Estou me perguntando se há alguma possibilidade nova e incrível de obter a quantidade de dias entre dois NSDates em Swift / o "novo" Cocoa?
Por exemplo, como em Ruby, eu faria:
(end_date - start_date).to_i
Estou me perguntando se há alguma possibilidade nova e incrível de obter a quantidade de dias entre dois NSDates em Swift / o "novo" Cocoa?
Por exemplo, como em Ruby, eu faria:
(end_date - start_date).to_i
Respostas:
Você também deve considerar a diferença de fuso horário. Por exemplo, se você comparar as datas 2015-01-01 10:00
e 2015-01-02 09:00
, os dias entre essas datas retornarão como 0 (zero), pois a diferença entre essas datas é menor que 24 horas (é 23 horas).
Se o seu objetivo é obter o número exato do dia entre duas datas, você pode contornar esse problema desta forma:
// Assuming that firstDate and secondDate are defined
// ...
let calendar = NSCalendar.currentCalendar()
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDayForDate(firstDate)
let date2 = calendar.startOfDayForDate(secondDate)
let flags = NSCalendarUnit.Day
let components = calendar.components(flags, fromDate: date1, toDate: date2, options: [])
components.day // This will return the number of day(s) between dates
let calendar = Calendar.current
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDay(for: firstDate)
let date2 = calendar.startOfDay(for: secondDate)
let components = calendar.dateComponents([.day], from: date1, to: date2)
calendar.date(bySettingHour: 12, minute: 00, second: 00, of: calendar.startOfDay(for: firstDate))
startOfDay()
parece ser desnecessário): calendar.date(bySettingHour: 12, minute: 0, second: 0, of: firstDate)
.
Aqui está minha resposta para o Swift 2:
func daysBetweenDates(startDate: NSDate, endDate: NSDate) -> Int
{
let calendar = NSCalendar.currentCalendar()
let components = calendar.components([.Day], fromDate: startDate, toDate: endDate, options: [])
return components.day
}
today
etomorrow
Vejo algumas respostas do Swift3, então vou adicionar as minhas:
public static func daysBetween(start: Date, end: Date) -> Int {
Calendar.current.dateComponents([.day], from: start, to: end).day!
}
A nomenclatura parece mais rápida, é uma linha e usa o dateComponents()
método mais recente .
Traduzi minha resposta Objective-C
let start = "2010-09-01"
let end = "2010-09-05"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let startDate:NSDate = dateFormatter.dateFromString(start)
let endDate:NSDate = dateFormatter.dateFromString(end)
let cal = NSCalendar.currentCalendar()
let unit:NSCalendarUnit = .Day
let components = cal.components(unit, fromDate: startDate, toDate: endDate, options: nil)
println(components)
resultado
<NSDateComponents: 0x10280a8a0>
Day: 4
A parte mais difícil é que o autocompletar insiste em fromDate e toDate seria NSDate?
, mas na verdade eles devem ser NSDate!
conforme mostrado na referência.
Não vejo como seria uma boa solução com um operador, já que você deseja especificar a unidade de forma diferente em cada caso. Você poderia retornar o intervalo de tempo, mas não ganhará muito.
.DayCalendarUnit
está obsoleto. Eu acredito que agora você deve usar em seu .CalendarUnitDay
lugar.
let components = cal.components(.Day, fromDate: startDate, toDate: endDate, options: [])
.Day
agora mesmo
Aqui é muito bom, Date
extensão para obter diferença entre datas em anos, meses, dias, horas, minutos, segundos
extension Date {
func years(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.year], from: sinceDate, to: self).year
}
func months(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.month], from: sinceDate, to: self).month
}
func days(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.day], from: sinceDate, to: self).day
}
func hours(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.hour], from: sinceDate, to: self).hour
}
func minutes(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.minute], from: sinceDate, to: self).minute
}
func seconds(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.second], from: sinceDate, to: self).second
}
}
date
deve estar sinceDate
em parâmetros de função.
days
e funciona bem.
func years(since date: Date) -> Int? { return Calendar.current.dateComponents[.year], from: date, to: self).years }
, e você poderia chamá-lo de let y = date1.years(since: date2)
. Isso pode ser mais consistente com as convenções de nomenclatura modernas.
Atualização para Swift 3 iOS 10 Beta 4
func daysBetweenDates(startDate: Date, endDate: Date) -> Int {
let calendar = Calendar.current
let components = calendar.dateComponents([Calendar.Component.day], from: startDate, to: endDate)
return components.day!
}
Aqui está a resposta para Swift 3 (testado para IOS 10 Beta)
func daysBetweenDates(startDate: Date, endDate: Date) -> Int
{
let calendar = Calendar.current
let components = calendar.components([.day], from: startDate, to: endDate, options: [])
return components.day!
}
Então você pode chamá-lo assim
let pickedDate: Date = sender.date
let NumOfDays: Int = daysBetweenDates(startDate: pickedDate, endDate: Date())
print("Num of Days: \(NumOfDays)")
Swift 3. Obrigado a Emin Buğra Saral acima pela startOfDay
sugestão.
extension Date {
func daysBetween(date: Date) -> Int {
return Date.daysBetween(start: self, end: date)
}
static func daysBetween(start: Date, end: Date) -> Int {
let calendar = Calendar.current
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDay(for: start)
let date2 = calendar.startOfDay(for: end)
let a = calendar.dateComponents([.day], from: date1, to: date2)
return a.value(for: .day)!
}
}
Uso:
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let start = dateFormatter.date(from: "2017-01-01")!
let end = dateFormatter.date(from: "2018-01-01")!
let diff = Date.daysBetween(start: start, end: end) // 365
As coisas embutidas no Swift ainda são muito básicas. Como deveriam estar nesta fase inicial. Mas você pode adicionar suas próprias coisas com o risco de sobrecarregar operadores e funções de domínio global. Eles serão locais para o seu módulo.
let now = NSDate()
let seventies = NSDate(timeIntervalSince1970: 0)
// Standard solution still works
let days = NSCalendar.currentCalendar().components(.CalendarUnitDay,
fromDate: seventies, toDate: now, options: nil).day
// Flashy swift... maybe...
func -(lhs:NSDate, rhs:NSDate) -> DateRange {
return DateRange(startDate: rhs, endDate: lhs)
}
class DateRange {
let startDate:NSDate
let endDate:NSDate
var calendar = NSCalendar.currentCalendar()
var days: Int {
return calendar.components(.CalendarUnitDay,
fromDate: startDate, toDate: endDate, options: nil).day
}
var months: Int {
return calendar.components(.CalendarUnitMonth,
fromDate: startDate, toDate: endDate, options: nil).month
}
init(startDate:NSDate, endDate:NSDate) {
self.startDate = startDate
self.endDate = endDate
}
}
// Now you can do this...
(now - seventies).months
(now - seventies).days
Aqui está minha resposta para o Swift 3:
func daysBetweenDates(startDate: NSDate, endDate: NSDate, inTimeZone timeZone: TimeZone? = nil) -> Int {
var calendar = Calendar.current
if let timeZone = timeZone {
calendar.timeZone = timeZone
}
let dateComponents = calendar.dateComponents([.day], from: startDate.startOfDay, to: endDate.startOfDay)
return dateComponents.day!
}
Quase não existe nenhuma biblioteca padrão específica do Swift ainda; apenas os tipos básicos de números, strings e coleções.
É perfeitamente possível definir essas abreviações usando extensões, mas no que diz respeito às APIs prontas para usar, não existe um "novo" Cocoa; O Swift apenas mapeia diretamente para as mesmas APIs Cocoa antigas e verbosas, conforme já existem.
Vou adicionar minha versão, embora este tópico tenha um ano. Meu código é parecido com este:
var name = txtName.stringValue // Get the users name
// Get the date components from the window controls
var dateComponents = NSDateComponents()
dateComponents.day = txtDOBDay.integerValue
dateComponents.month = txtDOBMonth.integerValue
dateComponents.year = txtDOBYear.integerValue
// Make a Gregorian calendar
let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)
// Get the two dates we need
var birthdate = calendar?.dateFromComponents(dateComponents)
let currentDate = NSDate()
var durationDateComponents = calendar?.components(NSCalendarUnit.CalendarUnitDay, fromDate: birthdate!, toDate: currentDate, options: nil)
let numberOfDaysAlive = durationDateComponents?.day
println("\(numberOfDaysAlive!)")
txtGreeting.stringValue = "Hello \(name), You have been alive for \(numberOfDaysAlive!) days."
Eu espero que isso ajude alguém.
Felicidades,
Método de Erin atualizado para Swift 3, mostra os dias a partir de hoje (desconsiderando a hora do dia)
func daysBetweenDates( endDate: Date) -> Int
let calendar: Calendar = Calendar.current
let date1 = calendar.startOfDay(for: Date())
let date2 = calendar.startOfDay(for: secondDate)
return calendar.dateComponents([.day], from: date1, to: date2).day!
}
Isso retorna uma diferença absoluta em dias entre alguns Date
e hoje:
extension Date {
func daysFromToday() -> Int {
return abs(Calendar.current.dateComponents([.day], from: self, to: Date()).day!)
}
}
e então usá-lo:
if someDate.daysFromToday() >= 7 {
// at least a week from today
}
Você pode usar a seguinte extensão:
public extension Date {
func daysTo(_ date: Date) -> Int? {
let calendar = Calendar.current
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDay(for: self)
let date2 = calendar.startOfDay(for: date)
let components = calendar.dateComponents([.day], from: date1, to: date2)
return components.day // This will return the number of day(s) between dates
}
}
Então, você pode chamá-lo assim:
startDate.daysTo(endDate)
Swift 3.2
extension DateComponentsFormatter {
func difference(from fromDate: Date, to toDate: Date) -> String? {
self.allowedUnits = [.year,.month,.weekOfMonth,.day]
self.maximumUnitCount = 1
self.unitsStyle = .full
return self.string(from: fromDate, to: toDate)
}
}
Todas as respostas são boas. Mas, para localizações, precisamos calcular um número de dias decimais entre duas datas. para que possamos fornecer o formato decimal sustentável.
// This method returns the fractional number of days between to dates
func getFractionalDaysBetweenDates(date1: Date, date2: Date) -> Double {
let components = Calendar.current.dateComponents([.day, .hour], from: date1, to: date2)
var decimalDays = Double(components.day!)
decimalDays += Double(components.hour!) / 24.0
return decimalDays
}
extension Date {
func daysFromToday() -> Int {
return Calendar.current.dateComponents([.day], from: self, to: Date()).day!
}
}
Então use como
func dayCount(dateString: String) -> String{
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM dd,yyyy hh:mm a"
let fetchedDate = dateFormatter.date(from: dateString)
let day = fetchedDate?.daysFromToday()
if day! > -1{
return "\(day!) days passed."
}else{
return "\(day! * -1) days left."
}
}
Esta é uma versão atualizada da resposta de Emin para o Swift 5 que incorpora a sugestão de usar meio-dia em vez de meia-noite como horário definitivo para comparar dias. Ele também lida com a falha potencial de várias funções de data retornando um opcional.
///
/// This is an approximation; it does not account for time differences. It will set the time to 1200 (noon) and provide the absolute number
/// of days between now and the given date. If the result is negative, it should be read as "days ago" instead of "days from today."
/// Returns nil if something goes wrong initializing or adjusting dates.
///
func daysFromToday() -> Int?
{
let calendar = NSCalendar.current
// Replace the hour (time) of both dates with noon. (Noon is less likely to be affected by DST changes, timezones, etc. than midnight.)
guard let date1 = calendar.date(bySettingHour: 12, minute: 00, second: 00, of: calendar.startOfDay(for: Date())),
let date2 = calendar.date(bySettingHour: 12, minute: 00, second: 00, of: calendar.startOfDay(for: self)) else
{
return nil
}
return calendar.dateComponents([.day], from: date1, to: date2).day
}
Swift 3 - dias de hoje até a data
func daysUntilDate(endDateComponents: DateComponents) -> Int
{
let cal = Calendar.current
var components = cal.dateComponents([.era, .year, .month, .day], from: NSDate() as Date)
let today = cal.date(from: components)
let otherDate = cal.date(from: endDateComponents)
components = cal.dateComponents([Calendar.Component.day], from: (today! as Date), to: otherDate!)
return components.day!
}
Chamar função como esta
// Days from today until date
var examnDate = DateComponents()
examnDate.year = 2016
examnDate.month = 12
examnDate.day = 15
let daysCount = daysUntilDate(endDateComponents: examnDate)
opção mais fácil seria criar uma extensão em Date
public extension Date {
public var currentCalendar: Calendar {
return Calendar.autoupdatingCurrent
}
public func daysBetween(_ date: Date) -> Int {
let components = currentCalendar.dateComponents([.day], from: self, to: date)
return components.day!
}
}
func completeOffset(from date:Date) -> String? {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .brief
return formatter.string(from: Calendar.current.dateComponents([.year,.month,.day,.hour,.minute,.second], from: date, to: self))
}
se precisar de ano, mês, dias e horas como string, use este
var tomorrow = Calendar.current.date (byAdding: .day, value: 1, to: Date ())!
deixe dc = tomorrow.completeOffset (de: Data ())
Swift 4
func getDateHeader(indexPath: Int) -> String {
let formatter2 = DateFormatter()
formatter2.dateFormat = "MM-dd-yyyy"
var dateDeadline : Date?
dateDeadline = formatter2.date(from: arrCompletedDate[indexPath] as! String)
let currentTime = dateDeadline?.unixTimestamp
let calendar = NSCalendar.current
let date = NSDate(timeIntervalSince1970: Double(currentTime!))
if calendar.isDateInYesterday(date as Date) { return "Yesterday" }
else if calendar.isDateInToday(date as Date) { return "Today" }
else if calendar.isDateInTomorrow(date as Date) { return "Tomorrow" }
else {
let startOfNow = calendar.startOfDay(for: NSDate() as Date)
let startOfTimeStamp = calendar.startOfDay(for: date as Date)
let components = calendar.dateComponents([.day], from: startOfNow, to: startOfTimeStamp)
let day = components.day!
if day < 1 { return "\(abs(day)) days ago" }
else { return "In \(day) days" }
}
}
Solução Swift 5.2.4:
import UIKit
let calendar = Calendar.current
let start = "2010-09-01"
let end = "2010-09-05"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let firstDate = dateFormatter.date(from: start)!
let secondDate = dateFormatter.date(from: end)!
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDay(for: firstDate)
let date2 = calendar.startOfDay(for: secondDate)
let components = calendar.dateComponents([Calendar.Component.day], from: date1, to: date2)
components.day // This will return the number of day(s) between dates
func simpleIndex(ofDate: Date) -> Int {
// index here just means today 0, yesterday -1, tomorrow 1 etc.
let c = Calendar.current
let todayRightNow = Date()
let d = c.date(bySetting: .hour, value: 13, of: ofDate)
let t = c.date(bySetting: .hour, value: 13, of: todayRightNow)
if d == nil || today == nil {
print("weird problem simpleIndex#ofDate")
return 0
}
let r = c.dateComponents([.day], from: today!, to: d!)
// yesterday is negative one, tomorrow is one
if let o = r.value(for: .day) {
return o
}
else {
print("another weird problem simpleIndex#ofDate")
return 0
}
}
let calendar = NSCalendar.currentCalendar();
let component1 = calendar.component(.Day, fromDate: fromDate)
let component2 = calendar.component(.Day, fromDate: toDate)
let difference = component1 - component2