ricevi NSDate oggi, ieri, questa settimana, l’ultima settimana, questo mese, lo scorso mese … le variabili

Adattato dalla Guida alla programmazione di data e ora :

 // Right now, you can remove the seconds into the day if you want NSDate *today = [NSDate date]; // All intervals taken from Google NSDate *yesterday = [today dateByAddingTimeInterval: -86400.0]; NSDate *thisWeek = [today dateByAddingTimeInterval: -604800.0]; NSDate *lastWeek = [today dateByAddingTimeInterval: -1209600.0]; // To get the correct number of seconds in each month use NSCalendar NSDate *thisMonth = [today dateByAddingTimeInterval: -2629743.83]; NSDate *lastMonth = [today dateByAddingTimeInterval: -5259487.66]; 

Se si desidera il numero esatto corretto di giorni a seconda del mese, è necessario utilizzare un NSCalendar .

Potrebbe essere un modo migliore per scrivere questo, ma qui quello che ho trovato sul suggerimento NSCalendar di Ben e lavorare da lì a NSDateComponents

 NSCalendar *cal = [NSCalendar currentCalendar]; NSDateComponents *components = [cal components:( NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond ) fromDate:[[NSDate alloc] init]]; [components setHour:-[components hour]]; [components setMinute:-[components minute]]; [components setSecond:-[components second]]; NSDate *today = [cal dateByAddingComponents:components toDate:[[NSDate alloc] init] options:0]; //This variable should now be pointing at a date object that is the start of today (midnight); [components setHour:-24]; [components setMinute:0]; [components setSecond:0]; NSDate *yesterday = [cal dateByAddingComponents:components toDate: today options:0]; components = [cal components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:[[NSDate alloc] init]]; [components setDay:([components day] - ([components weekday] - 1))]; NSDate *thisWeek = [cal dateFromComponents:components]; [components setDay:([components day] - 7)]; NSDate *lastWeek = [cal dateFromComponents:components]; [components setDay:([components day] - ([components day] -1))]; NSDate *thisMonth = [cal dateFromComponents:components]; [components setMonth:([components month] - 1)]; NSDate *lastMonth = [cal dateFromComponents:components]; NSLog(@"today=%@",today); NSLog(@"yesterday=%@",yesterday); NSLog(@"thisWeek=%@",thisWeek); NSLog(@"lastWeek=%@",lastWeek); NSLog(@"thisMonth=%@",thisMonth); NSLog(@"lastMonth=%@",lastMonth); 

NSDateComponents è bello da ottenere oggi:

 NSCalendar *cal = [NSCalendar currentCalendar]; NSDate *date = [NSDate date]; NSDateComponents *comps = [cal components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:date]; NSDate *today = [cal dateFromComponents:comps]; 

Ciò crea un NSDate con solo anno, mese e data:

 (gdb) po today 2010-06-22 00:00:00 +0200 

Per ottenere ieri, ecc. Puoi calcolarlo usando NSDateComponents:

 NSDateComponents *components = [[NSDateComponents alloc] init]; [components setDay:-1]; NSDate *yesterday = [cal dateByAddingComponents:components toDate:today options:0]; 

 + (NSDate*)dateFor:(enum DateType)dateType { NSCalendar *calendar = [NSCalendar currentCalendar]; NSDateComponents *comps = [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:[NSDate date]]; if(dateType == DateYesterday) { comps.day--; } else if(dateType == DateThisWeek) { comps.weekday = 1; } else if(dateType == DateLastWeek) { comps.weekday = 1; comps.week--; } else if(dateType == DateThisMonth) { comps.day = 1; } else if(dateType == DateLastMonth) { comps.day = 1; comps.month--; } else if(dateType != DateToday) return nil; return [calendar dateFromComponents:comps]; } 

Swift 2

 let today = NSDate() let yesterday = today.dateByAddingTimeInterval(-86400.0) let thisWeek = today.dateByAddingTimeInterval(-604800.0) let lastWeek = today.dateByAddingTimeInterval(-1209600.0) let thisMonth = today.dateByAddingTimeInterval(-2629743.83) let lastMonth = today.dateByAddingTimeInterval(-5259487.66) // components of the date let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian) let components = calendar.components([.Year, .Month, .Day], fromDate: today) let (year, month, day) = (components.year, components.month, components.day) 

Swift 3

 let today = Date() let yesterday = today.addingTimeInterval(-86400.0) let thisWeek = today.addingTimeInterval(-604800.0) let lastWeek = today.addingTimeInterval(-1209600.0) let thisMonth = today.addingTimeInterval(-2629743.83) let lastMonth = today.addingTimeInterval(-5259487.66) // components of the date var calendar = Calendar(identifier: Calendar.Identifier.gregorian) let components = calendar.dateComponents([.year, .month, .day], from: today) let (year, month, day) = (components.year, components.month, components.day) 

In Swift 3 , si noti che i componenti della data sono opzionali.

Le altre risposte non hanno funzionato per me (forse a causa del mio fuso orario). Ecco come lo faccio:

 - (BOOL)isOnThisWeek:(NSDate *)dateToCompare { NSCalendar * calendar = [NSCalendar currentCalendar]; NSDate * today = [NSDate date]; int todaysWeek = [[calendar components: NSWeekCalendarUnit fromDate:today] week]; int dateToCompareWeek = [[calendar components: NSWeekCalendarUnit fromDate:dateToCompare] week]; int todaysYear = [[calendar components:NSYearCalendarUnit fromDate:today] year]; int dateToCompareYear = [[calendar components:NSYearCalendarUnit fromDate:dateToCompare] year]; if (todaysWeek == dateToCompareWeek && todaysYear == dateToCompareYear) { return YES; } return NO; } 

Se utilizzi iOS 10+ o MacOS 10.12+, puoi utilizzare questi due metodi di Calendar per farlo correttamente.

• func date(byAdding component: Calendar.Component, value: Int, to date: Date, wrappingComponents: Bool = default) -> Date? ( documenti )
• func dateInterval(of component: Calendar.Component, for date: Date) -> DateInterval? ( documenti )

Ecco un esempio di come utilizzare questi metodi in Swift 3, insieme all’output dei campi da gioco nel mio fuso orario.

 let calendar = Calendar.current let now = Date() // => "Apr 28, 2017, 3:33 PM" let yesterday = calendar.date(byAdding: .day, value: -1, to: now) // => "Apr 29, 2017, 3:33 PM" let yesterdayStartOfDay = calendar.startOfDay(for: yesterday!) // => ""Apr 29, 2017, 12:00 AM" let thisWeekInterval = calendar.dateInterval(of: .weekOfYear, for: now) // => 2017-04-23 04:00:00 +0000 to 2017-04-30 04:00:00 +0000 let thisMonthInterval = calendar.dateInterval(of: .month, for: now) // => 2017-04-01 04:00:00 +0000 to 2017-05-01 04:00:00 +0000 let aDateInLastWeek = calendar.date(byAdding: .weekOfYear, value: -1, to: now) let lastWeekInterval = calendar.dateInterval(of: .weekOfYear, for: aDateInLastWeek!) // => 2017-04-16 04:00:00 +0000 to 2017-04-23 04:00:00 +0000 let aDateInLastMonth = calendar.date(byAdding: .month, value: -1, to: now) let lastMonthInterval = calendar.dateInterval(of: .weekOfYear, for: aDateInLastMonth!) // => 2017-03-26 04:00:00 +0000 to 2017-04-02 04:00:00 +0000 

Bonus: puoi usare DateInterval s per verificare se una data rientra in quell’intervallo. Continuando dall’alto:

 thisWeekInterval!.contains(now) // => true lastMonthInterval!.contains(now) // => false 

 NSDate *today = [NSDate date]; // Today's date NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDateComponents *weekdayComponents =[gregorian componentsNSDayCalendarUnit | NSWeekdayCalendarUnit) fromDate:today]; NSInteger day = [weekdayComponents day]; 

Mi piace molto l’object THCalendarInfo contenuto in questo progetto:

http://github.com/jaredholdcroft/kcalendar

Non riesco a trovare l’originale. Usando questo object puoi spostarti al giorno precedente, all’inizio di una settimana, all’inizio di un mese, ottenere il giorno della settimana, il giorno del mese … ecc. Ecc.

 NSDate *today = [[NSDate alloc] initWithTimeIntervalSinceNow:0]; 

Questo è per controllare la data è questo mese o no

 func isOnThisMonth(dateToCompare: NSDate) -> Bool { let calendar: NSCalendar = NSCalendar.currentCalendar() let today: NSDate = NSDate() let todaysWeek: Int = calendar.components(NSCalendarUnit.Month, fromDate: today).month let dateToCompareWeek: Int = calendar.components(.Month, fromDate: dateToCompare).month let todaysYear: Int = calendar.components(NSCalendarUnit.Year, fromDate: today).year let dateToCompareYear: Int = calendar.components(NSCalendarUnit.Year, fromDate: dateToCompare).year if todaysWeek == dateToCompareWeek && todaysYear == dateToCompareYear { return true } return false } 

E il secondo cambia solo tipo di calendarUnit per debole come questo

 func isOnThisWeek(dateToCompare: NSDate) -> Bool { let calendar: NSCalendar = NSCalendar.currentCalendar() let today: NSDate = NSDate() let todaysWeek: Int = calendar.components(NSCalendarUnit.Weekday, fromDate: today).weekday let dateToCompareWeek: Int = calendar.components(.Weekday, fromDate: dateToCompare).weekday let todaysYear: Int = calendar.components(NSCalendarUnit.Year, fromDate: today).year let dateToCompareYear: Int = calendar.components(NSCalendarUnit.Year, fromDate: dateToCompare).year if todaysWeek == dateToCompareWeek && todaysYear == dateToCompareYear { return true } return false } 

Spero che questo sia utile a qualcuno Grazie.

Ho già risposto a una domanda simile ed ecco perché la mia risposta è migliore:

• Swift 3 !
• Utilizza DateFormatter “Ieri” e “Oggi”. Questo è già stato tradotto da Apple, che ti fa risparmiare lavoro!
• Utilizza la stringa “1 settimana” già tradotta da DateComponentsFormatter. (Ancora meno lavoro per te, per gentile concessione di Apple.) Tutto quello che devi fare è tradurre la stringa “% @ ago”. 🙂
• Le altre risposte calcolano erroneamente l’ora in cui il giorno passa da “oggi” a “ieri” a ecc. Le costanti fisse sono un grande NO-NO perché le ragioni . Inoltre, le altre risposte usano la data / ora corrente quando dovrebbero usare la fine della data / ora del giorno corrente .
• Utilizza autoupdatingCurrent per Calendar e Locale che assicura che la tua app sia immediatamente aggiornata con le preferenze di calendario e lingua dell’utente in Settings.app