In server form field, under "Software Installations", Install Date field is empty.
For Linux machines, the software installed information is being pulled the probe: "Linux - Installed Software". This will not get "Install Date" information.
This will only pull Sofware Name, Version and Vendor(Publisher) details.
software.name = this.name;
software.version = this.version;
software.vendor = this.maintainer;
However, for Windows machines, the install date field of the software is being fetched from windows registry:
The client might have to raise an enhancement request for the same.