How can check my mobile date of manufacturing with s/n

[AC Question]

I have honor holly -u19. Its s/n is [S/N redacted by Mod] on back of mobile. [S/N redacted by Mod] in checking in setting.

 

[B. Diddy]

Welcome to Android Central! You're probably seeing the difference between the CSSN (which is the Serial Number reported in Settings>About Phone) and the SSN (which is the S/N on the box). I'm not sure what the difference is--interestingly, there's nothing official I can find on the web about this.

I edited out the serial numbers you had included in your post, in case that kind of information is sensitive. (I know the IMEI definitely is sensitive, just not sure about serial numbers.)