Question

您知道如何知道两个NSDate是否在同一天。我想考虑一下语言环境......

使用timeIntervalSinceDate:可能很容易，但星期一23H58和星期二00H01不在同一天......

处理NSDate和语言环境进行计算并不容易。

Answer 1

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *componentsForFirstDate = [calendar components:NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:firstDate];

NSDateComponents *componentsForSecondDate = [calendar components:NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:secondDate];

if ([componentsForFirstDate year] == [componentsForSecondDate year])

等

我不知道isEquals是否会在NSDateComponents上执行您想要的操作。

Answer 2

从iOS 8开始，这很简单：

let isSameDay = NSCalendar.currentCalendar().isDate(date1, inSameDayAsDate: date2)

使用 Swift 3 ：

，它变得更简单了

let isSameDay = Calendar.current.isDate(date1, inSameDayAs: date2)

Answer 3

使用NSCalendar和NSDateComponents：

NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *comps1 = [cal components:(NSMonthCalendarUnit| NSYearCalendarUnit | NSDayCalendarUnit) 
                                      fromDate:date1];
NSDateComponents *comps2 = [cal components:(NSMonthCalendarUnit| NSYearCalendarUnit | NSDayCalendarUnit) 
                                      fromDate:date2];


BOOL sameDay = ([comps1 day] == [comps2 day] 
                  && [comps1 month] == [comps2 month] 
                  && [comps1 year] == [comps2 year]);

Answer 4

夫特：

func isSameDays(date1:NSDate, _ date2:NSDate) -> Bool {
    let calendar = NSCalendar.currentCalendar()
    var comps1 = calendar.components([NSCalendarUnit.Month , NSCalendarUnit.Year , NSCalendarUnit.Day], fromDate:date1)
    var comps2 = calendar.components([NSCalendarUnit.Month , NSCalendarUnit.Year , NSCalendarUnit.Day], fromDate:date2)

    return (comps1.day == comps2.day) && (comps1.month == comps2.month) && (comps1.year == comps2.year)
}

Answer 5

使用NSDateFormatter：

NSDateFormatter *_df = [[NSDateFormatter alloc] init];
_df.dateFormat = @"yyyy.MM.dd";
NSString *_d1 = [_df stringFromDate:_date1];
NSString *_d2 = [_df stringFromDate:_date2];
if ([_d1 isEqualToString:_d2] == YES)
{
    // d1 and d2 is on same day/month/year
}
[_df release];

Answer 6

如果您的应用仅在OS X 10.9+或iOS 8+上运行，则可以使用NSCalender的新API。

/*
    This API compares the given dates down to the given unit, reporting them equal if they are the same in the given unit and all larger units.
*/
- (BOOL)isDate:(NSDate *)date1 equalToDate:(NSDate *)date2 toUnitGranularity:(NSCalendarUnit)unit NS_AVAILABLE(10_9, 8_0);

还有很多方便的API。但是，Apple没有在他们的文档集中提到它们。无论如何，API是公开的，您可以使用它们。

Answer 7

如果日期不是系统区域设置，请设置timeZone。

NSCalendar *calendar = [NSCalendar currentCalendar];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:self.cityData.timeZone];
[calendar setTimeZone:timeZone];
NSDateComponents *componentsForFirstDate = [calendar components:NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:weatherDataDate];
NSDateComponents *componentsForSecondDate = [calendar components:NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:yesterday];            
if ([componentsForFirstDate day] == [componentsForSecondDate day]) {
    // TODO: 
}

如何知道两个NSDate是否在同一天

7 个答案: