@samm_cz: If you need more flexible timezone and DST handling (for example, if you need every timezone in the world from the IANA TZ database) take a look at https://github.com/bxparks/AceTime.
Also, the commenter on your website is correct about fading OLED displays. The cheap 128x64 OLEDs selling on eBay for $1-$2 seem to degrade within 6 months. I hope to use an LCD for my next clock.