTC+0",
  "vectors": [
    {
      "test_id": "CAL-R001-T01",
      "timestamp_utc_ms": 1790870399000,
      "iso_utc": "2026-09-30T23:59:59.000Z",
      "timezone_offset_minutes": 420,
      "expected_local_iso": "2026-10-01T06:59:59.000+07:00",
      "expected_civil_date": "2026-10-01",
      "rule": "CAL-R001"
    },
    {
      "test_id": "CAL-R001-T02",
      "timestamp_utc_ms": 1790812799999,
      "iso_utc": "2026-09-30T07:59:59.999Z",
      "timezone_offset_minutes": 420,
      "expected_local_iso": "2026-09-30T14:59:59.999+07:00",
      "expected_civil_date": "2026-09-30",
      "rule": "CAL-R001"
    },
    {
      "test_id": "CAL-R001-T03",
      "timestamp_utc_ms": 1790874000000,
      "iso_utc": "2026-10-01T01:00:00.000Z",
      "timezone_offset_minutes": 420,
      "expected_local_iso": "2026-10-01T08:00:00.000+07:00",
      "expected_civil_date": "2026-10-01",
      "rule": "CAL-R001"
    }
  ]
}