JSON日期到NSDate结果为零[重复]

Question

我有一个 JSON 格式的日期字符串，如下所示：2014-02-07T00:00:00+08:00

我正在尝试将其转换为NSDate，格式为MM/dd/yyyy。

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSS"];

NSDate *date = [dateFormat dateFromString:datestring];
NSDateFormatter *newDateFormatter = [[NSDateFormatter alloc]init];
[newDateFormatter setDateFormat:@"MM/dd/yyyy"];

NSString *newString = [newDateFormatter stringFromDate:date];
NSLog(@"Date: %@, formatted date: %@", date, newString);

但结果为零。怎么了？

Answer 1

正确的日期格式是：

[dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssxxx"];

或

[dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZZZZZ"];

见：ICU Formatting Dates and Times

NSString *datestring = @"2014-02-07T00:00:00+08:00";

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:sszzz"];
NSDate *date = [dateFormat dateFromString:datestring];
NSDateFormatter *newDateFormatter = [[NSDateFormatter alloc]init];
[newDateFormatter setDateFormat:@"MM/dd/yyyy"];
NSString *newString = [newDateFormatter stringFromDate:date];
NSLog(@"Date: %@, formatted date: %@", date, newString);

NSLog 输出：

日期：2014-02-06 16:00:00 +0000，格式化日期：02/06/2014