How to find Next Sunday in different Timezone (EST & IST) - ios

Question

I have to find next Sunday date (NSDate) from device's current date.
I have used below logic:
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [calendar components:NSCalendarUnitWeekday | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:self];
NSUInteger weekdayToday = [components weekday];
NSInteger daysToMonday = (8 - weekdayToday) % 7;
NSDate *weekEndPrev = [self dateByAddingTimeInterval:60*60*24*daysToMonday];
Here, in EST if time is near to 11 PM, I'm getting Monday as Weekend.
Let me know feasible solution. I have tried many options. Nothings works with 2 different timezones.
Thanks in Advance.

Answer 1

You need just to get the number of days you need and then just add them to your current date:
NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDate * newDate = [calendar dateByAddingUnit:NSCalendarUnitDay value:value toDate:date options:0];
where value - is the number of days to add

Answer 2

Find current week Sunday Date first then add 7 days using NSDateComponents.
NSDate *today = [[NSDate alloc] init];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *weekdayComponents = [gregorian components:NSCalendarUnitWeekday fromDate:today];
NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
[componentsToSubtract setDay:(0 - ([weekdayComponents weekday] - 1))];
NSDate *sudayCurWeek = [gregorian dateByAddingComponents:componentsToSubtract toDate:today options:0];
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setDay:7];
NSDate *nextSunday = [gregorian dateByAddingComponents:offsetComponents toDate:sudayCurWeek options:0];
NSLog(#"%#",nextSunday);

Answer 3

You can do this without any math, which is best left to NSCalendar as it handles daylight savings etc. First you need a calendar with the correct time zone. For example for IST:
NSCalendar *gc = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
gc.timeZone = [NSTimeZone timeZoneWithName:#"IST"];
Then you can use nextDateAfterDate:matchingUnit:value:options: to find the start of the next Sunday after a given time. For example:
NSDate *start = ... // the time you wish to start from
NSDate *nextSunday =
[gc nextDateAfterDate:start
matching:UnitNSCalendarUnitWeekday // match based on weekday number
value:1 // Sunday = weekday 1
options:NSCalendarMatchNextTime // read the docs!
];
The returned date, nextSunday, will be the next Sunday at 00:00 in the timezone of the calendar, gc.
HTH

Answer 4

Finally, I got solution..
NSDateComponents *components = [[NSCalendar currentCalendar] componentsInTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"UTC"] fromDate:[NSDate date]]; // Pass date for which you want to find next Sunday
NSUInteger weekdayToday = [components weekday];
NSInteger daysToMonday = (8 - weekdayToday) % 7;
NSDate *weekEndPrev = [[NSDate date] dateByAddingTimeInterval:60*60*24*daysToMonday];