How to tell the age of my HP Proliant DL380 G7 and DL360 G8 servers from serial number

Hi

I just took over a new job and we have 5 servers that I am trying to figure out the age of as they are critical production servers.

Is there a way to tell how old a server is by its serial number?

HP DL380G7 E5620 Base AP Svr                       Confidential Info Erased

HP DL380G7 X5690 HPM US Svr                        -

HP DL380G7 SFF CTO Server                               -

HP DL360p Gen8 S-Buy E5-2609 Etry US Svr     -

HP S-Buy DL380G7 X5680 SFF US Svr                -

Any help would be greatly appreciated