如何以整数格式获取NSDate日，月和年

Question

我想以整数形式获取NSDate的日、月和年分量，即如果日期是 1/2/1988，那么我应该分别得到 1、2 和 1988 作为整数。如何在 iOS 中执行此操作？我发现了类似的问题，但该方法descriptionWithCalendarFormat：发出警告，现在似乎已弃用。

Answer 1

你来了，

NSDate *currentDate = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:currentDate]; // Get necessary date components
 [components month]; //gives you month
 [components day]; //gives you day
 [components year]; // gives you year

您可以使用 NSDateComponents 实现上述操作。

请访问此页面了解详情。

Answer 2

是的，通过使用NSCalendar，我认为这将使您的工作。

NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:[NSDate date]];
NSInteger day = [components day];    
NSInteger month = [components month];
NSInteger year = [components year];

Answer 3

Swift

let components = NSCalendar.currentCalendar().components([.Day, .Month, .Year], fromDate: self)
let day = components.day
let month = components.month
let year = components.year

为了方便起见，你可以把它放在一个NSDate扩展中，并让它返回一个元组：

extension NSDate: Comparable {
    var dayMonthYear: (Int, Int, Int) {
        let components = NSCalendar.currentCalendar().components([.Day, .Month, .Year], fromDate: self)
        return (components.day, components.month, components.year)
    }
}

现在你只需要写：

let (day, month, year) = date.dayMonthYear

例如，如果你想只得到你可以写的年份：

let (_, _, year) = date.dayMonthYear

Answer 4

你可以使用 NSDateComponents 来获取这个，

NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
NSDate *currDate = [NSDate date];
NSDateComponents *dComp = [calendar components:( NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit ) 
                                      fromDate:currDate];
int day = [dComp day];
int month = [dComp month];
int year = [dComp year];

Answer 5

把它放在一个扩展中，过你的生活 🍸🏖

extension Date{
    var day:Int {return Calendar.current.component(.day, from:self)}
    var month:Int {return Calendar.current.component(.month, from:self)}
    var year:Int {return Calendar.current.component(.year, from:self)}
}
Date().day//22
Date().month//4
Date().year//2017

Swift 3.0(这是以前答案的迭代，但可以解决您未来所有应用程序项目的问题(

Answer 6

对于那些像我一样直接从网络上复制和粘贴的人来说，这是iOS 8的一个小更新

NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:[NSDate date]];
[components day]; //Day
[components month];//Month
[components year];//Year

区别在于NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay NSMonthCalendarUnit | NSDayCalendarUnit | NSYearCalendarUnit | NSWeekdayCalendarUnit已被弃用

Answer 7

你可以试试这个......

Mycal = [NSCalendar currentCalendar];
today = [NSDate date];
compA =[Mycal components:(NSMonthCalendarUnit | NSDayCalendarUnit | NSYearCalendarUnit | NSWeekdayCalendarUnit) fromDate:today];     
FirstDateofMonth=[today dateByAddingTimeInterval:([compA day]-1)*(-24*60*60)];
compA =[Mycal components:(NSMonthCalendarUnit | NSDayCalendarUnit | NSYearCalendarUnit | NSWeekdayCalendarUnit) fromDate:FirstDateofMonth];
today = FirstDateofMonth;
compA = [Mycal components:(NSMonthCalendarUnit | NSDayCalendarUnit | NSYearCalendarUnit | NSWeekdayCalendarUnit) fromDate:today];
[compA setMonth:([compA month])];
[self DrawMonthInPortraitView];
[compA retain];

Answer 8

NSDate *currentDate = [NSDate date];
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:currentDate]; // Get necessary date components
[components month]; //gives you month
[components day]; //gives you day
[components year]; // gives you year
NSString *temp=[NSString stringWithFormat:@"Months:%d Day:%d Year:%d",[components month],  [components day],[components year]];
NSLog(@"%@",temp);

Answer 9

let date = Date()
let calendar = Calendar.current
let year = calendar.component(.year, from: date)
let month = calendar.component(.month, from: date)
let day = calendar.component(.day, from: date)
print("hours = (year):(month):(day)")