在iOS中如何计算两个约会之间的时间(以小时为单位)

How can I calculate the time elapsed in hours between two times (possibly occurring on different days) in iOS?

在iOS中，我如何计算2次(可能在不同的天数)之间的小时间隔?

5 个解决方案

#1

155

The NSDate function timeIntervalSinceDate: will give you the difference of two dates in seconds.

NSDate函数timeIntervalSinceDate:将在几秒内给出两个日期的差值。

 NSDate* date1 = someDate;
 NSDate* date2 = someOtherDate;
 NSTimeInterval distanceBetweenDates = [date1 timeIntervalSinceDate:date2];
 double secondsInAnHour = 3600;
 NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;

See, the apple reference library http://developer.apple.com/library/mac/navigation/ or if you are using Xcode just select help/documentation from the menu.

看，苹果参考库http://developer.apple.com/library/mac/navigation/或者如果您正在使用Xcode，请从菜单中选择help/documentation。

See: how-to-convert-an-nstimeinterval-seconds-into-minutes

看:how-to-convert-an-nstimeinterval-seconds-into-minutes

--edit: See ÐąrέÐέvil's answer below for correctly handling daylight savings/leap seconds

——编辑:见下面的ÐąrέÐέvil的回答正确处理夏令时/闰秒

#2

NSCalendar *c = [NSCalendar currentCalendar];
NSDate *d1 = [NSDate date];
NSDate *d2 = [NSDate dateWithTimeIntervalSince1970:1340323201];//2012-06-22
NSDateComponents *components = [c components:NSHourCalendarUnit fromDate:d2 toDate:d1 options:0];
NSInteger diff = components.minute;

NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit

Change needed components to day, hour or minute, which difference you want. If NSDayCalendarUnit is selected then it'll return the number of days between two dates similarly for NSHourCalendarUnit and NSMinuteCalendarUnit

将需要的组件更改为一天、一小时或一分钟，这是你想要的。如果选择了NSDayCalendarUnit，那么对于nshourcalendar arunit和NSMinuteCalendarUnit，它将返回两个日期之间的天数

Swift 4 version

斯威夫特4版

let cal = Calendar.current
let d1 = Date()
let d2 = Date.init(timeIntervalSince1970: 1524787200) // April 27, 2018 12:00:00 AM
let components = cal.dateComponents([.hour], from: d2, to: d1)
let diff = components.hour!

#3

-(NSMutableString*) timeLeftSinceDate: (NSDate *) dateT {

    NSMutableString *timeLeft = [[NSMutableString alloc]init];

    NSDate *today10am =[NSDate date];

    NSInteger seconds = [today10am timeIntervalSinceDate:dateT];

    NSInteger days = (int) (floor(seconds / (3600 * 24)));
    if(days) seconds -= days * 3600 * 24;

    NSInteger hours = (int) (floor(seconds / 3600));
    if(hours) seconds -= hours * 3600;

    NSInteger minutes = (int) (floor(seconds / 60));
    if(minutes) seconds -= minutes * 60;

    if(days) {
        [timeLeft appendString:[NSString stringWithFormat:@"%ld Days", (long)days*-1]];
    }

    if(hours) {
        [timeLeft appendString:[NSString stringWithFormat: @"%ld H", (long)hours*-1]];
    }

    if(minutes) {
        [timeLeft appendString: [NSString stringWithFormat: @"%ld M",(long)minutes*-1]];
    }

    if(seconds) {
        [timeLeft appendString:[NSString stringWithFormat: @"%lds", (long)seconds*-1]];
    }

    return timeLeft;
}

#4

Checkout : It takes care of daylight saving, leap year as it used iOS calendar to calculate. You can change the string and conditions to includes minutes with hours and days.

结帐:它负责日光节约，闰年，因为它使用iOS日历计算。你可以改变弦和条件，包括分钟，小时和天。

+(NSString*)remaningTime:(NSDate*)startDate endDate:(NSDate*)endDate {

    NSDateComponents *components;
    NSInteger days;
    NSInteger hour;
    NSInteger minutes;
    NSString *durationString;

    components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute
                                                 fromDate: startDate toDate: endDate options: 0];
    days = [components day];
    hour = [components hour];
    minutes = [components minute];

    if (days > 0) {

        if (days > 1) {
            durationString = [NSString stringWithFormat:@"%d days", days];
        }
        else {
            durationString = [NSString stringWithFormat:@"%d day", days];
        }
        return durationString;
    }

    if (hour > 0) {

        if (hour > 1) {
            durationString = [NSString stringWithFormat:@"%d hours", hour];
        }
        else {
            durationString = [NSString stringWithFormat:@"%d hour", hour];
        }
        return durationString;
    }

    if (minutes > 0) {

        if (minutes > 1) {
            durationString = [NSString stringWithFormat:@"%d minutes", minutes];
        }
        else {
            durationString = [NSString stringWithFormat:@"%d minute", minutes];
        }
        return durationString;
    }

    return @"";
}

#5

For those who use swift 3 and above,

对于使用swift 3及以上的用户，

    let dateString1 = "2018-03-15T14:20:00.000Z"
    let dateString2 = "2018-03-20T14:20:00.000Z"

    let Dateformatter = DateFormatter()
    Dateformatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"

    let date1 = Dateformatter.date(from: dateString1)
    let date2 = Dateformatter.date(from: dateString2)

    let distanceBetweenDates: TimeInterval? = date2?.timeIntervalSince(date1!)
    let secondsInAnHour: Double = 3600
    let secondsInDays: Double = 86400
    let secondsInWeek: Double = 604800

    let hoursBetweenDates = Int((distanceBetweenDates! / secondsInAnHour))
    let daysBetweenDates = Int((distanceBetweenDates! / secondsInDays))
    let weekBetweenDates = Int((distanceBetweenDates! / secondsInWeek))

    print(weekBetweenDates,"weeks")//0 weeks
    print(daysBetweenDates,"days")//5 days
    print(hoursBetweenDates,"hours")//120 hours

#1

155