使用 NSDateFormatter 从 NSString 格式化日期
我有以下代表日期和日期的字符串时间
NSString *shortDateString = @"Sat28Apr2012 15:00";
（没有空格（除了时间前面的一个空格），就像上面一样）
我想使用以下方法格式化该日期：
NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
// Question is regarding the line below:
[inputFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm"];
NSDate *formatterDate = [inputFormatter dateFromString:shortDateString];
NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
[outputFormatter setTimeZone:gmt];
[outputFormatter setDateFormat:@"dd.MMM.yyyy HH:mm Z"];
NSString *newDateString = [outputFormatter stringFromDate:formatterDate];
I have the following string representing a date & time
NSString *shortDateString = @"Sat28Apr2012 15:00";
(no spaces (apart from a single space in front of the time), just as it is above)
I would like to format this date using:
NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
// Question is regarding the line below:
[inputFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm"];
NSDate *formatterDate = [inputFormatter dateFromString:shortDateString];
NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
[outputFormatter setTimeZone:gmt];
[outputFormatter setDateFormat:@"dd.MMM.yyyy HH:mm Z"];
NSString *newDateString = [outputFormatter stringFromDate:formatterDate];
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如果您稍微更改字符串以完全匹配输入的格式，它就可以正常工作。您需要做的就是从字符串中删除空格和逗号，如下所示：
使用此字符串，我得到以下结果：
It is
19:00, not15:00，因为我的时区比 GMT 晚四个小时。If you change your string slightly to match the format of your input exactly, it works fine. All you need to do is removing spaces and the comma from the string, like this:
With this string I get the result below:
It is
19:00, not15:00, because my time zone is four hours behind GMT.