blocks|key|2919|text|我想你的timeInterval计算是反向的，不是吗？我觉得你想反其道而行之。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2920|double+timeInterval+=+[timeNow+timeIntervalSinceDate:timeSaved];|code-block|syntax|javascript|2921|entityMap^0|4|C|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I think you have your <code>timeInterval</code> calculation backwards, don't you? I think you want to say it reversed.

<pre><code>double timeInterval = [timeNow timeIntervalSinceDate:timeSaved];
</code></pre>

blocks|key|1494753|text|有几个问题。首先，在您的stringWithFormat:中，您希望使用%25g，而不是%25d，%25d用于整数值。另外，你应该做[timeNow+timeIntervalSinceDate:timeSaved]你的当前调用会给你一个负值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1494754|entityMap^0|C|H|1O|15|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

there are a couple of issues. First, in your <code>stringWithFormat:</code> you want to use %g, not %d, %d is for integer values. Also, you should do <code>[timeNow timeIntervalSinceDate:timeSaved]</code> your current call will give you a negative value.

blocks|key|1494765|text|下面是我使用的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1494766|在我的应用程序中，当用户同步一些数据时，我使用以下代码记录当前日期/时间：|1494767|NSUserDefaults+*prefs+=+[NSUserDefaults+standardUserDefaults];
[prefs+setObject:[NSDate+date]+forKey:@"LastSyncDate"];
[prefs+synchronize];|code-block|syntax|javascript|1494768|然后，如果我想要查看自上次同步以来有多少天了，我可以使用以下命令：|1494769|NSUserDefaults+*prefs+=+[NSUserDefaults+standardUserDefaults];
NSDate*+dateOfLastSync+=+[prefs+objectForKey:@"LastSyncDate"];
if+(dateOfLastSync+!=+nil)
{
++++NSDate+*timeNow+=+[NSDate+date];
++++double+SECONDS_TO_DAY+=+60+*+60+*+24;
++++int+timeIntervalInDays+=+(int)([timeNow+timeIntervalSinceDate:dateOfLastSync]+/+SECONDS_TO_DAY);
++++NSLog(@"The+last+sync+was+%25d+days+ago.",+timeIntervalInDays);
}|1494770|希望这能有所帮助。|1494771|麦克|1494772|www.MikesKnowledgeBase.com|offset|length|1494773|entityMap|0|LINK|mutability|MUTABLE|url|http://www.mikesknowledgebase.com/^0|0|0|0|0|0|0|0|0|Q|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@$S|1A|T|1B|1|1C]]|A|$]]|$1|U|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]]]

Here's the code I use.

In my app, when the user syncs some data, I record the current date/time using this code:

<pre><code>NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:[NSDate date] forKey:@"LastSyncDate"];
[prefs synchronize];
</code></pre>

Then, if I want to see how many days it's been since they last synced, I can use this:

<pre><code>NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSDate* dateOfLastSync = [prefs objectForKey:@"LastSyncDate"];
if (dateOfLastSync != nil)
{
 NSDate *timeNow = [NSDate date];
 double SECONDS_TO_DAY = 60 * 60 * 24;
 int timeIntervalInDays = (int)([timeNow timeIntervalSinceDate:dateOfLastSync] / SECONDS_TO_DAY);
 NSLog(@"The last sync was %d days ago.", timeIntervalInDays);
}
</code></pre>

Hope this helps.

Mike

<a href="http://www.mikesknowledgebase.com" rel="nofollow">www.MikesKnowledgeBase.com</a>

last resort this as I cannot for the life of me work it out!

I am setting a date when my app is closed (using applicationWillTerminate) in user defaults

<pre><code>NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSDate *timeClosed = [[NSDate alloc] init];
[defaults setObject: timeClosed forKey:@"svdTimeClosedApp"];
</code></pre>

then when the app is launched, I want to compare this time using

<pre><code>NSDate *timeSaved = svdTimeClosedApp;
NSDate *timeNow = [[NSDate alloc] init];
double timeInterval = [timeSaved timeIntervalSinceDate:timeNow];
NSLog(@"time now = %@, time saved = %@, time diff = %@", timeNow, timeSaved, [NSString stringWithFormat:@"%d",timeInterval]);
</code></pre>

I tried to output this to the log window expecting to see a nicely formatted string of around 20 seconds. Trouble is, it's coming out as 2047868928! 

Any ideas?!

(output of the log window below)

<pre><code>time now = 2009-12-19 20:54:02 +0000, time saved = 2009-12-19 20:48:29 +0000, time diff = 2047868928
</code></pre>

Thanks for any help!

timeIntervalSinceDate problem

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这是最后的办法，因为我这一生都不能解决它！我正在用户默认设置中设置应用程序关闭的日期(使用applicationWillTerminateNSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];NSDate *timeClosed = [[NSD...

问timeIntervalSinceDate问题
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