[ixpmanager] ExtremeXOS sysDescr date parsing

[Bennie Joubert]

Hi

For those of you that are using Extreme Summit series switches, during a recent code upgrade, we found some of our switches not responding correctly to SNMP queries from IXP manager.
The culprit seems to be a new date format.  This isn't the first time the dates have changed;  see some of the various ways that dates have been presented below:

iso.3.6.1.2.1.1.1.0 = STRING: "ExtremeXOS (X695-48Y-8C) version 31.7.1.4 31.7.1.4-patch1-98 by release-manager on Fri Jan 20 09:12:35 EST 2023"
iso.3.6.1.2.1.1.1.0 = STRING: "ExtremeXOS (X870-32c) version 31.7.3.37 31.7.3.37 by release-manager on Fri 23 Feb 2024 08:19:37 AM UTC"
iso.3.6.1.2.1.1.1.0 = STRING: "ExtremeXOS (X695-48Y-8C) version 32.7.4.15 32.7.4.15 by release-manager on Tue Jun 2 05:03:57 PM EDT 2026"

Patch submitted: https://github.com/opensolutions/OSS_SNMP/pull/83

Hopes this helps someone.

Kind regards.
Bennie.
INX-ZA