Post Expirator Time Zone Shift?

I’ve run into a weird problem with the Post Expirator plugin (v. 1.4) – the times it displays are shifted 4 hours ahead of my time, but other than that, it seems to be functioning properly. My blog has many users, though, and it would help if it displayed the correct time, so they don’t get confused.

Here’s an example:

If it’s 9:00pm here, and I go to the Post Expirator settings page, the example times there will show 1:00am. When I make a new post, the Post Expirator box will be pre-filled with 21:00, though — the correct time. If I make a post and set the expiration time to 21:05, the post itself will show an expiration date of 21:05, but the post footer on the front page will display 1:05. The post will, in fact, be deleted at 9:05pm, and NOT at 1:05am, as the footer says it will.

So here’s where it gets weird, maybe: If I set the timezone of my blog to Tokyo (I’m in Tennessee), and reset the cron schedules in the Post Expirator settings, the time ‘pre-loaded’ in the Post Expirator box on an Add New Post page will be the correct Tokyo time. But the examples on the Post Expirator settings page, and the time displayed in a new post footer will still be 4 hours later than my local (EDT) time!

Any idea what might be up?