If you're lucky enough to be wandering around NYC, you should check out the MoMA store which has a much higher percentage of awesomeness per square foot than most places I had the chance to see out there. MUJI fountain pens!
Inside, I saw an interesting clock by Charlotte Van Der Waals. You can see versions of it here. Basically, the clock rotates to 12 different spots, each with the names of two cities embossed into it. It's a cool trick. A 30-degree rotation moves the hour hand forward or back an hour. Clever, but almost too good to be true, right?
Yes, it is.
The first problem was the price. The range is $75 to $190 and that's too much for a clock that I could make myself. The second problem that I saw later is much worse. It doesn't work. This thing is seriously made useless by Daylight Saving Time. Tokyo doesn't observe it, the southern hemisphere countries have a reversed schedule, and the starting times vary from country to country. How does the fancy design for $190 sound now?
To solve this there need to be multiple faces that could be swapped. You could go by just a couple of faces (summer and winter) and get by or be more anal and make more. Personally, I'm just making two since it's really just the Tokyo time I care about. I could've just bought two clocks and had some tacky labels on them, but this is for my home and I don't want to feel like I live in an office.
Step 1: Buy a Cheap IKEA Clock
Step 2: Rip Out the Guts
Hour, minute, and second hands? Gone.
Paper backing? Gone, too.
Step 3: Drill Out Holes
Step 4: Add the Magnets
Step 5: Attach Lazy Susan Bearing
Step 6: Bolted
Step 7: Attach the Clock
Step 8: Print Out a New Backing
No, really, why the hell are you doing this? This will help you to choose what cities are important for you to know about. If you're only thinking about the states, forget about it. This project isn't worth it. You can keep a few hours of difference straight in your head. So what cities do you need to keep in contact with?
For me, it's the need to know what time it is for my parents who live in Tokyo. It didn't take long to figure out the seven or eight hour time difference (Japan has no DST), but I figured it'd be fun to know what time it was over there. And I went ahead and added more cities as well. Just be careful because different countries have different dates for DST starting and stopping and countries in the southern hemisphere are backwards about it. Which, you know, is how it should be.
I used Illustrator to make my clock face. Photoshop could also work. Or you can make one by hand.
Just remember to have the countries going clockwise as you go West around the globe.