如何获取从当前时间到 10:30 pm 每 30:00（30 分钟）的时间间隔

Question

需要帮助显示每 30 分钟的时间间隔，假设 current time is 11:45 am 然后

时间间隔应为：12:00 pm,12:30 pm,01:00 pm,01:30 pm,02:00 pm,02:30 pm......10:30 pm.

 NSString *time = @"10.30 pm";

     NSDate *date1;
        NSDate *date2;
        {
            NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
            [formatter setDateFormat:@"hh.mm a"];
            date1 = [formatter dateFromString:time];
            date2 = [formatter dateFromString:[formatter stringFromDate:[NSDate date]]];

        }
        NSTimeInterval interval = [date1 timeIntervalSinceDate: date2];//[date1 timeIntervalSince1970] - [date2 timeIntervalSince1970];
        int hour = interval / 3600;
        int minute = (int)interval % 3600 / 60;

        NSLog(@"%@ %dh %dm", interval<0?@"-":@"+", ABS(hour), ABS(minute));

此代码 returns 我当前时间和给定时间的差异我该如何进一步进行。

Answer 1

我会首先检查给定的开始时间是上午还是下午，之后，我会找到最近的（四舍五入）30 米的时间间隔，然后简单地加上 30 米，然后检查我是否在给定的停止时间，如果不增加计数器。

如果您想跟踪并return要打印的列表，您也可以将每个 30 米的间隔添加到列表中。

Answer 2

试试这个适合你的代码

NSDateFormatter *datefrmt = [[NSDateFormatter alloc] init];
[datefrmt setDateFormat:@"hh:mm a"];
NSDate* startingTime = [datefrmt dateFromString:startTime];
NSDate* endingTime = [datefrmt dateFromString:endTime];
NSLog(@"Starting time is %@", startingTime);
NSLog(@"Stop time is %@", endingTime);    
NSDate * addingTimeInterval;    
addingTimeInterval = [startingTime dateByAddingTimeInterval:1800];    
NSLog(@"Required output is %@", addingTimeInterval);

Answer 3

如果您得到的开始日期是当前日期和时间，那么结束日期会自动设置为 30 分钟使用 dateByAddingTimeInterval:，请参阅我的示例，

NSDate *startDate = [NSDate date];

然后设置结束日期在代码下方，

currentdate = startDate; //today
endingDate = [startDate dateByAddingTimeInterval:(60*60)/2]; // 60*60 is 1 hour.

以上方法自动计算当前时间到结束时间加30分钟。

希望对您有所帮助

Answer 4

你可以这样做，

NSString *startTime = @"02:00 AM";
NSString *endTime = @"11:00 AM";


NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
[timeFormat setDateFormat:@"hh:mm a"];
NSDate* fromTime = [timeFormat dateFromString:startTime];
NSDate* toTime = [timeFormat dateFromString:endTime];
NSDate *dateByAddingThirtyMinute ;
NSTimeInterval timeinterval = [toTime timeIntervalSinceDate:fromTime];
NSLog(@"time Int %f",timeinterval/3600);
float numberOfIntervals = timeinterval/3600;
NSLog(@"Start time %f",numberOfIntervals);

for(int iCount = 0;iCount < numberOfIntervals*2 ;iCount ++)
{
    dateByAddingThirtyMinute = [fromTime dateByAddingTimeInterval:1800];
    fromTime = dateByAddingThirtyMinute;
    NSString *formattedDateString;
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"hh:mm a"];
    formattedDateString = [dateFormatter stringFromDate:dateByAddingThirtyMinute];
    NSLog(@"Time after 30 min %@",formattedDateString);
}

在 for 循环中我采用了 numberOfIntervals*2 因为时间间隔是 30 min，所以 60/30 = 2 而你的 datebyAddingThirtyMinute 是 1800 因为 30 分钟 = 1800 秒。如果你想要每 10 分钟后的时间，那么它应该是 60/10 = 6，所以它应该是 numberOfIntervals*6。而你的 datebyAddingThirtyMinute 应该是 [fromTime dateByAddingTimeInterval:600];

希望这会有所帮助:)

Answer 5

最可靠的方法（还要考虑夏令时的变化）是使用 NSCalendar 的日期数学功能。

根本不推荐使用 dateByAddingTimeInterval 简单地添加秒数。

NSDate *now = [NSDate date];
NSCalendar *cal = [NSCalendar currentCalendar];
// get minute and hour from now
NSDateComponents *nowComponents = [cal components:NSCalendarUnitHour | NSCalendarUnitMinute fromDate: now];
NSDate *currentDate;
// if current minutes is not exactly 0 or 30 get back to the past half hour
if (nowComponents.minute % 30 != 0) {
   NSInteger pastHalfHourIndex = nowComponents.minute / 30;
   nowComponents.minute = pastHalfHourIndex * 30;
   currentDate = [cal nextDateAfterDate:now matchingHour: nowComponents.hour minute: nowComponents.minute second: 0 options: NSCalendarMatchNextTime | NSCalendarSearchBackwards];
} else {
   currentDate = now;
}    
NSMutableArray<NSDate *>* dates = [NSMutableArray array];
// loop and add 30 minutes until the end time (10:30 pm) is reached
while (nowComponents.minute != 30 || nowComponents.hour != 22) {
  currentDate = [cal dateByAddingUnit:NSCalendarUnitMinute value: 30 toDate: currentDate options: NSCalendarMatchNextTime];
  [dates addObject:currentDate];
  nowComponents = [cal components:NSCalendarUnitHour | NSCalendarUnitMinute fromDate: currentDate];
}
NSLog(@"%@", dates);

如何获取从当前时间到 10:30 pm 每 30:00（30 分钟）的时间间隔

How to get time interval for every 30:00(30 minutes) from current time to 10:30 pm

time

objective-c

nsdate

ios