Solstice dates on iOS -

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i'm in process of putting app makes use of suns position @ both summer , winter solstice. while there plenty of tables of data out there, i'm wondering if there standard ios components can used calculate or retrieve solstice dates without having embed , lookup data.

taking advice comments, following implemented gregorian date hours , minutes julian date.

- (nsdate *) datefromjuliandate:(double)juliandate {   nscalendar *gregoriancalendar = [[nscalendar alloc] initwithcalendaridentifier:nsgregoriancalendar];   nsdate *gregoriandate;    double datepart = floor(juliandate);   double timepart = juliandate - datepart + 0.5;    // next calendar day?   if (timepart >= 1.0) {     timepart = timepart - 1.0;     datepart = datepart + 1;   }    double l = datepart + 68569;   double n = floor (4 * l / 146097);   l = floor(l) - floor((146097 * n + 3) / 4);   int year = floor(4000 * (l + 1) / 1461001);   l = l - (floor(1461 * year / 4)) + 31;   int month = floor(80 * l / 2447);   int day = l - floor(2447 * month / 80);   l = floor(month / 11);   month = floor(month + 2 - 12 * l);   year = floor(100 * (n - 49) + year + l);   double hour = timepart * 24.0;   double minutepart = hour - floor(hour);   hour = floor(hour);   double minute = minutepart * 60;   nsdatecomponents *datecomponents = [[nsdatecomponents alloc] init];   [datecomponents setyear:year];   [datecomponents setmonth:month];   [datecomponents setday:day];   [datecomponents sethour:hour];   [datecomponents setminute:minute];   [datecomponents settimezone:[nstimezone timezonewithname:@"gmt"]];   gregoriandate = [gregoriancalendar datefromcomponents:datecomponents];    return [gregoriandate copy]; }

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