iphone - 如何在ios中检查两个日期之间的当前日期？

Question

我有两个日期，开始日期和结束日期。现在我想检查我当前的日期是否在这两个日期之间。

例如开始日期：2013-09-17 15:05:00 +0000 结束日期：013-09-25 17:05:00 +0000

Answer 1

NSComparisonResult result,restult2; 
//has three possible values: NSOrderedSame,NSOrderedDescending, NSOrderedAscending

result = [currentDate compare:startDate]; // comparing two dates
result2 = [currentDate compare:endDate]; // comparing two dates

if(result==NSOrderedAscending && result==NSOrderedDescending)
{

NSLog(@"Between the StartDate and Enddate");

}

Answer 2

这是我写的一个方法：

- (NSInteger)daysBetweenDate:(NSDate*)fromDateTime andDate:(NSDate*)toDateTime {
    NSDate *fromDate;
    NSDate *toDate;
    NSCalendar *calendar = [NSCalendar currentCalendar];
    [calendar rangeOfUnit:NSDayCalendarUnit startDate:&fromDate
                 interval:NULL forDate:fromDateTime];
    [calendar rangeOfUnit:NSDayCalendarUnit startDate:&toDate
                 interval:NULL forDate:toDateTime];
    NSDateComponents *differenceComponents = [calendar components:NSDayCalendarUnit
                                                         fromDate:fromDate
                                                          toDate:toDate
                                                         options:0];
    return [differenceComponents day];
}

它计算两个日期之间的天数。您可以使用它来计算间隔，然后再次使用它来计算第三个日期（您要检查的日期）是否在您感兴趣的间隔内。

Answer 3

NSDateFormatter *formate = [[NSDateFormatter alloc] init];
[formate setDateFormat:@"dd-MM-yyyy"];--> this line first set type of formate to compare
NSDate *date1 = [formate dateFromString:@"1-5-2010"];-->first date
NSDate *date2 = [formate dateFromString:@"7-5-2010"];-->second date
//difference between dates in miliseconds
NSTimeInterval interval = [date1 timeIntervalSinceDate:date2];

//compare two dates 
NSComparisonResult result = [date1 compare:date2];
switch (result)
{
    case NSOrderedAscending: NSLog(@"%@ is greater than %@", date2, date1); break;
    case NSOrderedDescending: NSLog(@"%@ is less %@", date2, date1); break;
    case NSOrderedSame: NSLog(@"%@ is equal to %@", date2, date1); break;
    default: NSLog(@"erorr dates %@, %@", date2, date1); break;
}