Software-Inventory reports NO installation date for some applications

Software-Inventory reports NO installation date for some applications

I need to know the installation date for applications I deploy using desktop central, because I have to make statistics showing how long (how many days) it takes to deploy a patch to all client machines.

For Java and for Adobe reader, software inventory shows me an installation date - fine.
BUT for Adobe Flash Player (both FF plugin and IE activex) and for Mozilla Firefox, DC's software inventory only shows me "--".

And this is not a windows bug, because Windows "programs and features" control panel shows me an install date for Flash and Firefox.

By the way, we are using the newest DC version build 90023







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