Please see the attached documents, these will show you what information is available on a tractor unit and how to read it.
Please note: This does not cover every machine, there are some older tractots that do not use this method. There are also some newer models that use an A0 number that doesnt include the date.
You can type this serial number into the warranty screen on SOLARIS and it will bring up the date of manufacture.
120833: 1994 - 2012
120834 2012 - Current