This app was mentioned in 7 comments, with an average of 2.00 upvotes
I use one (on Android) called "Sun Alarm". I love it.
* Has very pleasing sounds
* Can have just sunrise, just sunset, or both
* Can set an offset time, like get alarm 15 minutes before.
https://play.google.com/store/apps/details?id=com.vvse.sunalarm&hl=en_US&gl=US
Try one of these:
https://play.google.com/store/apps/details?id=com.vvse.sunalarm&hl=en
https://play.google.com/store/apps/details?id=com.alokmandavgane.sunrisesunset&hl=en_US
You didn't specify android/iphone so that's for android.
Either way i don't use any.
Sun Alarm https://play.google.com/store/apps/details?id=com.vvse.sunalarm
You can set a alarm based on time difference from "event" and sunrise is one of the events
I understand. How about this?
https://play.google.com/store/apps/details?id=com.vvse.sunalarm
Sun Alarm for Android
https://play.google.com/store/apps/details?id=com.vvse.sunalarm