如何将特定的格林尼治标准时间用于其他时区可以识别的功能 [英] How to use a specific GMT for a function which will be recognised by other time zones

问题描述

我想有一种简单的方法可以做到这一点，我只是还没有弄清楚.

I imagine there's a simple way to do this, I just haven't figured it out yet.

我只想在AEST(格林尼治标准时间+10)上午9点至下午12点之间显示一个按钮.

I want to display a button only between 9am to 12pm AEST (GMT+10).

因此对于AWST(GMT + 8)中的用户，当他们是上午11点时，他们将无法看到该按钮.

So for a user in AWST (GMT+8), they will not be able to see the button when it is 11am for them.

我有特定的时间要使用

let date = Date()
let dateFormatterTime = DateFormatter()
dateFormatterTime.dateFormat = "HH:mm:ss"
dateFormatterTime.timeZone = TimeZone(secondsFromGMT: 36000)
let sydneyTime = dateFormatterTime.string(from: date)
  
print(sydneyTime)

我有一个适用于每个位置的时区的功能

I have a function which works for the time zone for each location

func CheckTime()->Bool
{
  var timeExist: Bool
  let calendar = Calendar.current
  let startTimeComponent = DateComponents(calendar: calendar, hour: 9)
  let endTimeComponent   = DateComponents(calendar: calendar, hour: 12, minute: 01)
    
  let now = Date()
  let startOfToday = calendar.startOfDay(for: now)
  let startTime    = calendar.date(byAdding: startTimeComponent, to: startOfToday)!
  let endTime      = calendar.date(byAdding: endTimeComponent, to: startOfToday)!

  if startTime <= now && now <= endTime
  {
      button.isHidden = false
      timeExist = true
      print("9am-12pm")
      print(sydneyTime)
  }
  else
  {
      button.isHidden = true
      timeExist = false
      print("After 12:01pm")
      print(sydneyTime)
  }
    return timeExist
}

如何使用AEST(sydneyTime)而不是公历时间(Calendar)，以便该功能仅在AEST(GMT + 10)期间有效?

How do I use the AEST (sydneyTime) instead of the Gregorian time (Calendar) so the function works only during AEST (GMT+10)?

推荐答案

您可以使用日历方法 func dateComponents(在timeZone:TimeZone中，从日期:Date开始)->DateComponents 并获取所需时区的小时部分.然后，您只需要检查它是否包含在所需的小时范围内即可:

You can use Calendar method func dateComponents(in timeZone: TimeZone, from date: Date) -> DateComponents and get the hour component at the desired timezone. Then you just need to check if it is contained in the desired hour range:

let timeZone = TimeZone(secondsFromGMT: 36000)!
let hourInAEST = Calendar.current.dateComponents(in: timeZone, from: Date()).hour!

if 9..<12 ~= hourInAEST {
    print(true)
} else {
    print(false)
}

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