如何使用 SwiftDate 框架在当前时区打印日期和时间（本地化）

Question

I'm using SwiftDate framework (see link below) https://github.com/malcommac/SwiftDate

I'd like to print the date and time in current region/local/timeZone. I can achieve this by using the below code without using SwiftDate:

DateFormatter.localizedString(from: Date(), dateStyle: .short, timeStyle: .short)

Since, SwiftDate provides a shared date formatter. I'd like to know if the same is possible with SwiftDate.

Answer 1

I use an extension to get localized date:

import SwiftDate

extension Date {

//you can specify region/timezone/locale to what you want
    var localizedDate: DateInRegion {
        return self.in(region: Region(calendar: Calendar.current, zone: Zones.current, locale: Locale.current))
    }
}

Then you use it like this (if you need system localized date, just ommit extension part):

let dateString = Date().localizedDate.toString(.custom("dd.MM.yyyy."))

Answer 2

I tried predrag-samardzic code and it worked. Now that there are two options (to do the same job), one with NSDateFormatter and the other with SwiftDate, I thought of profiling them to see which one is better. Here's the code that I used to profile them:

func testNSDateFormatter() {
    for _ in 1...10000 {
        print("\(Date().toLocalizedString())")
    }
}

func testSwiftDate() {
    for _ in 1...10000 {
        print("\(Date().localizedDate.toString(.dateTime(.short)))")
    }
}

extension Date {
    func toLocalizedString(dateStyle: DateFormatter.Style = .short, timeStyle: DateFormatter.Style = .short) -> String {
        return DateFormatter.localizedString(from: self, dateStyle: dateStyle, timeStyle: timeStyle)
    }

    var localizedDate: DateInRegion {
         return self.in(region: Region(calendar: Calendar.current, zone: Zones.current, locale: Locale.current))
    }
}

Here's the screenshot from the profiler.

The result of profiling:

NSDateFormatter - 773x SwiftDate - 2674x

NSDateFormatter is approximately 3.45 times faster than SwiftDate. Based on the above, I'd recommend using NSDateFormatter over SwiftDate.