两个日期之间的差异没有迅速显示秒 [英] difference between two dates not showing seconds in swift
问题描述
在此处输入图片描述我有两个日期格式的日期.以下代码可查找两个日期之间的时差.
enter image description hereI have two dates in Date format.I have used the following code to find the difference between two dates.
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 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" }
return ""
}
func offsetLong(from date: Date) -> String {
if years(from: date) > 0 { return years(from: date) > 1 ? "\(years(from: date)) yrs ago" : "\(years(from: date)) yr ago" }
if months(from: date) > 0 { return months(from: date) > 1 ? "\(months(from: date)) mo ago" : "\(months(from: date)) mo ago" }
if weeks(from: date) > 0 { return weeks(from: date) > 1 ? "\(weeks(from: date)) wks ago" : "\(weeks(from: date)) wk ago" }
if days(from: date) > 0 { return days(from: date) > 1 ? "\(days(from: date)) days ago" : "\(days(from: date)) day ago" }
if hours(from: date) > 0 { return hours(from: date) > 1 ? "\(hours(from: date)) hrs ago" : "\(hours(from: date)) hr ago" }
if minutes(from: date) > 0 { return minutes(from: date) > 1 ? "\(minutes(from: date)) mins ago" : "\(minutes(from: date)) min ago" }
if seconds(from: date) > 0 { return seconds(from: date) > 1 ? "\(seconds(from: date)) secs ago" : "\(seconds(from: date)) sec ago" }
return ""
}
}
我已在EDT时区的两个日期应用了此扩展名，如下所示:
I have applied this extension on two dates in EDT timezone and it is as given below:
let dateFormatterGet = DateFormatter()
// dateFormatterGet.timeZone = TimeZone(abbreviation: "UTC")
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dateFormatterPrint = DateFormatter()
// dateFormatterPrint.timeZone = TimeZone(abbreviation: "UTC")
dateFormatterPrint.dateFormat = "yyyy-MM-dd HH:mm:ss"
let date1: Date? = dateFormatterGet.date(from: date) as Date?
// print("date1 is",date1)
let now = Date()
let dateFormatterGet1 = DateFormatter()
dateFormatterGet1.timeZone = TimeZone(abbreviation: "EDT")
dateFormatterGet1.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dateFormatterPrint1 = DateFormatter()
dateFormatterPrint1.timeZone = TimeZone(abbreviation: "EDT")
dateFormatterPrint1.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dat = dateFormatterPrint1.string(from: now) as String
let date2: Date? = dateFormatterGet1.date(from: dat) as Date?
let timeOffset3 = date2!.offsetLong(from: date1!)
cell2.dateposted.text = timeOffset3
时间偏移值显示到几小时，而不是分钟或秒.谁能告诉我这次转换有什么问题吗?
The time offset value is showing till hours, it is not showing in minutes or seconds. Could anyone tell me what is wrong in this conversion?
推荐答案
有一个内置类 DateComponentsFormatter ，它将根据时间间隔或一对日期创建格式化的字符串.您可以使用所需的单位和所需的样式来配置它，其余的工作就由它来完成.它仅提供某些预设格式(由DateComponentsFormatter.UnitsStyle指定)
There is a built in class, DateComponentsFormatter, that will create formatted strings from either time intervals or a pair of dates. You configure it with the units you want and the units style you want and it does the rest. It only offers certain pre-set formats (specified with a DateComponentsFormatter.UnitsStyle)
如果要以任意格式显示两个日期之间的时差，则可能需要使用 Calendar 函数 dateComponents(_:from:to:).该函数需要两个日期和要使用的一组组件，并返回一个DateComponents对象.然后，您需要编写自定义代码，以所需的格式显示 DateComponents 对象的值，这并不难.
If you want to display the difference between two dates in an arbitrary format then you may need to use the Calendar function dateComponents(_:from:to:). That function takes two dates and a set of the components you want to use, and returns a DateComponents object. You'd then need to write custom code that displayed the value of your DateComponents object in your desired format, which should't be that hard.
如果您在问题中解释了所需的输出，将会很有帮助.
It would help if you explained your desired output in your question.
好，我看了看图片.看起来您想要一个类似"3分钟前"的字符串."7小时前"三天前"，三个月前"等.
Ok, I looked at the image. It looks like you want a string like "3 minutes ago" "7 hours ago" "Three days ago", "three months ago", etc.
尝试这样的代码:
import Foundation
var timeFormatter:DateComponentsFormatter = {
let temp = DateComponentsFormatter()
temp.allowedUnits = [.year, .month, .weekOfMonth, .day, .hour, .minute, .second]
temp.maximumUnitCount = 1
temp.unitsStyle = .full
return temp
}()
let now = Date()
func timefromDateToNow(_ date: Date) -> String {
if let output = timeFormatter.string(from: date, to: now) {
return output + " ago"
} else {
return "error"
}
}
enum Ranges: Int, CaseIterable {
case seconds
case minutes
case hours
case days
case weeks
case months
case years
}
for _ in 1 ... 20 {
var min: Double
var max: Double = 0
let range = Ranges.allCases.randomElement()!
switch range {
case .seconds:
min = -59.999
case .minutes: //0 ... 1 hours
min = -3600
case .hours: //0 ... 1 day
min = -86400
case .days: //0 ... 1 month
min = -3600 * 24 * 31
case .weeks:
min = -3600 * 24 * 31
max = -3600 * 24 * 7
case .months:
min = -3600 * 24 * 365
case .years: // 0 ... 5 years
min = -3600 * 24 * 365 * 5
}
let past = now.addingTimeInterval(Double.random(in: min ... max))
print("Range = \(range): \(timefromDateToNow(past))")
}
var units: NSCalendar.Unit
//Note that all 3 methods of populating `units' yields the same value:
print("\nNow show that the order of OptionSet values does not matter:\n")
units = [.year, .second, .month, .hour]
print(units.rawValue)
units = [.second, .hour, .month, .year]
print(units.rawValue)
units = NSCalendar.Unit( rawValue:
NSCalendar.Unit.month.rawValue +
NSCalendar.Unit.year.rawValue +
NSCalendar.Unit.second.rawValue +
NSCalendar.Unit.hour.rawValue
)
print(units.rawValue)
这样会生成如下输出:
Range = years: 3 years ago
Range = seconds: 56 seconds ago
Range = months: 9 months ago
Range = minutes: 27 minutes ago
Range = minutes: 34 minutes ago
Range = hours: 15 hours ago
Range = years: 1 year ago
Range = months: 2 months ago
Range = years: 1 year ago
Range = years: 3 years ago
Range = years: 3 years ago
Range = years: 3 years ago
Range = years: 2 months ago
Range = years: 2 years ago
Range = seconds: 59 seconds ago
Range = days: 6 days ago
Range = weeks: 3 weeks ago
Range = years: 11 months ago
Range = hours: 16 hours ago
Range = hours: 7 hours ago
Now show that the order of OptionSet values does not matter:
172
172
172
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