- local loc_now = os.time()
- local loc_m = os.time { year = os.date("%Y"), month = os.date("%m"), day = os.date("%d"), hour = 0 }
- local loc_t = os.difftime(loc_now, loc_m)
- local loc_d = os.date("*t", loc_now)
- local utc_d = os.date("!*t", loc_now)
- local utc_now = os.time(utc_d)
- local offdt = (loc_d.isdst and 1 or 0) * 3600 + 100 * (loc_d.min - utc_d.min) / 60
- local offset = os.difftime(loc_now, utc_now) + offdt
- local offday = (offset < 0 and -86400) or 86400
-
- if math.abs(loc_now - utc_now - offdt + loc_t) >= 86400 then
- utc_now = utc_now + offday
- end
-
- if offday * (loc_now - utc_now - offdt) > 0 then
- sunrise = sunrise + offday
+ local loc_now = os.time() -- local time
+ local loc_m = os.time { year = os.date("%Y"), month = os.date("%m"), day = os.date("%d"), hour = 0 } -- local time from midnight
+ local loc_d = os.date("*t", loc_now) -- table YMDHMS for current local time (for TZ calculation)
+ local utc_d = os.date("!*t", loc_now) -- table YMDHMS for current UTC time
+ local utc_now = os.time(utc_d) -- UTC time now
+ local offdt = (loc_d.isdst and 1 or 0) * 3600 + 100 * (loc_d.min - utc_d.min) / 60 -- DST offset
+ local offset = os.difftime(loc_now, utc_now) + (loc_d.isdst and 1 or 0) * 3600 + 100 * (loc_d.min - utc_d.min) / 60 -- TZ offset (including DST)
+ local offday = (offset < 0 and -86400) or 86400 -- 24 hour correction value (+86400 or -86400)
+
+ -- if current UTC time is earlier then local midnight -> positive offset (negative otherwise)
+ if offset * (loc_m - utc_now + offdt) > 0 then
+ sunrise = sunrise + offday -- Shift sunset and sunrise times by 24 hours