iphone - 如何根据当前日期获取下一个 15 天的日期？

Question

目前我可以使用以下代码获取 iPhone 的当前日期

NSDate* date = [NSDate date];
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd"];
NSString* currentDateStr = [formatter stringFromDate:date];
NSLog(@"User's current Date:%@",currentDateStr);

但我想从当前日期获得下一个 15 天的日期，我怎样才能得到呢？

Answer 1

试试这个：

NSCalendar* calendar = [[[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar] autorelease];
NSDateComponents* components = [[[NSDateComponents alloc] init] autorelease];
components.day = 15;
NSDate* newDate = [calendar dateByAddingComponents: components toDate: self.date options: 0];

Answer 2

NSDate *todayDate = [NSDate date];
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setDay:+15];
NSDate *afterfifteenDays = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponents toDate:todayDate options:0];
NSLog(@"todayDate: %@", todayDate);
NSLog(@"afterfifteenDays: %@", afterfifteenDays);

Answer 3

试试这个：

NSTimeInterval totalOffset = /*time to add - in seconds */
NSDate *today = [NSDate date];
NSDate *endWithTZ = [today dateByAddingTimeInterval:totalOffset];

Answer 4

可能有更好的方法（我正在看这个问题，看看是否有），但这是我目前使用的：

+ (NSDate *)offsetFromDate:(NSDate *)fromDate withDays:(int)days 
{
    NSTimeInterval timeInterval = (days * 86400);
    NSDate *date = [[NSDate alloc] initWithTimeInterval:timeInterval sinceDate:fromDate];    
    return date;
}

如果你用谷歌搜索一天的秒数，你会得到 86400 的值。

Answer 5

  NSLog(@"%@", [date dateByAddingTimeInterval:15*24*60*60]);