Yep, that's cool.
As for you seeing bizarre timestamps on posts, that would happen when you're browsing as a guest or have been timed out. The forum defaults to GMT.
If you tick the little remember me box, you shouldn't get logged out whilst typing a reply.
If, as you say, you do a cache/cookie clean upon finishing browsing, then you will be required to re-log in again the next time you visit.
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