Question

我有两个格式为Fri的字符串，2016年1月22日10:46:50 +0530。我需要比较这两个字符串。如果可以通过将它们转换为日期来完成，我该如何编写NSDateFormatter样式。试过下面的代码。但没有工作。我将newDate和currentDate设为nil。任何帮助将不胜感激。

NSString *dateString1 = @"Fri, 22 Jan 2016 10:46:50 +0530";
NSString *dateString2 = @"Fri, 21 Jan 2016 10:46:50 +0530";
NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
[inputFormatter setDateStyle:NSDateFormatterFullStyle];

NSDate *newDate = [inputFormatter dateFromString:dateString1];
NSDate *currentDate = [inputFormatter dateFromString:dateString2];

[inputFormatter release];

NSComparisonResult result = [newDate compare:currentDate]; // comparing two dates

if(result == NSOrderedAscending || result == NSOrderedSame) {
    NSLog(@"newDate is less or same");
}

Answer 1

使用[inputFormatter setDateFormat:@"EEE, DD MMM yyyy HH:mm:ss z"];

    NSString *dateString1 = @"Fri, 22 Jan 2016 10:46:50 +0530";
    NSString *dateString2 = @"Fri, 22 Jan 2016 10:46:50 +0530";

    NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];

    [inputFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss Z"];

    NSDate *newDate = [inputFormatter dateFromString:dateString1];
    NSDate *currentDate = [inputFormatter dateFromString:dateString2];

    NSComparisonResult result = [newDate compare:currentDate]; // comparing two dates

    if(result == NSOrderedAscending || result == NSOrderedSame) {
        NSLog(@"newDate is less or same");
    }

Answer 2

设置dateformat，如

如果您的时间格式是12小时 - 如果您的时间格式是24小时使用，则使用hh其他 - HH

      NSString *dateString1 = @"Fri, 22 Jan 2016 10:46:50 +0530";
[inputFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss Z"];

如果您使用ARC，则不需要此[inputFormatter release];

如何在Objective C中比较日期格式的字符串

2 个答案: