Sonoff did not provide out-of-the-box solution to trigger on Sunset. And changing the dates manually it too old school. But if you watch this video you can create a proper Sunset trigger in Node-Red in 15 minutes and have your lights turn on exactly at Sunset.

For the timer node install: node-red-contrib-bigtimer
For the iHost nodes install: node-red-contrib-ewelink-cube

Node-Red flow: https://github.com/nygma2004/km/blob/...

Buy your iHost: https://itead.cc/product/sonoff-ihost...

Check my video on installing Node-Red on the iHost:    • Running Node-Red on the iHost and con...  

Chapters:
0:00 Intro
1:08 How it works?
3:56 Node-Red flow
6:15 Timer
9:03 Enabler
11:34 Outro