计算2个日期内的持续时间

如何解决计算2个日期内的持续时间

如何计算两个日期集之间的时间（持续时间）？（小时和分钟-所有时间均为UTC）

// 2 date sets (2 daylight periods)
let dateFormatter = DateFormatter()

let dayStart1 = dateFormatter.date(from: "2020-10-06 07:02:42")!
let dayEnd1 = dateFormatter.date(from: "2020-10-06 19:20:46")!

let dayStart2 = dateFormatter.date(from: "2020-10-07 06:59:40")!
let dayEnd2 = dateFormatter.date(from: "2020-10-07 18:58:12")!

// MARK：示例1

从上述日期范围内的开始和结束日期开始计算持续时间。

let start1 = dateFormatter.date(from: "2020-10-06 17:10:00")!
let end1 = dateFormatter.date(from: "2020-10-07 03:50:00")!

应返回：02:10（2小时10分钟）

// MARK：示例2

let start2 = dateFormatter.date(from: "2020-10-06 17:10:00")!
let end2 = dateFormatter.date(from: "2020-10-07 07:59:45")!

应返回：03:10（3小时10分钟）

解决方法

您要查找的东西称为DateInterval。您可以简单地从日期创建日期间隔并获取其交集。然后，您可以对结果的持续时间求和：

let fmt = DateFormatter()
fmt.locale = .init(identifier: "en_US_POSIX")
fmt.dateFormat = "yyyy-MM-dd HH:mm:ss"
fmt.timeZone = TimeZone(secondsFromGMT: 0)!
let dayStart1 = fmt.date(from: "2020-10-06 07:02:42")!
let dayEnd1 = fmt.date(from: "2020-10-06 19:20:46")!
let dayStart2 = fmt.date(from: "2020-10-07 06:59:40")!
let dayEnd2 = fmt.date(from: "2020-10-07 18:58:12")!
let di1 = DateInterval(start: dayStart1,end: dayEnd1)
let di2 = DateInterval(start: dayStart2,end: dayEnd2)

let start1 = fmt.date(from: "2020-10-06 17:10:00")!
let end1 = fmt.date(from: "2020-10-07 03:50:00")!
let workout = DateInterval(start: start1,end: end1)
let intersection1 = di1.intersection(with: workout)
let intersection2 = di2.intersection(with: workout)
let duration = (intersection1?.duration ?? .zero) + (intersection2?.duration ?? .zero)
let dcf = DateComponentsFormatter()
dcf.string(from: duration)  // "2:10:46"

let start2 = fmt.date(from: "2020-10-06 17:10:00")!
let end2 = fmt.date(from: "2020-10-07 07:59:45")!
let workout2 = DateInterval(start: start2,end: end2)
let intersection3 = di1.intersection(with: workout2)
let intersection4 = di2.intersection(with: workout2)
let duration2 = (intersection3?.duration ?? .zero) + (intersection4?.duration ?? .zero)
dcf.string(from: duration2)  // "3:10:51"

您在example1和example2中的结果是错误的将这些扩展添加到您的项目中

extension TimeInterval{

    func stringFromTimeInterval() -> String {

        let time = NSInteger(self)

        let seconds = time % 60
        let minutes = (time / 60) % 60
        let hours = (time / 3600)

        return String(format: "%0.2d:%0.2d:%0.2d",hours,minutes,seconds)

    }}

extension Date {
 static func getTimeInterval(to: Date,from: Date) -> TimeInterval {
        return to.timeIntervalSinceReferenceDate - from.timeIntervalSinceReferenceDate
    }

}


  

  let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        let start1 = dateFormatter.date(from: "2020-10-06 17:10:00")!
        let end1 = dateFormatter.date(from: "2020-10-07 07:59:45")!
        print(Date.getTimeInterval(to: end1,from: start1).stringFromTimeInterval())