两个NSDate之间的小时差异 [英] Difference in hours between two NSDate

问题描述

这里我试图计算两个日期之间的小时数。当我运行应用程序时，它崩溃了。你能否告诉我这段代码中的错误？

Here I'm trying to calculate the hours between two dates. When i run the application, it crashes. Could you please tell me the mistake in this code?

NSString *lastViewedString = @"2012-04-25 06:13:21 +0000";
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat: @"yyyy-MM-dd HH:mm:ss zzz"];

NSDate *lastViewed = [[dateFormatter dateFromString:lastViewedString] retain];
NSDate *now = [NSDate date];

NSLog(@"lastViewed: %@", lastViewed); //2012-04-25 06:13:21 +0000
NSLog(@"now: %@", now); //2012-04-25 07:00:30 +0000

NSTimeInterval distanceBetweenDates = [now timeIntervalSinceDate:lastViewed];
double secondsInAnHour = 3600;
NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;

NSLog(@"hoursBetweenDates: %@", hoursBetweenDates);

推荐答案

我认为差异应该是int值...

I think difference should be in int value...

NSLog(@"hoursBetweenDates: %d", hoursBetweenDates);

希望，这会对你有帮助..

Hope, this will help you..

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