如何使用 NSDateFormatter 将字符串日期转换为 NSDate [英] How to convert string date into NSDate with NSDateFormatter

问题描述

我有以下日期作为 NSString:

I have the following date as NSString:

Thu May 29 14:22:40 UTC 2014

我尝试使用以下代码将其转换为 NSDate:

I've tried to convert it to NSDate with the following code:

NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat =                  @"EEE MMM d HH:mm:ss zzz yyyy";
NSDate *utc = [fmt dateFromString:@"Thu May 29 14:22:40 UTC 2014"];
NSLog(@"UTC Date:%@:", utc);

结果是nil我尝试了几个 dateFormat 正则表达式，但没有成功.

The result is nil I've tried several dateFormat regex expressions but with no luck.

我在这里遗漏了什么?

推荐答案

使用 NSDataDetector 类是 NSRegularExpression 的子类，它接受一个未知日期的字符串，如果找到匹配项，则将其转换为 NSDate 对象.

Use NSDataDetector class a subclasss of NSRegularExpression, its takes a string that of a unknown date and converts it to NSDate object if it finds a match.

   NSError *error;
    NSDataDetector *data = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeDate error:&error];
    NSString *dateRaw = @"Thu May 29 14:22:40 UTC 2014"; // your date

    NSDate *date = [data firstMatchInString:dateRaw
                                    options:NSMatchingReportCompletion
                                      range:NSMakeRange(0, dateRaw.length)].date;

    NSLog(@"Date: %@",  date);

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