如何比较iOS中的系统日期和UIDatePicker日期？

Question

通过我的应用程序，用户可以在餐厅订购特定的食品。问题是，如果用户想要订购特定的产品，他可以给餐厅至少 6 小时的时间来提供 product.For 示例你是用户，现在时间是 12:00pm..在应用程序中，如果用户 selects 在 [=] 之前，用户可以 select 通过 UIDatepicker.Here 交付时间18=]，一个警报视图将生成消息 "please give 6hrs time for your order"。这里我必须比较系统时间和 UIDatepickers time.I 找到一种方法，但它没有用。

if ([self.datePicker.date compare:currentdate] == NSOrderedDescending){
   NSLog(@"Descending");
}

请帮助我...提前致谢

Answer 1

使用这个

if ([[NSDate date] isEqualToDate: currentdate) {
NSLog(@"currentDate is equal to currentdate"); 
}

Answer 2

或者你可以通过

比较选择的时间

NSDate *date1 = [NSDate date];
NSDate *date2 = datePicker.date;

NSTimeInterval elapsed = [date1 timeIntervalSinceDate:date2];

您还可以在 6 小时后设置日期选择器的最短时间

NSDate *mydate = [NSDate date];
NSTimeInterval secondsInSixHours = 6 * 60 * 60;
NSDate *dateSixHoursAhead = [mydate dateByAddingTimeInterval:secondsInSixHours];
[datePicker setMinimumDate:dateSixHoursAhead];

Answer 3

你实际上是在寻找时差，这里是代码：

NSLog(@"please give %@fhrs time for your order",[self.datePicker.date timeIntervalSinceDate:[NSDate date]]);

Answer 4

使用这个方法。比较两个日期的最佳方式：

- (void)pickerDateIsSmallerThanCurrent:(NSDate *)checkDate
    {
        NSDate* enddate = checkDate;
        NSDate* currentdate = [NSDate date];
        NSTimeInterval distanceBetweenDates = [enddate timeIntervalSinceDate:currentdate];
        double secondsInMinute = 60;
        NSInteger secondsBetweenDates = distanceBetweenDates / secondsInMinute;

        if (secondsBetweenDates == 0)
             //both dates are equal
        else if (secondsBetweenDates < 0)
             //selected date is smaller than current date
        else
            //selected date is greater than current date
    }

如何比较iOS中的系统日期和UIDatePicker日期？

How to compare system date with UIDatePicker's date in iOS?

iphone

uidatepicker

ios