如何在iphone sdk中比较两个日期和时间 [英] how to compare two dates and time in iphone sdk

问题描述

这是我正在尝试的事情

NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];
NSDate *serDate;
NSDate *endDate;
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
serDate = [formatter dateFromString:@"2012-12-07 7:17:58"];
endDate = [formatter dateFromString:@"2012-12-07 08:43:30"];
int remainigSecond =[endDate timeIntervalSinceDate:serDate];
NSString * Hrs = @"1.30";// is Hrs
if (remainigSecond>3600*[Hrs intValue])
    return 1;
else
    return 0;

它没有回应预期......你能帮他解决这个问题吗

it does not response expected... Can you help he whats wrong in this please

提前致谢

推荐答案

    NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];
    NSDate *serDate;

    NSDate *endDate;

    [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    serDate = [formatter dateFromString:@"2012-12-07 7:17:58"];

    endDate = [formatter dateFromString:@"2012-12-07 08:43:30"];
    NSTimeInterval timeDifference = [endDate timeIntervalSinceDate:serDate];

    double minutes = timeDifference / 60;

    double hours = minutes / 60;

    double seconds = timeDifference;

    double days = minutes / 1440;
    NSLog(@" days = %.0f,hours = %.2f, minutes = %.0f,seconds = %.0f", days, hours, minutes, seconds);

并比较如下..

if (hours > 1.30)
    return 1;
else
    return 0;

且outPut 天= 0，小时= 1.43，分钟= 86 ，秒= 5132

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