How do I find the manufacturing date of my Nexus 5?

Re: Manufacturing date of my nexus 5

Are you looking on the box or ur phone for serial number? Because they don't match it goes by the serial number written on ur phone box

That's dumb. I'm looking in the settings. Why wouldn't the two match?
 
Re: Manufacturing Date of the Nexus5X

First three numbers of the serial number. The first number is the last digit of the year and the next two are the month.

My phone is a warranted replacement, so I am not sure about my box since I have a few of them. The IMEI number (seen on the screen which does agree with the sticker on the back) and the serial number (seen on the screen) do not help. Any other thoughts on finding out the date? (next I will look at my e-mail trace)
 
Re: Manufacturing Date of the Nexus5X

Well, I am out of luck. I can not find my e-mail trace. Looking at my Google Purchase history it tells me Sept 2016 which I presume was the original phone (not my replacement phone).
 
Re: Manufacturing Date of the Nexus5X

I did find the e-mail, Sept 2016 was indeed the replacement phone (but of course I don't know when that phone was manufactured).