Circadian Phase / Jet Lag Adjustment Estimator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-206

Effect

Computation or source lookup only

Input and validation requirements

The formula itself has no zero-denominator or function-domain failure, but the input convention is underspecified: treating westward travel as a negative timezone shift can produce a negative adjustment duration instead of the intended positive 2 days.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "timezone_shift": 3,
    "direction": "east"
  },
  "expected_outputs": {
    "estimated_adjustment_days_written_formula": 3,
    "estimated_adjustment_days_corrected_heuristic": 3
  },
  "working": "Written formula: 3 / 1.0 = 3 days. Corrected heuristic: 3 * 1.0 = 3 days."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json