How to Troubleshoot an API Integration That Sends Dates One Day Off

Date values can shift by one day when one system treats a date as local time and another converts it to UTC. Daylight-saving transitions and timestamps without timezone information make the mismatch harder to detect.

What to check

Inspect raw request and response values, timezone offsets, serialization format, database column type, and locale assumptions. Test dates near midnight and daylight-saving changes across both systems.

Recommended next step

Use explicit timezone-aware timestamps or date-only types according to the business meaning. Document conversion rules and add regression cases for boundary dates.

How Informatix Systems can help

Informatix Systems provides custom software and API integration services. We can assess the affected setup, trace dependencies, and help plan a practical improvement. Contact us with the platform involved, when the issue began, and non-sensitive error details.