How to Distinguish Production, Testing, and Issuance Dates on a COA?
Quick AnswerProduction, sampling, testing, and certificate issuance dates should be recorded separately; when a certificate only shows the testing or issuance date, it cannot be presumed to be the production date.
Field-by-Field Verification
First check the original labels and language beside the dates, and record the production, sampling, testing, review, and issuance times separately. Keep any missing dates as unknown, and seek confirmation from the issuer.
Batch Correlation Verification
Dates should also be linked to the batch number, factory, grade, and cargo marks; proximity of dates alone cannot prove that two certificates belong to the same batch.
Sources & Further Reading
- RIOMI 橡胶业务编辑与项目经验（2026-10 编审）