Use DateTimeOffset for instants that cross system boundaries
Use DateTimeOffset for timestamps sent through APIs, messages, or storage when they must identify one unambiguous point in time.
Distributed-Systems
Design queue handlers for duplicate delivery
Assume a queue message can arrive more than once and make the handler’s business effects safe to repeat.
Use idempotency keys for retryable writes
Make a retried write replay the same operation instead of creating a duplicate side effect.