Question

如何获取.extend中的当前日期？ unix-epoch打印当前时间。有什么办法可以获取今天凌晨12点的时间？

例如，当前时间是：2018年1月7日下午5:30。 timeIntervalSince1970将打印当前时间，即timeIntervalSince1970。纪元系统中的当前日期是2018年1月7日00:00 AM。即1546903800000

Answer 1

可以使用以下代码非常简单地完成此操作。无需日期组件或其他并发症。

var calendar = Calendar.current
// Use the following line if you want midnight UTC instead of local time
//calendar.timeZone = TimeZone(secondsFromGMT: 0)
let today = Date()
let midnight = calendar.startOfDay(for: today)
let tomorrow = calendar.date(byAdding: .day, value: 1, to: midnight)!

let midnightEpoch = midnight.timeIntervalSince1970
let tomorrowEpoch = tomorrow.timeIntervalSince1970

Answer 2

我会用组件来做。

假设您需要time(2)定义的时间（以秒为单位）。如果您需要time(3)定义的毫秒数，则可以将其乘以1000。

Public function WorkbookIsOpen(byval strFile as string) as Boolean

Dim wbkCurr as excel.workbook

WorkbookIsOpen = false
For each wbkCurr in application.Workbooks
    If wbkCurr.name = strfile then
        WorkbookIsOpen = true
        Exit for
    Endif
Next wbkCurr 

End function

您可以减去1来得到昨天。

如果您在世界标准时间（UTC，GMT，Z…您给世界标准时间起任何名称）中都需要此，请使用以下命令。

// Get right now as it's `DateComponents`.
let now = Calendar.current.dateComponents(in: .current, from: Date())

// Create the start of the day in `DateComponents` by leaving off the time.
let today = DateComponents(year: now.year, month: now.month, day: now.day)
let dateToday = Calendar.current.date(from: today)!
print(dateToday.timeIntervalSince1970)

// Add 1 to the day to get tomorrow.
// Don't worry about month and year wraps, the API handles that.
let tomorrow = DateComponents(year: now.year, month: now.month, day: now.day! + 1)
let dateTomorrow = Calendar.current.date(from: tomorrow)!
print(dateTomorrow.timeIntervalSince1970)

Answer 3

使用此扩展程序获取今天和明天的日期

extension Date {
   static var tomorrow:  Date { return Date().dayAfter }
   static var today: Date {return Date()}
   var dayAfter: Date {
      return Calendar.current.date(byAdding: .day, value: 1, to: Date())!
   }
}

Answer 4

还尝试在日期扩展中添加以下代码：

extension Date
{
    var startOfDay: Date 
    {
        return Calendar.current.startOfDay(for: self)
    }

    func getDate(dayDifference: Int) -> Date {
        var components = DateComponents()
        components.day = dayDifference
        return Calendar.current.date(byAdding: components, to:startOfDay)!
    }
}

Answer 5

您可以使用以下方法通过添加天数，月数或年数来获取任何日期通过指定日历组件和该组件的增量值：

func getSpecificDate(byAdding component: Calendar.Component, value: Int) -> Date {

    let noon = Calendar.current.date(bySettingHour: 12, minute: 0, second: 0, of: self)!

    return Calendar.current.date(byAdding: component, value: value, to: noon)!
}

其中组件可以是以下选项之一：（.day，.month，.year），该值就是您要为此组件添加的金额

例如，要获取下一年的日期，可以使用以下代码：

var nextYear = getSpecificDate(byAdding: .year, value: 1).timeIntervalSince1970

如何快速获取今天和明天的日期4

5 个答案: