Hi Vladamir,
Your SunCalc app looks great!
However, when I tried it for New Zealand, the time appears to be wrong by 2 hours.
Example, SunCalc says 18.10pm
http://suncalc.net/#/-43.7572,172.3692,11/2016.03.04/14:49
While timeanddate shows 20.10pm (correct)
http://www.timeanddate.com/sun/new-zealand/christchurch?month=3&year=2016
It may be something to do with daylight savings?
Just thought you would like to know!
Cheers,
Matt