获取两个NSDates之间的差异（月/天/小时/分钟/秒） [英] Getting the difference between two NSDates in (months/days/hours/minutes/seconds)

问题描述

我试图将当前日期与 NSDate（）之间的差异和来自PHP time（）的日期; 调用例如： NSDate（timeIntervalSinceReferenceDate：1417147270）。如何获得两个日期之间的时间差异。我想要一个比较两个日期的函数和 if（seconds> 60）然后它返回分钟， if（分钟> 60）返回小时和 if（小时> 24）返回天数等等。

I am trying to get the difference between the current date as NSDate() and a date from a PHP time(); call for example: NSDate(timeIntervalSinceReferenceDate: 1417147270). How do I go about getting the difference in time between the two dates. I'd like to have a function that compares the two dates and if(seconds > 60) then it returns minutes, if(minutes > 60) return hours and if(hours > 24) return days and so on.

我该如何解决这个问题？

How should I go about this?

编辑：当前接受的答案完全符合我的要求想做。我推荐它用于在PHP time（）函数使用的形式中获取两个日期之间的时间。如果你不是特别熟悉PHP，那就是1970年1月1日以秒为单位的时间。这对PHP的后端很有用。如果您使用像NodeJS这样的后端，您可能需要考虑下面的其他一些选项。

The current accepted answer has done exactly what I've wanted to do. I recommend it for easy usage for getting the time between two dates in the form that that PHP time() function uses. If you aren't particularly familiar with PHP, that's the time in seconds from January 1st, 1970. This is beneficial for a backend in PHP. If perhaps you're using a backend like NodeJS you might want to consider some of the other options you'll find below.

推荐答案

Xcode 9.3•Swift 4.1

您可以使用日历帮助您创建扩展以进行日期计算，如下所示：

You can use Calendar to help you create an extension to do your date calculations as follow:

extension Date {
    /// Returns the amount of years from another date
    func years(from date: Date) -> Int {
        return Calendar.current.dateComponents([.year], from: date, to: self).year ?? 0
    }
    /// Returns the amount of months from another date
    func months(from date: Date) -> Int {
        return Calendar.current.dateComponents([.month], from: date, to: self).month ?? 0
    }
    /// Returns the amount of weeks from another date
    func weeks(from date: Date) -> Int {
        return Calendar.current.dateComponents([.weekOfMonth], from: date, to: self).weekOfMonth ?? 0
    }
    /// Returns the amount of days from another date
    func days(from date: Date) -> Int {
        return Calendar.current.dateComponents([.day], from: date, to: self).day ?? 0
    }
    /// Returns the amount of hours from another date
    func hours(from date: Date) -> Int {
        return Calendar.current.dateComponents([.hour], from: date, to: self).hour ?? 0
    }
    /// Returns the amount of minutes from another date
    func minutes(from date: Date) -> Int {
        return Calendar.current.dateComponents([.minute], from: date, to: self).minute ?? 0
    }
    /// Returns the amount of seconds from another date
    func seconds(from date: Date) -> Int {
        return Calendar.current.dateComponents([.second], from: date, to: self).second ?? 0
    }
    /// Returns the amount of nanoseconds from another date
    func nanoseconds(from date: Date) -> Int {
        return Calendar.current.dateComponents([.nanosecond], from: date, to: self).nanosecond ?? 0
    }
    /// Returns the a custom time interval description from another date
    func offset(from date: Date) -> String {
        if years(from: date)   > 0 { return "\(years(from: date))y"   }
        if months(from: date)  > 0 { return "\(months(from: date))M"  }
        if weeks(from: date)   > 0 { return "\(weeks(from: date))w"   }
        if days(from: date)    > 0 { return "\(days(from: date))d"    }
        if hours(from: date)   > 0 { return "\(hours(from: date))h"   }
        if minutes(from: date) > 0 { return "\(minutes(from: date))m" }
        if seconds(from: date) > 0 { return "\(seconds(from: date))s" }
        if nanoseconds(from: date) > 0 { return "\(nanoseconds(from: date))ns" }
        return ""
    }
}

---

使用日期组件格式化程序

---

Using Date Components Formatter

let dateComponentsFormatter = DateComponentsFormatter()
dateComponentsFormatter.allowedUnits = [.year,.month,.weekOfMonth,.day,.hour,.minute,.second]  
// Cannot add in .nanosecond here (⬆︎) as Swift 4.1 does not consider nanoseconds a calendrical unit

dateComponentsFormatter.maximumUnitCount = 1
dateComponentsFormatter.unitsStyle = .full
dateComponentsFormatter.string(from: Date(), to: Date(timeIntervalSinceNow: 4000000))  // "1 month"

---

---

let date1 = DateComponents(calendar: .current, year: 2014, month: 11, day: 28, hour: 5, minute: 9).date!
let date2 = DateComponents(calendar: .current, year: 2015, month: 8, day: 28, hour: 5, minute: 9).date!

let years = date2.years(from: date1)             // 0
let months = date2.months(from: date1)           // 9
let weeks = date2.weeks(from: date1)             // 39
let days = date2.days(from: date1)               // 273
let hours = date2.hours(from: date1)             // 6,553
let minutes = date2.minutes(from: date1)         // 393,180
let seconds = date2.seconds(from: date1)         // 23,590,800
let nanoseconds = date2.nanoseconds(from: date1) // 23,590,800,000,000,000

let timeOffset = date2.offset(from: date1) // "9M"

let date3 = DateComponents(calendar: .current, year: 2014, month: 11, day: 28, hour: 5, minute: 9).date!
let date4 = DateComponents(calendar: .current, year: 2015, month: 11, day: 28, hour: 5, minute: 9).date!

let timeOffset2 = date4.offset(from: date3) // "1y"

let date5 = DateComponents(calendar: .current, year: 2017, month: 4, day: 28).date!
let now = Date()
let timeOffset3 = now.offset(from: date5) // "1w"

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