¿Cómo agregar un mes al objeto NSDate?
NSDate *someDate = [NSDate Date] + 30Days.....;
Respuestas:
Necesita utilizar NSDateComponents :
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
[date timeIntervalSinceDate:otherDate]
que devolverá la diferencia entre ellas en segundos (menos de 0 para fechas pasadas, mayor que 0 para fechas futuras).
Con iOS 8 y OS X 10.9 puede agregar NSCalendarUnits
usando NSCalendar
:
C objetivo
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *someDate = [cal dateByAddingUnit:NSCalendarUnitMonth value:1 toDate:[NSDate date] options:0];
Swift 3
let date = Calendar.current.date(byAdding: .month, value: 1, to: Date())
Swift 2
let cal = NSCalendar.currentCalendar()
let date = cal.dateByAddingUnit(.Month, value: 1, toDate: NSDate(), options: [])
Para 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)!
}
}
Por ejemplo, para agregar 3
meses a la fecha actual en Swift:
let date = NSCalendar.currentCalendar().dateByAddingUnit(.MonthCalendarUnit, value: 3, toDate: NSDate(), options: nil)!
let date = NSCalendar.currentCalendar().dateByAddingUnit(.Month, value: 3, toDate: NSDate(), options: [])
OptionSetType
estructura de le NSCalendarUnit
permite especificar más simplemente.Month
OptionSetType
(como el options:
parámetro, que toma NSCalendarOptions
) no pueden ser nil
, así que pase un conjunto vacío ( []
) para representar "sin opciones"..MonthCalendarUnit
está en desuso, use.CalendarUnitMonth
En 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))
PARA SWIFT 3.0
aquí está la función, puede reducir días, mes, día en cualquier recuento como, por ejemplo, aquí, he reducido el año de la fecha actual del sistema en 100 años, puede hacerlo por día, mes también simplemente configure el contador y luego almacene los valores en matriz, y haga lo que quiera hacer con esa matriz
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)
}
Otras respuestas funcionan bien si su comportamiento deseado es agregar un mes y permitir el horario de verano. Esto produce resultados tales que:
01/03/2017 00:00 + 1 month -> 31/03/2017 23:00
01/10/2017 00:00 + 1 month -> 01/11/2017 01:00
Sin embargo, quería ignorar la hora perdida o ganada por DST, de modo que:
01/03/2017 00:00 + 1 month -> 01/04/2017 00:00
01/10/2017 00:00 + 1 month -> 01/11/2017 00:00
Entonces verifico si se pasa un límite de DST, y si es así, sumo o resto una hora en consecuencia:
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
}
Prueba:
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)
}
Para completar, el método .asDate () que estoy usando
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()!
}
}
¿Desea agregar un "mes" o exactamente 30 días o un día o un año según el usuario que seleccione automáticamente el cálculo hasta la fecha?
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]];
////mes
¿Quiere agregar un "mes" o exactamente 30 días? Si son 30 días, hazlo así:
// get a date
NSDate *date = [NSDate dateWithNaturalLanguageString:@"2011-01-02"];
// add 30 days to it (in seconds)
date = [date dateByAddingTimeInterval:(30 * 24 * 60 * 60)];
NSLog(@"%@", date); // 2011-02-01
Nota: esto no tendrá en cuenta las transiciones del horario de verano ni los segundos intercalares. Use la respuesta de @ TheEye si lo necesita