将NSDates天数设置为相同的值-Java 学习之路

我想比较2个特定的日子，但是，我想比较月份和年份，而不是天 . 例如，我有一个类似2016-08-16的日期，而其他日期如2016-08-10，我需要比较日期并获得平等，因为他们的月份相等 .

因此，我需要一种方法来使两个NSDates平等，所以我需要让2016-08-10成为2016-08-00 . 之后我也可以修改第二个日期并进行比较 .

我有简单的代码片段用于平等，但我认为它也考虑了几天和几小时等等：

if ([dateOld compare:dateNew] == NSOrderedDescending) {
        NSLog(@"date1 is later than date2");
    } else if ([dateOld compare:dateNew] == NSOrderedAscending) {
        NSLog(@"date1 is earlier than date2");
    } else {
        NSLog(@"dates are the same");
    }

为了使它工作，我需要“零”NSDates的日期和时间 . 有没有办法做到这一点？

2 回答

看到这个SO答案：Comparing certain components of NSDate?

NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger desiredComponents = (NSMonthCalendarUnit | NSYearCalendarUnit);

NSDate *firstDate = ...; // one date
NSDate *secondDate = ...; // the other date

NSDateComponents *firstComponents = [calendar components:desiredComponents fromDate:firstDate];
NSDateComponents *secondComponents = [calendar components:desiredComponents fromDate:secondDate];

NSDate *truncatedFirst = [calendar dateFromComponents:firstComponents];
NSDate *truncatedSecond = [calendar dateFromComponents:secondComponents];

NSComparisonResult result = [truncatedFirst compare:truncatedSecond];
if (result == NSOrderedAscending) {
  //firstDate is before secondDate
} else if (result == NSOrderedDescending) {
  //firstDate is after secondDate
}  else {
  //firstDate is the same month/year as secondDate
}

回复于 2024-05-12T08:19:03+08:00

如果你有两个日期，

NSDate *now = // some date
NSDate *other = // some other date

你可以做这个比较：

if ([[NSCalendar currentCalendar] compareDate:now toDate:other toUnitGranularity:NSCalendarUnitMonth] == NSOrderedSame) {
    NSLog(@"Same month");
} else {
    NSLog(@"Different month");
}

回复于 2024-05-12T08:19:03+08:00

将NSDates天数设置为相同的值

2 回答

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