How current is my source tree?

[Thorsten Glaser <mirabilos@ecce.homeip.net>]

Hello, experts,

assume the following scenario:
I update my /usr/src tree, for example by anoncvs or
CVSup in checkout mode.
Then I want to know what `date` the time of the last
commit in the checked-out repository is, because for
example I want to record a certain time before which
any commits are included and none after.

Is there an easy way to get it, or do I have to remind
the mail of source-changes@ and look which is the last
I got?

Can I examine the supfile somehow to get this info?

Thanks in advance, excuse if I disturbed you.
-mirabilos
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