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Analog clocks have always annoyed me, so I decided to make my own. This is the logical solution I think. There's only one hand, which moves round once a day and shows where the sun is on the map. In the photo it is nearly 10pm in the UK so the sun is over the Alaska timezone. The 6am-6pm line is your horizon, so the top half is your daytime.

This one is for GMT/UTC - you'd need to rotate the map for different timezones, to put your location at the top under the noon marker.

The map is an azimuthal equal-area projection, made with NASA's G.Projector:

I bought a 24-hour clock and simply inserted the printed map in place, after removing the minute and second hands.
Debby Edwards (DebbyB)'s profile photoJim Hutton's profile photoTim Hutton's profile photodeborah rabbit white's profile photo
Brilliant - get someone to make these for you and sell them - I'd buy one as long as they aren't too expensive
I'm imagining a little DST correction lever that would rotate the map together with the clock mechanism against the numbers.
Really neat. Thanks for sharing!
I think it's possible to put numbers on clock's glass somehow (transparent film or something) to be able to rotate a map independently.
Thanks everyone for the kind words! +Debby Edwards, +Karen Peck: I don't want to make them for money but I'd certainly help you make your own. I'll post full instructions.
Yes, indeed, post instructions!  This would make for a very educational clock for the kids.
Might also be interesting to keep the numbers stationary with the "sun" at the top, then rotate the map.
+Adam Liss: Yes, especially for those in the Southern hemisphere: I think I prefer a fixed map because a) it's easier to read, b) it's easier to make from a clock, c) you get a nice horizon line and d) it is closer to a sundial. But give it a go and let me know what you make.
You should sell those!
I'll order one, preassembled or as an assembly kit. 
My only requirement is that it shouldt have ticking sounds -- these hurt my concentration 
Thanks +Tim Hutton the bf is going to make it. Ill post a pic when we're done if we're successful. It's a brilliant idea-if u ever fancy a little sideline u know u can always sell these, everyone wants one!!
Hi Tim
Where did you get the 24-hr clock ?
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