Comment calculer la différence en jours pour deux Date dans Swift que les jours commencent à 6 heures au lieu de 0

Question

J'essaie d'obtenir la différence dans deux objets Date. Je sais comment le faire au fond, qui est comme ceci:

 let date = Date() 
     let dateFormatter = DateFormatter() 
     dateFormatter.locale = Locale.current 

     print(count) 
     // print(history[count - 1].value(forKey: "multipleURLs") as! [String]) 
     let latestDate = history[count - 1].value(forKey: "date") as! Date 
     let calendar = Calendar.current 

     let components = calendar.dateComponents([.year, .month, .day, .hour], from: date) 

     let nowDate = calendar.startOfDay(for: date) 
     let lastDate = calendar.startOfDay(for: latestDate) 

     let diffDateComponent = (calendar as NSCalendar).components([NSCalendar.Unit.year, NSCalendar.Unit.month, NSCalendar.Unit.day], from: lastDate, to: nowDate, options: NSCalendar.Options.init(rawValue: 0)) 

     print("Status Checked" + String(describing: diffDateComponent.day)) 

Mais je suis en train d'obtenir le résultat en début de journée de 6 heures du matin au lieu de 0.

Je a fait quelque chose comme ceci:

 let nowDate = calendar.startOfDay(for: date.addingTimeInterval(-3600)) 
     let lastDate = calendar.startOfDay(for: latestDate.addingTimeInterval(-3600)) 

Mais cela ne semble pas fonctionner, quelqu'un peut-il m'aider avec ceci?

Answer 1

gars Merci, j'ai enfin compris. Au cas où quelqu'un en aurait besoin, voici comment c'est fait:

 let date = Date() 
     let dateFormatter = DateFormatter() 
     dateFormatter.locale = Locale.current 

     let latestDate = history[count - 1].value(forKey: "date") as! Date 
     let calendar = Calendar.current 

     let nowDate = calendar.date(byAdding: .hour, value: -6, to: date) 
     let lastDate = calendar.date(byAdding: .hour, value: -6, to: latestDate) 

     let finalNowDate = calendar.startOfDay(for: nowDate!) 
     let finalLastDate = calendar.startOfDay(for: lastDate!) 

     let diffDateComponent = calendar.dateComponents([.day], from: finalLastDate, to: finalNowDate) 
     print("dif\(diffDateComponent.day)") 

Answer 2

Cela va régler chaque date à 6 heures (dans la configuration locale du Date):

import Foundation 

// set up dates 
let calendar = Calendar.current 
let date = Date() 
if let latestDate = calendar.date(byAdding: .day, value: -5, to: date) { 

    // set each day to 6 AM 
    if let nowDate = calendar.date(bySettingHour: 6, minute: 0, second: 0, of: date  ), 
    let lastDate = calendar.date(bySettingHour: 6, minute: 0, second: 0, of: latestDate) { 

    print( date.description(with: .current), 
      nowDate.description(with: .current), 
      lastDate.description(with: .current), 
      separator: "\n") 

    // calculate difference in days 
    if let days = calendar.dateComponents([.day], from: lastDate, to: nowDate).day { 
     print("Days since: \(days)") 
    } 
    } 
} 

// Thursday, June 8, 2017 at 7:59:42 AM Eastern Daylight Time 
// Thursday, June 8, 2017 at 6:00:00 AM Eastern Daylight Time 
// Saturday, June 3, 2017 at 6:00:00 AM Eastern Daylight Time 
// Days since: 5