Question

我的日期值日期：2013-06-07 18:30:00 +0000。我试图减去30分钟，但没有给出适当的时间。

我试过这个

 NSTimeInterval secondsPerHour = 60*30;
 NSDate *newDate = [date dateByAddingTimeInterval:-secondsPerHour];

Answer 1

原因：negative的{{1}}为unsigned int。这应该有效：

positive number

编辑：替代使用NSDate *newDate = [date dateByAddingTimeInterval:-(NSTimeInterval)((u_int32_t)30*60)];。

NSDateComponents

Answer 2

你可以使用：

NSDate *minusOneHr = [[NSDate date] dateByAddingTimeInterval:-30*60];

Answer 3

你可以尝试NSDateComponents，类似的东西：

NSDate* yourDate = [NSDate dateWithTimeIntervalSinceNow:0]; // your date, to substract 30 mins

NSDateComponents *dc = [[NSCalendar currentCalendar] components:(NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit |  NSHourCalendarUnit | NSMinuteCalendarUnit) fromDate:yourDate];
[dc setMinute:[dc minute] - 30];

NSDate* date  = [[NSCalendar currentCalendar] dateFromComponents:dc]; // 30 mins before now

或那：

NSDate* yourDate = [NSDate dateWithTimeIntervalSinceNow:0]; // your date, to substract 30 mins

NSDateComponents *components = [[NSDateComponents alloc] init];
[components setMinute:-30];

NSDate* date  = [[NSCalendar currentCalendar] dateByAddingComponents:components toDate:yourDate options:0]; // 30 mins before now

Answer 4

在viewDidLoad中复制粘贴此代码并首先检查结果。

NSDate *today = [[NSDate alloc] init];
    NSLog(@"Today %@", today);
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
    [offsetComponents setMinute:-30]; // If you want to change Month,Year,Day,Hour etc. Just change the "setMinute" to setMonth,setYear,setDay,setHour
    NSDate *dateComp = [gregorian dateByAddingComponents:offsetComponents toDate:today options:0];
    NSLog(@"Desired Day %@", dateComp);

Answer 5

在 Swift 5 中

let minus30Min = Date().addingTimeInterval(-30 * 60)

Answer 6

let dateMinusThirtyMinutes = Date().subtract(30.minutes)

如何从日期减去30分钟

6 个答案: