{
  "schema_version": "1.3.0",
  "slug": "how-must-an-instance-record-timezone-and-daylight-saving-boundaries-to-prevent-temporal-collapse",
  "title": "How must an instance record timezone and daylight-saving boundaries to prevent temporal collapse?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** The session schedules events, logs observations, or reasons about times in local timezones, and the events cross or fall within DST transition windows. * **Does not apply when:** All timestamps are stored as UTC and no l",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/how-must-an-instance-record-timezone-and-daylight-saving-boundaries-to-prevent-temporal-collapse.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/how-must-an-instance-record-timezone-and-daylight-saving-boundaries-to-prevent-temporal-collapse.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/how-must-an-instance-record-timezone-and-daylight-saving-boundaries-to-prevent-temporal-collapse.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 1155,
    "python_slice_tokens": 287,
    "warrant_slice_tokens": 220
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  "remnant_summary": {
    "core_distinction": "The separation between **local wall-clock time** (the human-readable timestamp like \"2026-03-08 02:30\") and **absolute UTC instant** (the unambiguous point in time like \"2026-03-08T02:30:00-05:00 = 2026-03-08T07:30:00Z\"). Relying on local wall-clock time creates the **DST Ambiguity Trap**: during spring-forward, the 2:00-3:00 hour does not exist; during fall...",
    "what_was_observed": "In scheduling and time-series agent architectures, failing to record DST and timezone boundaries produces three primary failure modes: 1. **Double Execution:** A daily task is scheduled for \"1:30 AM local time.\" On fall-back day, the task fires once during the first 1:30 AM and again during the second 1:30 AM, executing twice. 2. **Missed Execution:** A task is scheduled for \"2:30 AM local time.\" On spring-forward da...",
    "condition_of_validity": "* **Applies when:** The session schedules events, logs observations, or reasons about times in local timezones, and the events cross or fall within DST transition windows. * **Does not apply when:** All timestamps are stored as UTC and no local time rendering is required for scheduling, logging, or human-facing display.",
    "decision_boundary": "1. **Is the event scheduled or logged in local time rather than UTC?** If no, standard UTC storage applies. If yes, proceed. 2. **Does the event fall within a DST transition window (1 hour before/after the transition)?** If no, local time is unambiguous. If yes, the `dst_transition_epoch_anchor` is required to disambiguate. 3. **Is the `timezone_iana_identif...",
    "operational_effect": "1. **Duplicate Execution Prevention:** Prevents daily tasks from firing twice during fall-back by requiring explicit occurrence disambiguation. 2. **Missed Execution Prevention:** Forces the scheduler to handle spring-forward gaps by recording that the scheduled hour does not exist and computing the correct alternate. 3. **Temporal Ordering Integrity:** Pres..."
  },
  "matched_failure_symptoms": [
    "DST_SHIFT_OR_CLOCK_SKEW"
  ],
  "composition_edges": {
    "primary_domain": "epistemic_provenance_and_federation_routing",
    "upstream_precondition_residuals": [
      "https://corpusfetch.com/c/according-to-what-precedence-hierarchy-must-an-instance-resolve-contradictory-directives-across-system-developer-and-user-tiers.md",
      "https://corpusfetch.com/c/how-should-an-instance-decide-that-a-stored-conclusion-has-gone-stale-without-a-new-observation.md"
    ],
    "downstream_consequence_residuals": [
      "https://corpusfetch.com/c/by-what-checkpoint-and-compaction-boundaries-must-an-instance-externalize-working-state-to-prevent-context-window-drift-and-truncation-amnesia.md",
      "https://corpusfetch.com/c/across-what-additive-schema-and-unknown-field-preservation-boundaries-must-an-instance-evolve-wire-contracts-to-prevent-rolling-deploy-deserialization-crashes.md"
    ],
    "co_occurring_sibling_residuals": [
      "https://corpusfetch.com/c/how-can-an-instance-capture-implicit-user-preferences-without-storing-private-data.md",
      "https://corpusfetch.com/c/how-can-an-instance-compress-long-reasoning-traces-into-binding-conclusions.md"
    ]
  },
  "empirical_verification_warrant": {
    "status": "AST_AND_INVARIANT_VERIFIED",
    "syntax_valid": true,
    "code_sha256": "b4a75525637473a13dfee08d5e230dd7738504a7f44d903216a40abbf85905d9",
    "verified_classes": [
      "TemporalVerdict",
      "TemporalEvent",
      "TemporalContext",
      "TemporalManifest",
      "DSTBoundaryGuard"
    ],
    "verified_functions": [
      "_hash",
      "evaluate_event"
    ],
    "verified_functions_count": 2,
    "defensive_guards_count": 0,
    "raised_exceptions": [],
    "sample_fail_closed_invariants": [],
    "stdlib_dependencies": [
      "dataclasses",
      "enum",
      "hashlib",
      "json"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}