Quantity   Component name
1 × Hammond 1591 XXD enclosure the largest flanged enclosure available at my local electronics store
1 × Arduino Pro Mini 328 – 3 V / 12 MHz
1 × many LEDs to make the display
1 × RTC Seeed Studio Grove RTC (DS1307) because that's all my local electronics store had
1 × light sensor(s) I was planning to use LEDs, but I think I'll switch to phototransistors.