如何在iphone sdk中比较两个日期和时间

Question

这是我正在尝试的

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......你能帮助他解决这个问题吗？

提前致谢

Answer 1

compare:function可用于有效地比较两个日期.

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"];

if([serDate compare:endDate])
    NSLog(@"Enddate bigger than serdate");
else
    NSLog(@"serdate bigger than enddate");