Does any event capture JIT timestamp in .NET?

I am looking for a way to record the last JIT of my web application. Sort of an automatic "last updated" for the assemblies. Any suggestions?

2010-09-02T08:37:50Z

The point is to have some tool to track if a change was made only relative to the last update so time accuracy isn't particularly important. Either when it was last built OR JITted would work for my purposes. Thanks.

Pfo2010-09-02T08:28:40Z

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You can look at file times, but those could be wrong. JIT compilation happens at runtime, are you talking about when the assemblies were last built?