NSDateオブジェクトに月を追加する方法は?
NSDate *someDate = [NSDate Date] + 30Days.....;
NSDateComponentsを使用する必要があります。
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
IOS 8およびOS X 10.9では、NSCalendarUnits
を使用してNSCalendar
を追加できます。
Objective-C
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *someDate = [cal dateByAddingUnit:NSCalendarUnitMonth value:1 toDate:[NSDate date] options:0];
スイフト3
let date = Calendar.current.date(byAdding: .month, value: 1, to: Date())
スイフト2
let cal = NSCalendar.currentCalendar()
let date = cal.dateByAddingUnit(.Month, value: 1, toDate: NSDate(), options: [])
Swift 3.0
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)!
}
}
たとえば、Swiftの現在の日付に_3
_か月を追加するには:
_let date = NSCalendar.currentCalendar().dateByAddingUnit(.MonthCalendarUnit, value: 3, toDate: NSDate(), options: nil)!
_
_let date = NSCalendar.currentCalendar().dateByAddingUnit(.Month, value: 3, toDate: NSDate(), options: [])
_
OptionSetType
の新しいNSCalendarUnit
構造により、_.Month
_をより簡単に指定できます。OptionSetType
をとるパラメーター(NSCalendarOptions
をとる_options:
_パラメーターなど)はnil
にできないため、空のセット(_[]
_)「オプションなし」を表します。In Swift 2.0
let startDate = NSDate()
let dateComponent = NSDateComponents()
dateComponent.month = 1
let cal = NSCalendar.currentCalendar()
let endDate = cal.dateByAddingComponents(dateComponent, toDate: startDate, options: NSCalendarOptions(rawValue: 0))
FOR Swift 3.0
ここに関数があり、あなたはここのような任意のカウントで日、月、日を減らすことができます、私は現在のシステム日付の年を100年減らしました、あなたはそれを日、月にも行うことができますarrayで、その配列でやりたいことを何でもする
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)
}
希望する動作が月を追加し、夏時間を考慮している場合、他の回答は問題なく機能します。これにより、次のような結果が生成されます。
01/03/2017 00:00 + 1 month -> 31/03/2017 23:00
01/10/2017 00:00 + 1 month -> 01/11/2017 01:00
ただし、次のように、DSTによって失われたまたは得られた時間を無視したかったのです。
01/03/2017 00:00 + 1 month -> 01/04/2017 00:00
01/10/2017 00:00 + 1 month -> 01/11/2017 00:00
したがって、DST境界が渡されるかどうかを確認し、渡される場合は、それに応じて1時間加算または減算します。
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
}
テスト:
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)
}
完全を期すために、私が使用している.asDate()メソッド
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()!
}
}
ユーザーが自動的に現在までの計算を選択することに基づいて、「月」または正確に30日または1日または1年を追加しますか。
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]
init];
[dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
NSDateComponents *components = [calendar components:(NSCalendarUnitHour | NSCalendarUnitMinute) fromDate:[NSDate date]];
NSDateComponents *dayComponent = [[NSDateComponents alloc]
init];
int changeid = [here number of days intValue];
dayComponent.hour = changeid;
NSCalendar *theCalendar = [NSCalendar currentCalendar];
NSDate *nextDate = [theCalendar
dateByAddingComponents:dayComponent toDate:[dateFormatter
dateFromString:self.fromDateTF.text] options:0];
NSLog(@"nextDate: %@ ...", nextDate);
[self.toDateTF setText:[dateFormatter
stringFromDate:nextDate]];
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