如何在两个日期之间查找日期的特定日期

Question

我有两个日期 StartDate 和 EndDate。和 weekDays，我想找到特定的日子，例如这两个日期之间的星期一、星期二、星期六。以及如何在第二个循环中更改特定日期。

我想在下面的代码中在数组流中添加多个对象

NSDictionary *dict = @{
                   @"name": @"kiran",
                   @"startdate": @"25-11-16",
                   @"SUNDAY": @"none"
                   @"MONDAY": @"monday"
                   @"TUESDAY": @"tuesday"
                   @"WEDNESDAY": @"none"
                   @"THURSDAY": @"none"
                   @"FRIDAY": @"friday"
                   @"SATURDAY": @"none" 
                   @"EndDate": @"7-12-2016"
                   };

NSDictionary *dict1 = @{
                   @"name": @"Bala",
                   @"startdate": @"1-11-16",
                   @"SUNDAY": @"sunday"
                   @"MONDAY": @"none"
                   @"TUESDAY": @"tuesday"
                   @"WEDNESDAY": @"none"
                   @"THURSDAY": @"thursday"
                   @"FRIDAY": @"friday"
                   @"SATURDAY": @"none" 
                   @"EndDate": @"7-12-2016"
                   };

NSDictionary *dict2 = @{
                   @"name": @"Sri",
                   @"startdate": @"1-12-16",
                   @"SUNDAY": @"sunday"
                   @"MONDAY": @"monday"
                   @"TUESDAY": @"tuesday"
                   @"WEDNESDAY": @"wednesday"
                   @"THURSDAY": @"thursday"
                   @"FRIDAY": @"friday"
                   @"SATURDAY": @"saturday" 
                   @"EndDate": @"7-12-2016"
                   };

NSMutableArray *listMutableArray =[[NSMutableArray alloc] initWithObjects:dict,dict1,dict2, nil];

如何在两个日期之间执行循环？

我想要的输出是：第一个字典

25-11-2016，星期五，基兰

28-11-2016，星期一，基兰

29-11-2016，星期二，基兰

2-12-2016，星期五，基兰

2016 年 5 月 12 日，星期一，基兰

2016 年 6 月 12 日，星期二，基兰

与第二个和第三个 dict 输出相同。并且所有工作日都存储在一个数组中。

Answer 1

extension Date {

    static func generateDatesArrayBetweenTwoDates(startDate: Date, endDate: Date) -> [Date] {
        var datesArray: [Date] = [Date]()
        var startDate = startDate
        let calendar = Calendar.current
        while startDate <= endDate {
            let tempDate = self.dateFormatter().string(from: startDate)
            datesArray.append(self.dateFormatter().date(from: tempDate) ?? Date())
            startDate = calendar.date(byAdding: .day, value: 1, to: startDate)! 
        }
        return datesArray
    }

    static func dateFormatter() -> DateFormatter {
        let formatter = DateFormatter()
        formatter.dateFormat = "MM/dd/yyyy"
        return formatter
    }

}

获取特定天数

func getDates() {
        var count = 0
        let tempStartDate = Date.dateFormatter().string(from: Date())
        guard let startDate = Date.dateFormatter().date(from: tempStartDate) else {
            return
        }
        let tempEndDate = Date.dateFormatter().string(from: Date(timeIntervalSince1970: 1575181456)) // lets say 1st dec 2019
        guard let endDate = Date.dateFormatter().date(from: tempEndDate) else {
            return
        }
        let datesArray = Date.generateDatesArrayBetweenTwoDates(startDate: endDate, endDate: startDate)
        for date in datesArray {
            let calendar = Calendar(identifier: .gregorian)
            let components = calendar.dateComponents([.weekday], from: date)
            if components.weekday == 6 { // For friday check
                count += 1
                print("Hello Friday")
            } else {
                print("It's not Friday")
            }
        }
        print("number of fridays", count)
    }

希望对你有帮助

Answer 2

我更习惯于 swift，所以我将使用 swift 而不是 objC 来给出我的答案，如果你的代码必须使用 objC，则将其作为伪代码阅读

要获得您想要的结果，只需说 MutableArray 的第一项

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy"

let dict = listMutableArray[0] as Dictionary
let name = dict["name"]
let startDate = dateFormatter.date(from: dict["startdate"])
let endDate = dateFormatter.date(from: dict["enddate"])

let totalDuration = endDate.timeIntervalSince(startDate)
let totalDuration = totalDuration/86400 //to get days from seconds - 86400 = 60*60*24

let weekDaysToCount:Array<Bool> = Array()
if dict["MONDAY"] != "none" {
    weekDaysToCount.append(true)
} else {
    weekDaysToCount.append(false)
}
... ...
//Repeat for all days

for i in 0..<Int(totalDuration) {
    for validDay in weekDaysToCount {
        startDate = startDate.addingTimeInterval(86400) //one day
        if validDay {
            print("\(startDate), \(name)")
        }
    }
}

请注意，weekDaysToCount 假设起始日为星期一，此时情况并非如此，因此您需要调整数组。