NSLog显示前一个日期 [英] NSLog showing the previous Date

问题描述

我想从两个日期之间添加的核心数据中检索所有条目。我使用 NSPredicate 。因为我没有得到正确的结果我尝试记录日期。它显示以前的日期。在搜索一段时间后，我添加

dateFormatter setTimeZone：[NSTimeZone timeZoneForSecondsFromGMT：0]]; 到我的代码。现在，它显示正确的日期，但结果仍然是错误的。

这是我使用的代码。

  NSDate * fromDate = [[self dateFormatter] dateFromString：self.fromDateField.text]; 
 NSLog（@％@，fromDate）; 
 NSDate * toDate = [[self dateFormatter] dateFromString：self.toDateField.text]; 
 NSLog（@％@，toDate）; 
 NSComparisonResult result = [fromDate compare：toDate]; 
 switch（result）{
 case NSOrderedAscending：
 {
 // code 
} 
 
  - （NSDateFormatter *）dateFormatter 
 {
 static NSDateFormatter * dateFormatter = nil; 
 if（dateFormatter == nil）
 {
 dateFormatter = [[NSDateFormatter alloc] init]; 
 [dateFormatter setDateStyle：NSDateFormatterMediumStyle]; 
 [dateFormatter setTimeStyle：NSDateFormatterNoStyle]; 
 [dateFormatter setTimeZone：[NSTimeZone timeZoneForSecondsFromGMT：0]]; 
} 
 return dateFormatter;先感谢提前
   h2_lin>解决方案
如果你直接记录一个NSDate对象，它总是显示在GMT / UTC时区的tome。 
  NSLog（@％@，[self.dateFormatter stringFromDate：toDate ]）; 
  
这将占用您的时区帐户。或更好：日期格式的日历的时区 - 如果您不更改设备默认值。
 
I want to retrieve  all the entries from core data added between two dates.I am using NSPredicate. As I am not getting the correct result I tried logging the date.It is showing the previous dates.After googling for a while I added

[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; to my code.Now,Its showing correct dates but the results are still wrong.

This is the code I used.
NSDate *fromDate = [[self dateFormatter]dateFromString:self.fromDateField.text];
NSLog(@"%@",fromDate);
NSDate *toDate = [[self dateFormatter]dateFromString:self.toDateField.text];
NSLog(@"%@",toDate);
NSComparisonResult result = [fromDate compare:toDate];
switch (result) {
    case NSOrderedAscending:
    {
        //code
    }

- (NSDateFormatter *)dateFormatter
{
static NSDateFormatter *dateFormatter = nil;
if (dateFormatter == nil) 
{
    dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    [dateFormatter setTimeStyle:NSDateFormatterNoStyle];
    [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
}
   return dateFormatter;
}
Thanks in advance
解决方案
If you log an NSDate object directly it will always display the tome in GMT/UTC timezone. you have to log the output of a date formatter.
NSLog(@"%@",[self.dateFormatter stringFromDate:toDate]);
This will take your timezone in account. Or better: the timezone of the dateformatter's calendar — what is the device default if you dont change that.

                        
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