dateByAddingComponents: dateRange ToDate: Options firstdate: 0 retourne toujours trimestre

Question

J'utilise pour calculer une nouvelle date

- (NSDate *)dateByAddingComponents:(NSDateComponents *)comps toDate:(NSDate *)date options:(NSCalendarOptions)opts 

, comme ci-dessous:

NSDateComponents *quaterComps = [NSDateComponents new]; 
quaterComps.quarter = 1; 

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 

NSDate *nextDate = [gregorian dateByAddingComponents:quaterComps toDate:firstDate options:0]; 

Lorsque firstdate est 2013-12- 31 16:00:00 +0000,

API au-dessus de revient sans cesse le même résultat, pas la date de la prochaine trimestre

Answer 1

date ** et la date suivante **

NSDate *currentDate = [NSDate date]; 
    NSDate *futureTime = [currentDate dateByAddingTimeInterval:60*60*72]; 
    NSCalendar *calendar = [NSCalendar currentCalendar]; 
    NSTimeZone *timeZone = [NSTimeZone systemTimeZone]; 
    [calendar setTimeZone:timeZone]; 
    NSDateComponents *components = [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit fromDate:futureTime]; 
    if ([components hour] >= 19) { // make it the next day 
     [components setDay:[components day] + 1 ]; 
    } 
    [components setHour:8]; 
    [components setMinute:00]; 
    NSDate *alertTime = [calendar dateFromComponents:components]; 

Answer 2

NSDate *date = [NSDate date]; 
NSDateComponents *comp = [NSDateComponents new]; 
comp.weekOfYear = 3; 
NSDate *date1 = [[NSCalendar currentCalendar] dateByAddingComponents:comp toDate:date options:0]; 
NSLog(@"date: %@", date); 
NSLog(@"date1: %@", date1)