使用各种格式将时间戳转换为日期Swift iOS

码：-

let addedTime = dictMessage?.object(forKey: "added_time") as? String let timeinterval : TimeInterval = (addedTime as NSString).doubleValu let dateFromServer = NSDate(timeIntervalSince1970:timeinterval) let dateFormater : DateFormatter = DateFormatter() dateFormater.dateFormat = "dd-MMM-yyyy hh:mm a" cellDetailsShop.lblTimeShop?.text = dateFormater.string(from: dateFromServer as Date) 

我有一个json和json我得到Timestamp我已经转换为Date.Date，我收到它显示的格式为"dd-MMM-yyyy hh:mm a" 。但我想显示日期，就像日期是今天它将显示： Today 04:55 PM ，如果日期是昨天，那么我将显示如下： Yesterday 5 PM ，如果在那之前它应该显示，因为我从JSON检索。 我搜索了各种链接但找不到答案。有人可以帮我。谢谢。

Answer 1

从日历对象开始，如果日期是今天或昨天，您可以获得。 基于此，您可以根据需要设置String。 我已经创建了一个你需要的例子。 下面是代码。

 var yesterdayStr = "17-Jan-2018 10:23 AM" var todayStr = "18-Jan-2018 10:23 AM" var tomorrowStr = "19-Jan-2018 10:23 AM" let dateFormatter = DateFormatter() dateFormatter.dateFormat = "dd-MMM-yyyy hh:mm a" let yesterDaydate = dateFormatter.date(from: yesterdayStr) let todayDate = dateFormatter.date(from: todayStr) let tomorrowDate = dateFormatter.date(from: tomorrowStr) let anotherDateFormatter = DateFormatter() anotherDateFormatter.dateFormat = "hh:mm a" if Calendar.current.isDateInYesterday(yesterDaydate!) { let yesterdayDisplayString = "Yesterday, " + anotherDateFormatter.string(from: yesterDaydate!) } if Calendar.current.isDateInToday(todayDate!) { let todayDisplayString = "Today, " + anotherDateFormatter.string(from: todayDate!) } if Calendar.current.isDateInToday(tomorrowDate!) { } else { let anotherDisplayString = anotherDateFormatter.string(from: tomorrowDate!) } 

这是输出，

Answer 2

你可以这样做。

 let addedTime = dictMessage?.object(forKey: "added_time") as? String let timeinterval : TimeInterval = (addedTime as NSString).doubleValue let dateFromServer = NSDate(timeIntervalSince1970:timeinterval) let dateFormater : DateFormatter = DateFormatter() if Calendar.current.isDateInToday(dateFromServer) { dateFormater.dateFormat = "'Today' hh:mm a" } else if Calendar.current.isDateInYesterday(dateFromServer) { dateFormater.dateFormat = "'Yesterday' hh:mm a" } else { dateFormater.dateFormat = "dd-MMM-yyyy hh:mm a" } cellDetailsShop.lblTimeShop?.text = dateFormater.string(from: dateFromServer as Date) 

如果您有任何意见，请告诉我。

谢谢。

Answer 3

使用以下代码

  func relativeDate(for date:Date) -> String { let components = Calendar.current.dateComponents([.day, .year, .month, .weekOfYear], from: date, to: Date()) if let year = components.year, year == 1{ return "\(year) year ago" } if let year = components.year, year > 1{ return "\(year) years ago" } if let month = components.month, month == 1{ return "\(month) month ago" } if let month = components.month, month > 1{ return "\(month) months ago" } if let week = components.weekOfYear, week == 1{ return "\(week) week ago" } if let week = components.weekOfYear, week > 1{ return "\(week) weeks ago" } if let day = components.day{ if day > 1{ return "\(day) days ago" }else{ "Yesterday" } } return "Today" } 

Answer 4

如果您可以在没有自定义日期格式的情况下执行此操作，则DateFormatter提供本地化的相 日期格式考虑“系统偏好设置”中的设置。

 let dateFromServer = Date(timeIntervalSinceNow: -100000) let dateFormatter = DateFormatter() dateFormatter.doesRelativeDateFormatting = true dateFormatter.timeStyle = .short dateFormatter.dateStyle = .short let string = dateFormatter.string(from: dateFromServer) 

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请不要在Swift中使用Foundation NSString和NSDate ，使用本机结构

 if let addedTime = dictMessage?["added_time"] as? String, let timeinterval = TimeInterval(addedTime) { let dateFromServer = Date(timeIntervalSince1970:timeinterval) let dateFormater = DateFormatter() ... }