NSString转NSDate为nil原因

以下方法得到的createDate为nil

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];     //格式Thu May 05 10:04:37 +0800 2016     [formatter setDateFormat:@"EEE MMM dd HH:mm:ss zzz yyyy"];     NSDate *createDate = [formatter dateFromString:@"Thu May 05 10:04:37 +0800 2016"];

 

正确方式：

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];     //格式Thu May 05 10:04:37 +0800 2016     [formatter setDateFormat:@"EEE MMM dd HH:mm:ss zzz yyyy"];     formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];     NSDate *createDate = [formatter dateFromString:@"Thu May 05 10:04:37 +0800 2016"];