pragma mark - 生日判断

<pre>
-(NSString )dateToOld:(NSDate )bornDate{
//获得当前系统时间
NSDate currentDate = [NSDate date];
//获得当前系统时间与出生日期之间的时间间隔
NSTimeInterval time = [currentDate timeIntervalSinceDate:bornDate];
//时间间隔以秒作为单位,求年的话除以606024356
int age = ((int)time)/(360024365);
return [NSString stringWithFormat:@"%d",age];
}</pre>
<pre>

pragma mark - 精确到天数

-(NSString )dateToOld:(NSDate )bornDate{
//获得当前系统时间
NSDate currentDate = [NSDate date];
//获得当前系统时间与出生日期之间的时间间隔
NSTimeInterval time = [currentDate timeIntervalSinceDate:bornDate];
//时间间隔以秒作为单位,求年的话除以606024356
int age = ((int)time)/(360024365);
return [NSString stringWithFormat:@"%d",age];
}

pragma mark -根据出生日期返回详细的年龄(精确到天)

-(NSString *)dateToDetailOld:(NSDate *)bornDate{
//获得当前系统时间
NSDate *currentDate = [NSDate date];
//创建日历(格里高利历)
NSCalendar *calendar = [NSCalendar currentCalendar];
//设置component的组成部分
NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond ;
//按照组成部分格式计算出生日期与现在时间的时间间隔
NSDateComponents *date = [calendar components:unitFlags fromDate:bornDate toDate:currentDate options:0];

//判断年龄大小,以确定返回格式
if( [date year] > 0)
{
    return [NSString stringWithFormat:(@"%ld岁%ld月%ld天"),(long)[date year],(long)[date month],(long)[date day]];
    
}
else if([date month] >0)
{
    return [NSString stringWithFormat:(@"%ld月%ld天"),(long)[date month],(long)[date day]];
    
}
else if([date day]>0)
{
    return [NSString stringWithFormat:(@"%ld天"),(long)[date day]];
    
}
else {
    return @"0天";
}

}

</pre>
原贴地址:http://www.jianshu.com/p/fe6bd981b9f4