I was needing a multiple time zone clock and ran across this excellent Instructables.com article. Raspberry-Pi-Amateur-Radio-Digital-Clock

The case here was created to house the project. I left the labeling off the design so that I could easily change the displayed time zones.

I'll be monitoring this and see if I need to add a fan but given the light workload of the script, it will probably be fine at normal room temperature.

One caveat I discovered the hard way, if you upgrade the Pi to Bullseye, you will have to make the following edits to make the script run under Python3:

• In raspiclock.py, change "ConfigParser" to "configparser" in line 13.
• In TM1637.py, change line 213 from "data.append(ord(PATTERN[ord(c) - 32]) + msb)" to "data.append(PATTERN[ord(c) - 32] + msb)"
• in crontab, change "python" to "python3"

Materials:

• Raspberry Pi Zero W
• 4 - TM1637 4 digit 0.56" LED Display modules
• Wire harness with 16 wires (each TM1637 needs 4 wires)
• Soldering Iron & solder
• 8GB MicroSD or larger for Pi
• 5v power supply for Pi

Have fun!