Question

我正在尝试将日期字符串转换为另一种格式。我是这样做的。

NSLog(@"datestring is NOW %@",_dayObject.p_date);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"YYYY-MM-DD"];
NSDate *date = [dateFormat dateFromString:_dayObject.p_date];
NSLog(@"date transformed %@",date);
[dateFormat setDateFormat:@"EEEE, dd/MM/YYYY"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];
NSString *dateStr = [dateFormat stringFromDate:date];
NSLog(@"datestring is AFTER %@",dateStr);

但这是我从NSLOG获得的

2013-04-18 08:43:36.181 mosaqua2[9629:907] datestring is NOW 2013-05-04
2013-04-18 08:43:36.184 mosaqua2[9629:907] date transformed 2013-01-03 23:00:00 +0000
2013-04-18 08:43:36.184 mosaqua2[9629:907] datestring is AFTER donderdag, 03/01/2013

我想要的是

Saterday, 04/05/2013

有人能帮助我吗？

Answer 1

使用我的这个波纹管自定义方法转换日期格式...

-(NSString *)changeDateFormat:(NSString*)stringDate dateFormat:(NSString*)dateFormat getwithFormat:(NSString *)getwithFormat{


    NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormatter setDateFormat:dateFormat];

    NSDate *date = [dateFormatter dateFromString:stringDate];

    dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormatter setDateFormat:getwithFormat];

    NSString *convertedString = [dateFormatter stringFromDate:date];
    NSLog(@"Converted String : %@",convertedString);
    return convertedString;
}

并像下面那样使用它......

NSString *strSDate = [self changeDateFormat:_dayObject.p_date dateFormat:@"yyyy-MM-dd" getwithFormat:@"EEEE, dd/MM/yyyy"];
NSLog(@"datestring is AFTER %@",strSDate);

请看My Blog这篇帖子......

Answer 2

检查这个......

NSLog(@"datestring is NOW ==>> %@", _dayObject.p_date);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];

NSDate *date = [dateFormat dateFromString: _dayObject.p_date];
NSLog(@"date transformed ==>> %@",date);
[dateFormat setDateFormat:@"EEEE, dd/MM/yyyy"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];
NSString *dateStr = [dateFormat stringFromDate:date];
NSLog(@"datestring is AFTER ==>> %@",dateStr);

<强>输出：〜

datestring是NOW ==＆gt;＆gt; 2013年5月4日

日期转换==＆gt;＆gt; 2013-05-04 00:00:00 +0000

日期字符串是AFTER ==＆gt;＆gt;星期六，04/05/2013

Answer 3

检查参数的字符大小写

NSLog(@"datestring is NOW %@",_dayObject.p_date);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd hh:mm:ss"]; //MODIFIED
NSDate *date = [dateFormat dateFromString:_dayObject.p_date];
NSLog(@"date transformed %@",date);
[dateFormat setDateFormat:@"EEEE, dd/MM/yyyy"]; //MODIFIED
NSString *dateStr = [dateFormat stringFromDate:date];
NSLog(@"datestring is AFTER %@",dateStr);

Answer 4

请尝试..这样可以获得周名称

  NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"eeee"];
 NSCalendar * cal = [NSCalendar currentCalendar];
NSUInteger numWeekdays = [cal maximumRangeOfUnit:NSWeekdayCalendarUnit].length;
 NSDateComponents * comp = [[NSDateComponents alloc] init];
for( NSUInteger day = 1; day <= numWeekdays; day++ ){
[comp setWeekday:day];
[comp setWeek:0];
NSDate * date = [cal dateFromComponents:comp];

NSString * dayName = [dateFormat stringFromDate:date];

NSLog(@"%@", dayName);
}

Answer 5

你做得很好，除了setTimeZone，评论你会得到你的输出。

NSLog(@"datestring is NOW %@",_dayObject.p_date);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"YYYY-MM-DD"];
NSDate *date = [dateFormat dateFromString:_dayObject.p_date];
NSLog(@"date transformed %@",date);
[dateFormat setDateFormat:@"EEEE, dd/MM/YYYY"];
//[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]]; //NOT NEEDED
NSString *dateStr = [dateFormat stringFromDate:date];
NSLog(@"datestring is AFTER %@",dateStr);

Answer 6

改变这个：“YYYY”

致：“yyyy”

错误原因，

使用YYYY是一个常见的错误。 yyyy指定日历年而YYYY指定ISO中使用的年份（“年度周”）年周历。在大多数情况下，yyyy和YYYY产生相同的结果数字，但它们可能不同。通常你应该使用历年。

NSDate未正确转换

6 个答案: