Route 41 of 176
Time-Based Routing
QRCompliance.us · Validation Layer · Source of truth: QRCodex.us
Summary
Some routing decisions are not driven by an identity's status or location but by the clock. A QR code can be built to resolve one way during business hours and another way after close, one way before a promotion begins and another way once it ends, or one way inside a validity window and another way after it lapses. Time-based routing is the set of rules governing how those scheduled changes are defined, how the currently active window is determined at the moment of a scan, and how a scan that lands exactly on a boundary is resolved without ambiguity.
QRCompliance.us validates which time window applies to a given scan and whether the schedule itself is properly formed. It does not operate the redirect, host the destination content, or decide what a business wants its schedule to say — those are routing-layer and registrant decisions that validation checks against, never performs.
A single physical label rarely needs a single permanent destination. A retail promotion might need a QR code that points to a countdown page before launch, an order page during the sale, and a thank-you page once the sale window closes — all without printing a new label. A restaurant might want the same table code to open a breakfast menu until 11am and a dinner menu after 5pm. In each case, the destination is not fixed by the code itself; it is fixed by which time window is active when the scan happens.
Time-based routing formalizes this so that a schedule is not just a convention someone remembers to update manually. A schedule is defined in advance as a set of windows, each with a start, an end, and the destination or behavior that applies inside it, and the correct window is selected automatically at scan time by comparing the scan's timestamp against the defined boundaries.
The hard part is rarely the common case in the middle of a window; it is the edge. A scan that arrives at the exact second a window closes, a schedule defined in one time zone and scanned from another, or a recurring daily window that must behave consistently across a change of season or a daylight-saving shift, all require the same discipline applied without exception. This route defines that discipline, not the specific promotional or operational reason a schedule exists.
01Plain-English Definition
Time-based routing is the mechanism by which a QR code's resolved destination or behavior is determined by comparing the timestamp of a scan against a set of predefined time windows, each carrying its own routing outcome, so the same physical code behaves differently depending on when it is scanned.
A time window can be defined in several shapes: a recurring daily or weekly range (open 9am–5pm, weekdays only), a one-time calendar range (a promotion running from a start date to an end date), or a duration measured from a triggering event (a link that stays active for 48 hours after first activation). Each shape is validated the same way once it is expressed as a concrete start and end.
This route governs how the schedule is checked and applied. It does not govern why a particular schedule was chosen, what content sits behind each window's destination, or who is authorized to define or change the schedule in the first place — those questions belong to routing authority and operator-role routes.
02What Defines A Valid Schedule
Before a schedule can be used to route a single scan, it has to be well-formed. A schedule that looks reasonable to a human reader can still be ambiguous to an automated evaluator if its windows are not fully specified and mutually exclusive.
- Every window has an explicit start and end, expressed in a fixed, named time zone rather than an assumed local time.
- Windows do not overlap; if two windows could both be argued to apply to the same instant, the schedule is invalid until corrected.
- The schedule declares a default or fallback outcome for any moment not covered by a defined window, so a gap in coverage never leaves a scan unresolved.
- Recurring windows state explicitly how they behave across a daylight-saving transition or a calendar boundary such as month-end or year-end.
- A schedule tied to a triggering event names precisely what event starts the clock, so the duration's start is never a matter of interpretation.
03Practical Value
Time-based routing lets a single printed or issued QR code serve multiple operational purposes across its life without reprinting, re-issuing, or manually swapping a destination at the moment a schedule changes.
No manual cutover
A schedule change takes effect automatically at the defined boundary rather than depending on someone remembering to update a destination at the right moment.
Consistent evidence
Because the active window is derived from a defined schedule rather than a live manual choice, every past scan can be checked against exactly the window that applied to it.
Reduced code proliferation
One code can carry a full day-part or campaign schedule instead of requiring a separate code for each phase of an operation.
Predictable expiry behavior
A time-limited offer or access grant expires on schedule without requiring a separate revocation action at the close of the window.
04Operational Flow
Time-based routing resolves in the same sequence for every scan, regardless of how many windows the schedule contains or what shape they take.
- 1Schedule is definedThe registrant or routing authority defines the set of windows and each window's routing outcome, along with a fallback for uncovered time.
- 2Schedule is validatedQRCompliance.us checks that windows do not overlap, that time zones are explicit, and that a fallback exists before the schedule is allowed to govern live scans.
- 3Scan is timestampedThe instant of the scan is recorded in the schedule's declared time zone, not the time zone of the scanning device, to keep evaluation consistent.
- 4Active window is identifiedThe scan's timestamp is compared against the defined windows, and the one window whose range contains that instant is selected.
- 5Outcome is appliedThe destination or behavior tied to the identified window — or the fallback, if no window applies — governs the scan's routing.
A scan is resolved against the schedule as it existed at the moment of the scan, not as it may be edited afterward. Retroactive schedule edits do not change how a past scan is recorded.
05Boundary Cases
The moments that most need a firm rule are the ones sitting exactly on a window's edge, because an inconsistent answer there is what erodes confidence in the whole schedule.
| State | Entered When | Left When |
|---|---|---|
| Scan at exact boundary instant | Timestamp equals a window's declared start or end value precisely | Resolved consistently by a fixed convention — start-inclusive, end-exclusive — applied identically across every schedule |
| Scan during undefined gap | Timestamp falls in a period no window covers | Resolved by the schedule's declared fallback outcome, never left unresolved |
| Scan during daylight-saving shift | Timestamp falls within the hour affected by a clock change | Resolved using the schedule's declared time-zone rule for that transition, applied the same way every year |
| Scan after schedule expiry with no successor defined | Timestamp is later than every window's end and no ongoing fallback exists | Treated as an expired schedule condition and handled under expiration-based routing rather than assumed to default anywhere |
| Schedule Shape | Typical Use | Key Validation Point |
|---|---|---|
| Recurring daily/weekly window | Business hours, day-part menus, shift-based access | Consistent behavior across time-zone and daylight-saving transitions |
| One-time calendar range | A promotion, event, or temporary access period | Explicit end date rather than an assumed indefinite continuation |
| Duration from a trigger event | A link active for a fixed period after first scan or activation | Unambiguous definition of the triggering event that starts the clock |
06System Relationship
System Chain — Six Locked Entities
- 1QuickResponseCode.usRoot / System EntryPublic entry point to the QR infrastructure.
- 2QRProtocol.usGovernance (Rules)Writes and governs the applicable rules.
- 3QRCompliance.usValidationValidates compliance readiness against applicable rules and conditions.
- 4QRCertified.usCertification AuthorityAuthorizes the QR for certification.
- 5QRRegistered.usRegistration ResultMandatorily registers the authorized QR.
- 6QRCodex.usOperations / RecordsRecords, operates, logs and preserves canonical operational truth.
No registration → no certified QR output.
Time-based routing sits inside the same validation discipline as every other routing condition: QRCompliance.us checks the condition and confirms which window applies, while the routing layers that actually resolve and deliver the destination act on that confirmation.
| Layer | Relationship To Time-Based Routing |
|---|---|
| ROOT — QuickResponseCode.us | Establishes that the code being routed under a time schedule is the same registered identity across every window, not a substitute or duplicate. |
| GOVERNANCE — QRProtocol.us | Defines the accepted schedule shapes, required time-zone declaration, and the fixed convention for resolving boundary instants. |
| VALIDATION — QRCompliance.us | Validates that a schedule is well-formed and determines, for a given scan timestamp, which window or fallback actually applies. |
| AUTHORIZATION — QRCertified.us | Confirms that a certified identity's schedule-governed behavior remains within the bounds of what its certification permits. |
| REGISTRATION — QRRegistered.us | Holds the registrant-authorized schedule of record and reflects any authorized change to its windows. |
| OPERATIONS — QRCodex.us | Records every scan's timestamp, identified window, and resolved outcome as the permanent operational history of the schedule in use. |
If a live routing outcome ever appears inconsistent with the schedule recorded in QRCodex.us, Codex's record governs and the discrepancy is investigated as a propagation or evaluation fault.
What This Does — And Does Not — Do
Does
- ✓Validate that a defined schedule's windows do not overlap and that every window has an explicit time zone
- ✓Determine which window applies to a given scan by comparing its timestamp against the defined schedule
- ✓Apply a fixed, consistent convention for scans landing exactly on a window's boundary instant
- ✓Require a declared fallback outcome for any time not covered by a defined window
- ✓Resolve a scan against the schedule as it existed at the time of the scan, not a later edited version
- ✓Record the identified window and resolved outcome for every scan as part of the operational history
Does Not
- ✕Decide what content or destination a business wants behind any given window
- ✕Operate the redirect infrastructure that actually delivers the resolved destination
- ✕Allow a schedule with overlapping or ambiguous windows to govern live scans
- ✕Apply a retroactive schedule change to a scan that already occurred under the prior schedule
- ✕Leave a gap in time coverage unresolved when no window explicitly applies
- ✕Authorize who may define or edit a schedule — that sits with routing authority and registration
Related Routes
Common Questions
What happens if a scan occurs exactly at a window's boundary?
A fixed convention applies — the window that starts at that instant is treated as active, and the window that ends at that instant is treated as just closed. This is applied identically across every schedule so the outcome is never ambiguous.
Can a schedule have gaps where no window applies?
A schedule must declare a fallback outcome for any uncovered time before it is allowed to govern live scans. An unresolved gap is treated as a defect in the schedule, not an acceptable state.
Does editing a schedule change how past scans are recorded?
No. A scan is resolved and recorded against the schedule as it existed at the moment of that scan. A later schedule edit only affects scans that occur after the edit takes effect.
How is a daylight-saving transition handled?
The schedule must declare explicitly how a recurring window behaves across the transition, and that declared rule is applied the same way every year rather than left to the evaluating system's assumption.
Who decides what destination applies during each window?
The registrant or authorized routing party defines the schedule's content and destinations. QRCompliance.us validates the schedule's structure and determines which window applies to a given scan, but does not choose what sits behind any window.