Hey Conan. On Japanese H!P Wiki I recently put up a clock that shows JST time, at the upper-right corner of the content section, above the Contribute button. Now it's being copied over to some of the other languages too, though as I type this the change isn't live anywhere else yet. If you think this would be a good addition here, I can tell you how to add it; it's a pretty simple thing.
Once that's saved, at the right side of the page there should be a few buttons, "Submit for review" and "Enter test mode". Test mode lets you test the changes just for yourself, to make sure it's working properly. Submit for review will send it off to be okayed by whoever they have checking such things, and once they're done it will go live for anyone viewing the wiki.