一、给一个时间，给一个数，正数是以后n个月，负数是前n个月；
-(NSDate *)getPriousorLaterDateFromDate:(NSDate *)date withMonth:(NSInteger)month
{
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setMonth:month];
NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDate *mDate = [calender dateByAddingComponents:comps toDate:date options:0];
return mDate;
}
二、设置你需要增加或减少的年、月、日即可获得新的日期。
- (NSDate *)getLaterDateFromDate:(NSDate *)date withYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day {
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = nil;
comps = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:date];
NSDateComponents *adcomps = [[NSDateComponents alloc] init];
[adcomps setYear:year];
[adcomps setMonth:month];
[adcomps setDay:day];
NSDate *newdate = [calendar dateByAddingComponents:adcomps toDate:date options:0];
return newdate;
}
