This is a WorldClock implementation using Atmega 328 and DS1307 as a RTC.
This project was inspired by this instructable that relies on a DS1302 instead of a DS1307. A couple of changes had to be made since these clocks work in different ways (DS1302 Datasheet and DS1307 Datasheet).
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Get all the parts necessary according to the Bill of Materials in Part 8 of the instructable linked above (for electronics you may use the schematic if you prefer)
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Etch the PCB using your favorite method or using a service like OSH Park
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Flash the program into your Atmega 328 using your programmer of choice
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Solder every component into your PCB
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Test it out
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Follow the instructions linked above in order to build the clock's enclosure
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Put everything together
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Enjoy!