NSDate 的问题

Question

我有一个格式为 2018-01-19 18:30:00 +0000 的 NSDate 对象。现在我只想更改时间组件。更改时间组件后，NSDate 对象将为 2018-01-19 10:00:00。我确实尝试了各种解决方案，但没有任何效果。如果有人对此问题有任何解决方案，请提供帮助。提前谢谢你

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components: NSCalendarUnitYear| NSCalendarUnitMonth| NSCalendarUnitDay fromDate:date];

[components setHour:hour];
[components setMinute:minute];
[components setSecond:second];
NSDate *newDate = [calendar dateFromComponents:components];

我尝试的另一个解决方案是

  NSDate *oldDate = date; 
  unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay;
  NSCalendar *calendar = [NSCalendar currentCalendar];
  NSDateComponents *comps = [calendar components:unitFlags fromDate:oldDate];
  comps.hour   = 10;   
  comps.minute = 00;
  comps.second = 00;
  NSDate *newDate = [calendar dateFromComponents:comps];

每次我得到输出都是输入日期的下一个日期

Answer 1

您可以在创建新的 NSDate 对象时更改时间组件：

NSDate *date = [calendar dateBySettingHour:10 minute:0 second:0 ofDate:[NSDate date] options:0];

答案来自：https://stackoverflow.com/a/5611700/4535184

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Answer 2

这是您的代码，只需添加 dateformater 来格式化日期

NSDate *oldDate = [[NSDate alloc]init];
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comps = [calendar components:unitFlags fromDate:oldDate];
comps.hour   = 10;
comps.minute = 00;
comps.second = 00;
NSDate *newDate = [calendar dateFromComponents:comps];
NSDateFormatter *formater = [[NSDateFormatter alloc]init];
formater.dateFormat = @"YYYY-MM-dd hh:mm:ss";
NSLog(@"New Date : %@",[formater stringFromDate:newDate]);

Answer 3

试试这个

NSDateFormatter *formatter = [NSDateFormatter new];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss zzzz"];
NSDate *date = [formatter dateFromString:@"2018-01-19 18:30:00 +0000"];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components: NSCalendarUnitDay| NSCalendarUnitHour| NSCalendarUnitMinute|NSCalendarUnitDay|NSCalendarUnitMonth|NSCalendarUnitYear  fromDate:date];
[components setHour:10];
[components setMinute:0];
[components setSecond:0];
NSDate *newDate = [calendar dateFromComponents:components];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSLog(@"%@",[formatter stringFromDate:newDate]);