Interpretation
For each recorded event, compute UTC = recorded wall time − declared UTC offset. The plausible interval is UTC ± measured or documented maximum clock/time uncertainty. Overlapping intervals show only that the two event times could coincide within those bounds, not that the records describe the same action, originate independently, or involve the same actor.
When not to use this calculator
Do not use symmetric uncertainty if the evidence has asymmetric processing delays, missing time-zone rules, ambiguous daylight-saving transitions, or stepwise clock corrections. Separate event-generation time from ingestion and display times; preserve raw source timestamps.
Related: forensic observability.