NSDate 개체에 달을 추가하는 방법?
NSDate *someDate = [NSDate Date] + 30Days.....;
답변
NSDateComponents 를 사용해야합니다 .
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setMonth:1];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *newDate = [calendar dateByAddingComponents:dateComponents toDate:originalDate options:0];
[dateComponents release]; // If ARC is not used, release the date components
답변
iOS 8 및 OS X 10.9에서는 다음을 NSCalendarUnits사용하여 추가 할 수 있습니다 NSCalendar.
목표 -C
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *someDate = [cal dateByAddingUnit:NSCalendarUnitMonth value:1 toDate:[NSDate date] options:0];
스위프트 3
let date = Calendar.current.date(byAdding: .month, value: 1, to: Date())
스위프트 2
let cal = NSCalendar.currentCalendar()
let date = cal.dateByAddingUnit(.Month, value: 1, toDate: NSDate(), options: [])
답변
신속한 3.0 용
extension Date {
func addMonth(n: Int) -> Date {
let cal = NSCalendar.current
return cal.date(byAdding: .month, value: n, to: self)!
}
func addDay(n: Int) -> Date {
let cal = NSCalendar.current
return cal.date(byAdding: .day, value: n, to: self)!
}
func addSec(n: Int) -> Date {
let cal = NSCalendar.current
return cal.date(byAdding: .second, value: n, to: self)!
}
}
답변
예를 들어 3Swift에서 현재 날짜에 월 을 추가 하려면 :
let date = NSCalendar.currentCalendar().dateByAddingUnit(.MonthCalendarUnit, value: 3, toDate: NSDate(), options: nil)!
Swift 2.0에서 :
let date = NSCalendar.currentCalendar().dateByAddingUnit(.Month, value: 3, toDate: NSDate(), options: [])
- 새로운
OptionSetType구조NSCalendarUnit사용하면.Month - 취하는 매개 변수
OptionSetType(예 :options:취하는 매개 변수NSCalendarOptions)는 일 수 없으므로nil빈 집합 ([])을 전달하여 “옵션 없음”을 나타냅니다.
답변
Swift 2.0에서
let startDate = NSDate()
let dateComponent = NSDateComponents()
dateComponent.month = 1
let cal = NSCalendar.currentCalendar()
let endDate = cal.dateByAddingComponents(dateComponent, toDate: startDate, options: NSCalendarOptions(rawValue: 0))
답변
SWIFT 3.0 용
여기에 기능이 있습니다. 예를 들어 여기와 같이 일, 월, 일을 줄일 수 있습니다. 예를 들어 여기와 같이 현재 시스템 날짜의 연도를 100 년으로 줄였습니다. 일, 월에 대해 할 수 있으며 카운터를 설정 한 다음 값을 저장하십시오 배열에서 원하는 작업을 수행합니다.
func currentTime(){
let date = Date()
let calendar = Calendar.current
var year = calendar.component(.year, from: date)
let month = calendar.component(.month, from: date)
let day = calendar.component(.day, from: date)
let pastyear = year - 100
var someInts = [Int]()
printLog(msg: "\(day):\(month):\(year)" )
for _ in pastyear...year {
year -= 1
print("\(year) ")
someInts.append(year)
}
print(someInts)
}
답변
원하는 행동이 한 달을 추가하고 일광 절약 시간을 허용하는 경우 다른 답변이 제대로 작동합니다. 결과는 다음과 같습니다.
01/03/2017 00:00 + 1 month -> 31/03/2017 23:00
01/10/2017 00:00 + 1 month -> 01/11/2017 01:00
그러나 나는 DST가 잃거나 얻은 시간을 무시하고 싶었습니다.
01/03/2017 00:00 + 1 month -> 01/04/2017 00:00
01/10/2017 00:00 + 1 month -> 01/11/2017 00:00
따라서 DST 경계가 통과되었는지 확인하고 그에 따라 시간을 더하거나 뺍니다.
func offsetDaylightSavingsTime() -> Date {
// daylightSavingTimeOffset is either + 1hr or + 0hr. To offset DST for a given date, we need to add an hour or subtract an hour
// +1hr -> +1hr
// +0hr -> -1hr
// offset = (daylightSavingTimeOffset * 2) - 1 hour
let daylightSavingsTimeOffset = TimeZone.current.daylightSavingTimeOffset(for: self)
let oneHour = TimeInterval(3600)
let offset = (daylightSavingsTimeOffset * 2) - oneHour
return self.addingTimeInterval(offset)
}
func isBetweeen(date date1: Date, andDate date2: Date) -> Bool {
return date1.compare(self).rawValue * self.compare(date2).rawValue >= 0
}
func offsetDaylightSavingsTimeIfNecessary(nextDate: Date) -> Date {
if let nextDST = TimeZone.current.nextDaylightSavingTimeTransition(after: self) {
if nextDST.isBetweeen(date: self, andDate: nextDate){
let offsetDate = nextDate.offsetDaylightSavingsTime()
let difference = offsetDate.timeIntervalSince(nextDate)
return nextDate.addingTimeInterval(difference)
}
}
return nextDate
}
func dateByAddingMonths(_ months: Int) -> Date? {
if let dateWithMonthsAdded = Calendar.current.date(byAdding: .month, value: months, to: self) {
return self.offsetDaylightSavingsTimeIfNecessary(nextDate: dateWithMonthsAdded)
}
return self
}
테스트:
func testDateByAddingMonths() {
let date1 = "2017-01-01T00:00:00Z".asDate()
let date2 = "2017-02-01T00:00:00Z".asDate()
let date3 = "2017-03-01T00:00:00Z".asDate()
let date4 = "2017-04-01T00:00:00Z".asDate()
let date5 = "2017-05-01T00:00:00Z".asDate()
let date6 = "2017-06-01T00:00:00Z".asDate()
let date7 = "2017-07-01T00:00:00Z".asDate()
let date8 = "2017-08-01T00:00:00Z".asDate()
let date9 = "2017-09-01T00:00:00Z".asDate()
let date10 = "2017-10-01T00:00:00Z".asDate()
let date11 = "2017-11-01T00:00:00Z".asDate()
let date12 = "2017-12-01T00:00:00Z".asDate()
let date13 = "2018-01-01T00:00:00Z".asDate()
let date14 = "2018-02-01T00:00:00Z".asDate()
var testDate = "2017-01-01T00:00:00Z".asDate()
XCTAssertEqual(testDate, date1)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date2)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date3)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date4)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date5)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date6)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date7)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date8)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date9)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date10)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date11)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date12)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date13)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date14)
}
완전성을 위해 사용중인 .asDate () 메서드
extension String {
static let dateFormatter = DateFormatter()
func checkIsValidDate() -> Bool {
return self.tryParseToDate() != nil
}
func tryParseToDate() -> Date? {
String.dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
return String.dateFormatter.date(from: self)
}
func asDate() -> Date {
return tryParseToDate()!
}
}
