Resolve daylight-saving gaps and repeated local times
A recurring appointment lands in a nonexistent local hour during a timezone transition.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Time zones
Estimated field mix
- Backend60%
- Integrations40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional booking service supports consultants in multiple time zones. Recurring events, revoked access, and delayed callbacks cause missed conflicts.
Setup prerequisites
- Author synthetic calendars and a local provider double with recurrence, timezone, and access-revocation cases.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Define explicit gap and overlap policies.
- Keep original local time and selected offset.
- Return ambiguity when policy cannot resolve the occurrence.
Implementation constraints
- Use a maintained timezone database available locally.
Verification to include
- Exercise a spring gap and autumn repeated hour.
- Reject a silently guessed offset.
Deliverables
- Timezone resolution tests.
Rollout and recovery
Keep affected appointments unresolved until policy is applied.
Value of the work
For the engineer: Practice temporal modeling, synchronization lifecycles, and privacy-preserving projections.
For the team: Reduce scheduling ambiguity through explicit availability contracts and recoverable synchronization.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.