基本上,就像标题说的那样。我想知道如何添加1天的NSDate。
如果它是:
21st February 2011
它将变成:
22nd February 2011
或者如果它是:
31st December 2011
它将变成:
1st January 2012.
基本上,就像标题说的那样。我想知道如何添加1天的NSDate。
如果它是:
21st February 2011
它将变成:
22nd February 2011
或者如果它是:
31st December 2011
它将变成:
1st January 2012.
当前回答
在swift中,您可以在NSDate中添加扩展方法
extension NSDate {
func addNoOfDays(noOfDays:Int) -> NSDate! {
let cal:NSCalendar = NSCalendar.currentCalendar()
cal.timeZone = NSTimeZone(abbreviation: "UTC")!
let comps:NSDateComponents = NSDateComponents()
comps.day = noOfDays
return cal.dateByAddingComponents(comps, toDate: self, options: nil)
}
}
你可以用这个
NSDate().addNoOfDays(3)
其他回答
Swift 5.0:
var dayComponent = DateComponents()
dayComponent.day = 1 // For removing one day (yesterday): -1
let theCalendar = Calendar.current
let nextDate = theCalendar.date(byAdding: dayComponent, to: Date())
print("nextDate : \(nextDate)")
目标C:
NSDateComponents *dayComponent = [[NSDateComponents alloc] init];
dayComponent.day = 1;
NSCalendar *theCalendar = [NSCalendar currentCalendar];
NSDate *nextDate = [theCalendar dateByAddingComponents:dayComponent toDate:[NSDate date] options:0];
NSLog(@"nextDate: %@ ...", nextDate);
这应该是不言而喻的。
只是为了好玩,通过一些扩展和操作符重载,你可以得到一些不错的东西,比如:
let today = Date()
let tomorrow = today + 1.days
, or
var date = Date()
date += 1.months
下面是支持代码:
extension Calendar {
struct ComponentWithValue {
let component: Component
let value: Int
}
}
extension Int {
var days: Calendar.ComponentWithValue {
.init(component: .day, value: self)
}
var months: Calendar.ComponentWithValue {
.init(component: .month, value: self)
}
}
func +(_ date: Date, _ amount: Calendar.ComponentWithValue) -> Date {
Calendar.current.date(byAdding: amount.component, value: amount.value, to: date)!
}
func +(_ amount: Calendar.ComponentWithValue, _ date: Date) -> Date {
date + amount
}
func +=(_ date: inout Date, _ amount: Calendar.ComponentWithValue) {
date = date + amount
}
代码是最少的,并且可以很容易地扩展到允许.月,.年,.小时等。还可以无缝添加对减法(-)的支持。
虽然在+操作符的实现中有一个强制的展开,但是不确定在哪种情况下日历可以返回nil日期。
字符串扩展:转换String_Date >日期
extension String{
func DateConvert(oldFormat:String)->Date{ // format example: yyyy-MM-dd HH:mm:ss
let isoDate = self
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX") // set locale to reliable US_POSIX
dateFormatter.dateFormat = oldFormat
return dateFormatter.date(from:isoDate)!
}
}
日期扩展:转换日期>字符串
extension Date{
func DateConvert(_ newFormat:String)-> String{
let formatter = DateFormatter()
formatter.dateFormat = newFormat
return formatter.string(from: self)
}
}
日期扩展:获取+/-日期
extension String{
func next(day:Int)->Date{
var dayComponent = DateComponents()
dayComponent.day = day
let theCalendar = Calendar.current
let nextDate = theCalendar.date(byAdding: dayComponent, to: Date())
return nextDate!
}
func past(day:Int)->Date{
var pastCount = day
if(pastCount>0){
pastCount = day * -1
}
var dayComponent = DateComponents()
dayComponent.day = pastCount
let theCalendar = Calendar.current
let nextDate = theCalendar.date(byAdding: dayComponent, to: Date())
return nextDate!
}
}
用法:
let today = Date()
let todayString = "2020-02-02 23:00:00"
let newDate = today.DateConvert("yyyy-MM-dd HH:mm:ss") //2020-02-02 23:00:00
let newToday = todayString.DateConvert(oldFormat: "yyyy-MM-dd HH:mm:ss")//2020-02-02
let newDatePlus = today.next(day: 1)//2020-02-03 23:00:00
let newDateMinus = today.past(day: 1)//2020-02-01 23:00:00
参考:来自多重问题 我如何添加1天到一个NSDate? 数学函数转换正整数为负和负到正? 将NSString转换为NSDate(然后再转换回来)
我也有同样的问题;使用NSDate扩展:
- (id)dateByAddingYears:(NSUInteger)years
months:(NSUInteger)months
days:(NSUInteger)days
hours:(NSUInteger)hours
minutes:(NSUInteger)minutes
seconds:(NSUInteger)seconds
{
NSDateComponents * delta = [[[NSDateComponents alloc] init] autorelease];
NSCalendar * gregorian = [[[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian] autorelease];
[delta setYear:years];
[delta setMonth:months];
[delta setDay:days];
[delta setHour:hours];
[delta setMinute:minutes];
[delta setSecond:seconds];
return [gregorian dateByAddingComponents:delta toDate:self options:0];
}
Swift 4,如果你真正需要的是24小时轮班(60*60*24秒)而不是“1个日历天”
未来: let dayAhead = Date(timeIntervalSinceNow: TimeInterval(86400.0))
过去: let dayAgo = Date(timeIntervalSinceNow: TimeInterval(-86400.0))