NSDate NSCalendarのdateFromComponent

Question

で、私はこのコードの問題を抱えていることは：

+ (NSDate *)dateByMovingToBeginningOfDay:(NSDate *)date 
{ 
    unsigned int flags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; 

    NSDateComponents* parts = [[NSCalendar currentCalendar] components:flags fromDate:date]; 
    [parts setHour:0]; 
    [parts setMinute:0]; 
    [parts setSecond:0]; 

    return [[NSCalendar currentCalendar] dateFromComponents:parts]; 
} 

+ (NSDate *)dateByMovingToEndOfDay:(NSDate *)date 
{ 
    unsigned int flags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; 

    NSDateComponents *parts = [[NSCalendar currentCalendar] components:flags fromDate:date]; 
    [parts setHour:23]; 
    [parts setMinute:59]; 
    [parts setSecond:59]; 

    return [[NSCalendar currentCalendar] dateFromComponents:parts]; 
} 

+ (BOOL)checkForReportInDate:(NSDate *)date forUser:(User *)user 
{ 
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; 
    NSManagedObjectContext *context = appDelegate.managedObjectContext; 

    NSDate *startDate = [NSDate dateByMovingToBeginningOfDay:date]; 
    NSDate *endDate = [NSDate dateByMovingToEndOfDay:date]; 

    NSLog(@"apply date: %@", date.description); 
    NSLog(@"start date: %@", startDate.description); 
    NSLog(@"end date: %@", endDate.description); 

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 
    fetchRequest.entity = [NSEntityDescription entityForName:@"Report" inManagedObjectContext:context]; 
    fetchRequest.predicate = [NSPredicate predicateWithFormat:@"user == %@ AND (date > %@ AND date < %@)", user, startDate, endDate]; 
    fetchRequest.fetchLimit = 1; 

    NSError *error = nil; 

    NSUInteger reportExist = [context countForFetchRequest:fetchRequest error:&error]; 

    if(error != nil) { 
     NSLog(@"Error: %@", [error localizedDescription]); 
     return NO; 
    } 

    if(reportExist > 0) { 
     return 1; 
    } 
    else { 
     return 0; 
    } 
} 

それは私のコンソールに私が

2012-04-12午後02時34分を持っている...間違った開始日を生成します。 46.456 iFood Pro [23820：fb03]レポートをデータベースに保存 2012-04-12 14：34：46.458 iFood Pro [23820：fb03]適用日：2012-04-12 12:34:41 +0000 2012-04-12 12 14：34：46.458 iFood Pro [23820：fb03]開始日：2012-04-11 22:00:00 +0000 2012-04-12 14：34：46.459 iFood Pro [23820：fb03]終了日：2012 -04-12 21:59:59 +0000

開始日は、2012-04-11 22:00:00 +0000の代わりに2012-04-12 00:00:00 +0000にする必要があります。 この現象はなぜ発生しますか？私は心配しています！固定

Answer 1

、問題は時間帯だった... using [parts setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];が問題