Question

我有三个日期＆＃39; startDate＆＃39;，stopDate和currentDate。我需要比较＆quot; startDate＆＃39; ＆lt; =＆＃39; currentDate＆＃39;并且＆＃39; stopDate＆＃39; ＆gt; =＆＃39; currentDate＆＃39;。我的代码。

unsigned int flagsDate = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;

    NSDateComponents* fromComponents = [[NSCalendar currentCalendar] components:flagsDate fromDate:startDate];
    NSDate* fromDateOnly = [[NSCalendar currentCalendar] dateFromComponents:fromComponents];

    NSDateComponents* toComponents = [[NSCalendar currentCalendar] components:flagsDate fromDate:stopDate];
    NSDate* toDateOnly = [[NSCalendar currentCalendar] dateFromComponents:toComponents];

    NSDate * currentDate = [NSDate date];
    NSDateComponents* currComponents = [[NSCalendar currentCalendar] components:flagsDate fromDate: currentDate];
    NSDate* currDateOnly = [[NSCalendar currentCalendar] dateFromComponents:currComponents];

    NSTimeInterval fromTime = [fromDateOnly timeIntervalSinceReferenceDate];
    NSTimeInterval toTime = [toDateOnly timeIntervalSinceReferenceDate];
    NSTimeInterval currTime = [currDateOnly timeIntervalSinceReferenceDate];

    NSLog(@"%@ %@",currentDate, currDateOnly);
    NSLog(@"%@ %@",startDate, fromDateOnly);
    NSLog(@"%@ %@",stopDate, toDateOnly);

带来nslog的是什么。

2014-04-10 23：59：53.280 Calendar [2148：90b] 2014-04-10 19:59:53 +0000 2014-04-09 20:00:00 +0000 2014-04-10 23：59：53.282日历[2148：90b] 2014-04-10 20:14:12 +0000 2014-04-10 20:00:00 +0000 2014-04-10 23：59：53.282日历[2148：90b] 2015-04-09 20:14:12 +0000 2015-04-09 20:00:00 +0000

如何比较日期？我需要在没有时间的情况下比较日期。如果时间少于20:00，为什么要更改日期？

Answer 1

NSTimeInterval distanceBetweenDates = [StartDate timeIntervalSinceDate：EndDate];

if (distanceBetweenDates > 0) {
    NSLog("Greather than ")
} else  if (distanceBetweenDates < 0) {
    NSLog("less than");
} else {
    NSLog("Equal");
}

Answer 2

Alexey，我建议你在项目中加入这个精彩的NSDate扩展：https://github.com/erica/NSDate-Extensions

然后您可以使用

- (NSInteger)distanceInDaysToDate:(NSDate *)anotherDate

并检查它是否＆lt; 0,0或＆gt; 0

Answer 3

如果您只想比较日期，请执行以下操作：

NSInteger flagsDate = (NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit);

NSDateComponents* fromComponents = [[NSCalendar currentCalendar] components:flagsDate fromDate:startDate];
NSDateComponents* toComponents = [[NSCalendar currentCalendar] components:flagsDate fromDate:stopDate];
NSDateComponents* currComponents = [[NSCalendar currentCalendar] components:flagsDate fromDate:cu];

NSComparisonResult firstComparison = [[fromComponents date] compare: [currComponents date]]; 
NSComparisonResult secondComparison = [[toComponents date] compare: [currComponents date]];

然后检查你的结果

if (firstComparison == NSOrderedDescending || firstComparison == NSOrderedSame) {}
if (secondComparison == NSOrderedSame || secondComparison == NSOrderedAscending) {}

比较三个日期

3 个答案: