How can I find out the production week/date code of the ACJ5212?

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------Question for ACJ5212 Please Put your question below–

I have an ACJ5212 relay and am unable to verify if it was produced in 2020 or 2012.Could you please assist in confirming the production date / production period for this component?

ACJ5212
ACJ5212392×474 100 KB

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Hello @xinyuanchuangxin01
Welcome to DigiKey’s TechForum,

Four digit date code 2221 will follow as YYWW. This would be May of 2022.
Five digit date code 20521 will follow as YMMDD. this would also indicate May of 2022.

How to read a date code on a relay