将NSNumber(double)值转换为时间

时间:2009-08-11 08:18:56

标签: objective-c nsnumber

我尝试将像“898.171813964844”这样的值转换为00:17:02(hh:mm:ss)。

如何在目标c中完成?

感谢您的帮助!

4 个答案:

答案 0 :(得分:31)

最终解决方案:

NSNumber *time = [NSNumber numberWithDouble:([online_time doubleValue] - 3600)];
NSTimeInterval interval = [time doubleValue];    
NSDate *online = [NSDate date];
online = [NSDate dateWithTimeIntervalSince1970:interval];    
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:@"HH:mm:ss"];

NSLog(@"result: %@", [dateFormatter stringFromDate:online]);

答案 1 :(得分:9)

假设您只对小时,分钟和秒感兴趣并且输入值小于或等于86400,您可以执行以下操作:

NSNumber *theDouble = [NSNumber numberWithDouble:898.171813964844];

int inputSeconds = [theDouble intValue];
int hours =  inputSeconds / 3600;
int minutes = ( inputSeconds - hours * 3600 ) / 60; 
int seconds = inputSeconds - hours * 3600 - minutes * 60; 

NSString *theTime = [NSString stringWithFormat:@"%.2d:%.2d:%.2d", hours, minutes, seconds];   

答案 2 :(得分:3)

我知道答案已经被接受了,但是我的回答是使用NSDateFormatter并考虑到时区(到你的时区时间[例如GMT + 4]被意外添加@Ben)

    NSTimeInterval intervalValue = 898.171813964844;
    NSDateFormatter *hmsFormatter = [[NSDateFormatter alloc] init];
    [hmsFormatter setDateFormat:@"HH:mm:ss"];
    [hmsFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    NSLog(@"formatted date: %@", [hmsFormatter stringFromDate:[NSDate dateWithTimeIntervalSinceReferenceDate:intervalValue]]);

[旁注] @phx:假设898.171813964844以秒为单位,这将代表00:14:58而不是00:17:02。

答案 3 :(得分:1)

  1. 使用-doubleValue
  2. 将您的NSNumber值转换为NSTimeInterval
  3. 使用+dateWithTimeIntervalSinceNow:
  4. 将您的NSTimeInterval值转换为NSDate
  5. 使用-descriptionWithCalendarFormat:timeZone:locale:
  6. 将NSDate转换为NSString