Question

{    
    NSDateFormatter *dateReader = [[NSDateFormatter alloc] init];

    [dateReader setDateFormat:@"dd-MM-YYYY"]; // for example

    NSDate *itsDate = [dateReader dateFromString:txtDate.text];
}

我使用此代码从字符串转换日期，我从UITextField文本中获取字符串。

但每次我得到“2013-01-04 18:30:00 +0000”这个日期，即使我的文本字段的日期也不同。所以我无法得到正确的日期。我该怎么办？

Answer 1

你可以使用＆＃34; datefromstring＃34;为你的问题。这里有一个例子：

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd MMM yyyy "];
NSDate *date1 = [dateFormatter dateFromString:YourDate_String];
 NSLog(@"Date: %@",date1);
[dateFormatter release];

Answer 2

这些功能肯定会帮助您根据输入和输出实现目标更改日期格式

-(NSDate *)convertStringToDate:(NSString *)stringDate
{
    stringDate=[self trimString:stringDate];
    stringDate = [stringDate stringByReplacingOccurrencesOfString:@"+00:00" withString:@""];
    stringDate = [stringDate stringByReplacingOccurrencesOfString:@"T" withString:@" "];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    [dateFormatter setDateFormat:@"dd-MM-yyyy"];
    NSDate *myDate = [dateFormatter dateFromString:stringDate];
    return myDate;
}

-(NSDate *)convertDateToDate:(NSDate *) date 
{
    NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];
NSDate *nowDate = [[[NSDate alloc] init] autorelease];
[formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
[formatter setDateFormat:@"yyyy-MM-d H:m:s"];
NSString * strdate = [formatter stringFromDate:date];
nowDate = [formatter dateFromString:strdate];
return nowDate;
}

-(NSString *)convertStringToString:(NSString *)DateLocal
{
    DateLocal = [self trimString:DateLocal];
    DateLocal=[DateLocal stringByReplacingOccurrencesOfString:@" GMT" withString:@""];
    NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    [dateFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss"];
    NSDate *date = [dateFormatter dateFromString: DateLocal];
    NSString *tt = [dateFormatter stringFromDate:date];
    NSDate *dateReturn = [dateFormatter dateFromString:tt];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"EEE. d MMMM yyyy, hh:mma"];//"Fri. 1 June 2012, 10:29AM"
    NSString *dateString = [dateFormat stringFromDate:dateReturn];  
    [dateFormat release];
    return dateString;
}

-(NSString *)convertDatetoString:(NSDate * )date
{
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSString *dateString = [dateFormat stringFromDate:date];  
    [dateFormat release];
    return dateString;
}

-(NSString *)dateFormatingCommonDateToString :(NSDate *)date formateString:(NSString *)strDateFormat
{
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:strDateFormat];
    NSString *dateString = [dateFormat stringFromDate:date];  
    [dateFormat release];
    return dateString;
}

-(NSDate *)dateFormatingCommonStringToDate :(NSString *)date formateString:(NSString *)strDateFormat
{
    date=[self trimString:date];
    date = [date stringByReplacingOccurrencesOfString:@"+00:00" withString:@""];
    date = [date stringByReplacingOccurrencesOfString:@"T" withString:@" "];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    [dateFormatter setDateFormat:strDateFormat];
    NSDate *myDate = [dateFormatter dateFromString:date];
    return myDate;
}

#pragma mark -
#pragma mark String Methods

-(NSString*)trimString:(NSString *)theString 
{
    NSString *theStringTrimmed = [theString stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
return theStringTrimmed;
}

无法从字符串转换日期

2 个答案: