如何向NSDate添加小时数?

我不完全确定您要做什么,但您可以通过使用以下命令向另一个NSDate添加以秒为单位的时间来创建NSDate对象:

- (id)dateByAddingTimeInterval:(NSTimeInterval)seconds

//例如,将当前时间增加8小时:

NSDate *mydate = [NSDate date];
NSTimeInterval secondsInEightHours = 8 * 60 * 60;
NSDate *dateEightHoursAhead = [mydate dateByAddingTimeInterval:secondsInEightHours];

自iOS 8以来,有更方便的 dateByAddingUnit :

//add 8 hours
let calendar = NSCalendar.autoupdatingCurrentCalendar()
newDate = calendar.dateByAddingUnit(.CalendarUnitHour, value: 8, toDate: originalDate, options: nil)

您可以简单地使用:

NSDate *incrementedDate = [NSDate dateWithTimeInterval:numberOfSeconds sinceDate:[NSDate date]];

NSDate*开始日期=datePicker.date;

    NSTimeInterval secondsInOneHours = 1 * 60 * 60;

    NSDate *dateOneHoursAhead = [startdate dateByAddingTimeInterval:secondsInOneHours];

    [dateformate setDateFormat:@"d-MMM-yy HH:mm:ss"];

    strDate = [dateformate stringFromDate:dateOneHoursAhead];

Swift 3.X

let calendar = NSCalendar.autoupdatingCurrent
let newDate = calendar.date(byAdding: .hour, value: 8, to: Date())