Records needed for this question
Timestamped usage, timezone rules and cycle boundary definitions.
How to investigate
Convert boundary events once, retaining their original timestamps, then reconcile the carrier's date convention.
An illustrative review decision
A usage event close to midnight may move between billing days after timezone conversion. Establish the carrier's contractual clock before deciding that the event falls outside a plan or service period.
What can lead to the wrong conclusion?
Daylight-saving changes can create repeated local times without duplicated usage.
The result to retain
A reproducible boundary-event allocation.
Apply the review in context
Review carrier invoice evidence, inventory, findings and recovery cases in AuditRes Telecom.
This guide describes a human review method, not a claim that every scenario is automatically detected or executed. Explore AuditRes Telecom.