NSDate 从数据库返回错误的日期

Question

我有一个应用程序，用户可以订购一些商品，通过确认订单，订单日期被保存并插入到 sqlite 数据库中。

然后用户可以看到订单列表和订单日期，并且用户可以选择删除他们选择的任何日期的订单。

到这部分完全没有问题，当我选择要显示的订单时，数据库返回的日期是正确的。

当用户想要根据他们在日期选择器中选择的日期删除订单时，就会出现问题，此时我从订单对象中获取的日期总是在正确日期之前，例如：

-下单日期为2011/12/20 14:24:23 +0000
- 显示给用户的订单日期与上面相同
- 我想比较日期时的订单日期是 2011/12/19 14:24:23 +0000

有什么想法吗？

编辑：

#import "OrderListViewController.h"

@implementation OrderListViewController

@synthesize newOrderTabelView, transferedOrderTableView, salesOrderArr;
@synthesize newOrderTableViewController, transferedOrderViewController,salesOrder;
@synthesize newOrderTableViewHeader, transferedOrderTableViewHeader, datePicker,isPickerHidden;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        isPickerHidden=YES;
        [self initializeTableData];
    }
    return self;
}

- (void)dealloc
{
    [newOrderTabelView release];
    [transferedOrderTableView release];
    [newOrderTableViewController release];
    [transferedOrderViewController release];
    [salesOrderArr release];
    [newOrderTableViewController release];
    [transferedOrderViewController release];
    [salesOrder release];
    [datePicker release];
    [super dealloc];
}
- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}
-(void)editSaleOrderForEditButton
{
    YourCartViewController *yourCartViewController=[[YourCartViewController alloc] initWithNibName:@"YourCartViewController" bundle:nil];
    yourCartViewController.title=@"Felton";
    [self.navigationController pushViewController:yourCartViewController animated:YES];
    [yourCartViewController release];
}
-(IBAction)deleteOrderButton_Tapped
{
    if(isPickerHidden)
    {
        datePicker.hidden=NO;
        isPickerHidden=NO;
    }
    else if(!isPickerHidden)
    {
        NSDate* pickerDate = [datePicker date];
        datePicker.hidden=YES;
        isPickerHidden=YES;
        for(SalesOrder* order in salesOrderArr)
    {
        NSDate* orderDate = order.Date;
        /*if([orderDate earlierDate:pickerDate])
        {
            order.isDeleted = YES;
        }*/
        switch([orderDate compare:pickerDate])
        {
            case NSOrderedAscending:
                order.isDeleted = YES;
                break;
            case NSOrderedSame:
                order.isDeleted = YES;
                break;
            case NSOrderedDescending:break;
        }
        KDSDataSalesOrder* tSaleOrder = [[KDSDataSalesOrder alloc] init];
        [tSaleOrder updateSaleOrderIsDeleted:order];
        [tSaleOrder release];
    }
    [self reloadNewOrderTable];
}
}
-(void)initializeTableData
{
    KDSAppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
    KDSDataSalesOrder *dataSalesOrder=[[KDSDataSalesOrder alloc] init];
    NSArray* tNewSalesOrderArr=[dataSalesOrder selectSalesOrdersforSalesPerson:appDelegate.loggedInSalesPerson IsUploaded:NO IsDeleted:NO];
    self.salesOrderArr=tNewSalesOrderArr;
    [dataSalesOrder release];
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    datePicker.hidden = YES;
    [super viewDidLoad];
    if(newOrderTableViewController == nil)
    {
        NewOrderTableViewController *tNewOrderTableViewController = [[NewOrderTableViewController alloc] init];
    self.newOrderTableViewController = tNewOrderTableViewController;
    self.newOrderTableViewController.orderListViewController=self;
    [tNewOrderTableViewController release];
}
if(transferedOrderViewController == nil)
{
    TransferedOrderTableViewController *tTransferedOrderTableViewController = [[TransferedOrderTableViewController alloc] init];
    self.transferedOrderViewController = tTransferedOrderTableViewController;
    [tTransferedOrderTableViewController release];
}

[newOrderTabelView setDataSource:self.newOrderTableViewController];
[newOrderTabelView setDelegate:self.newOrderTableViewController];

[transferedOrderTableView setDataSource:self.transferedOrderViewController];
[transferedOrderTableView setDelegate:self.transferedOrderViewController];

self.newOrderTableViewController.view = self.newOrderTableViewController.tableView;
self.transferedOrderViewController.view = self.transferedOrderViewController.tableView;

UIView *NewOrdeertableHeaderView = [[UIView alloc] initWithFrame:CGRectMake(newOrderTabelView.frame.origin.x, newOrderTabelView.frame.origin.y-30, self.newOrderTabelView.frame.size.width, 30)];
NewOrdeertableHeaderView.backgroundColor = [UIColor colorWithRed:0.0196 green:0.513 blue:0.949 alpha:1.0];

UILabel *NewOrderTableHeaderLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, self.newOrderTabelView.frame.size.width/2, 21)];
NewOrderTableHeaderLabel.text = @"New Order";
NewOrderTableHeaderLabel.backgroundColor = [UIColor clearColor];
NewOrderTableHeaderLabel.textColor = [UIColor whiteColor];
NewOrderTableHeaderLabel.textAlignment = UITextAlignmentLeft;
[NewOrdeertableHeaderView addSubview:NewOrderTableHeaderLabel];
newOrderTableViewHeader = NewOrdeertableHeaderView;
[self.view addSubview:newOrderTableViewHeader];

UIView *TransferedOrdertableHeaderView = [[UIView alloc] initWithFrame:CGRectMake(transferedOrderTableView.frame.origin.x, transferedOrderTableView.frame.origin.y-30, self.transferedOrderTableView.frame.size.width, 30)];
TransferedOrdertableHeaderView.backgroundColor = [UIColor colorWithRed:0.0196 green:0.513 blue:0.949 alpha:1.0];

UILabel *TransferedOrderTableHeaderLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, self.transferedOrderTableView.frame.size.width/2, 21)];
TransferedOrderTableHeaderLabel.text = @"Transfered Order";
TransferedOrderTableHeaderLabel.backgroundColor = [UIColor clearColor];
TransferedOrderTableHeaderLabel.textColor = [UIColor whiteColor];
TransferedOrderTableHeaderLabel.textAlignment = UITextAlignmentLeft;
[TransferedOrdertableHeaderView addSubview:TransferedOrderTableHeaderLabel];
transferedOrderTableViewHeader = TransferedOrdertableHeaderView;
[self.view addSubview:transferedOrderTableViewHeader];

[NewOrdeertableHeaderView release];
[NewOrderTableHeaderLabel release];
[TransferedOrdertableHeaderView release];
[TransferedOrderTableHeaderLabel release];    }
-(void)viewDidUnload
    {
        [super viewDidUnload];
        // Release any retained subviews of the main view.
        // e.g. self.myOutlet = nil;
    }

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}
-(void)reloadNewOrderTable
{
    [self initializeTableData];
    [self.newOrderTableViewController initializeTableData];
    [newOrderTabelView reloadData];
}
@end

对不起，如果代码搞砸了。问题发生在

NSDate* orderDate = order.Date;

订单来自SalesOrder，其中有一个NSDate，这个NSDate设置在客户确认订单的另一个地方，事情是当客户确认订单时，将保存在我的SalesOrder中的日期是正确的，但是当我尝试在上面的代码中分配它时，它会回到 1 天......可能我犯了一个错误并且在这里遗漏了一些简单的事实，在此先感谢您的帮助。

P.S：我还在其他一些地方（订单列表）向客户显示订单日期，并且那里的日期是正确的。

---

编辑：很好地抓住 Hot Licks，我得到的值是与订单相关的信息，当我将日期 NSString 分配给时，问题出现在下面的代码中NSDate 使用 dateFromString:

[NSDateFormatter *formatter=[[NSDateFormatter alloc] init];    
[formatter setDateFormat:@"YYYY/MM/dd hh:mm:ss"];                
NSString *orderDateStr=[NSString stringWithUTF8String:(char*)sqlite3_column_text(statement, 2)];    
NSDate *orderDate=[formatter dateFromString:orderDateStr];

orderDateStr 显示正确的订购日期，但orderDate 显示前一天。我以前从来没有遇到过这样的事情，有什么想法吗？ :)

Answer 1

我想知道您的日期格式是否包含最后的 +0000。尝试类似 [formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];在解析之前。