Can git ignore parts of files

I have kind of an odd problem that is causing me grief in git. I figure someone has a good solution here. (Or not, they will soon.)

I have a couple of kernel .config files that are checked into git. They are used to test kernel configurations for the nightly builds where I work.

We have a bunch of kernel developers working on drivers. When they add a new driver, they add in the options in the test file to make it compile in the test builds.

The problem is that the kernel config file has a timestamp at the top of the file that is generated by "make oldconfig" or "make config". Other than removing the timestamp each time manually, is there a way to get git to ignore the timestamp on a merge?

What happens is that the authors submit the changes on a branch in most cases. Sometimes they have a version of that file that is quite out of date. When I go to merge, that one file gives me grief 95% of the time.

Is there an easy way around this? Am I approaching the problem wrong? Is there a better way to do this?