计算时差的快速问题

Question

我开发了一个函数，计算两个日期之间的时差，在函数

下面给出两个日期作为字符串

func calculateTimeDifference(startDate: String, endDate: String) -> Int {
print("START DATE 1: (startDate)")
print("END DATE 1: (endDate)")
let startDate = dateTimeFormatter.date(from: startDate)
let endDate = dateTimeFormatter.date(from: endDate)
print("START DATE 2: (startDate)")
print("END DATE 2: (endDate)")

guard let startDate = startDate,
let endDate = endDate else {
print("return 1")
return 0
}

let dateDifference = Calendar.current.dateComponents([.minute], from: startDate, to: endDate)
let minuteDifference = dateDifference.minute

guard let minuteDifference = minuteDifference else {
print("return 2")
return 0
}

//timeDifference = minuteDifference
print("TIME DIFFERENCE: (minuteDifference)")
return minuteDifference


}

和我使用的相应日期格式化器

var dateFormatter : DateFormatter {
let formatter = DateFormatter()
formatter.dateStyle = .short
return formatter
}
var timeFormatter : DateFormatter {
let formatter = DateFormatter()
formatter.timeStyle = .short
return formatter
}
var dateTimeFormatter: DateFormatter {
let formatter = DateFormatter()
formatter.dateFormat = "d, MMM y, HH:mm"
return formatter
}

也尝试在每个返回格式化器前添加:formatter.locale = Locale.current

那么现在的问题是，如果我在模拟器上尝试这段代码，它可以完美地工作，下面是使用模拟器在控制台的输出:

START DATE 1: 13, mag 2022, 11:36
END DATE 1: 13, mag 2022, 12:06
START DATE 2: Optional(2022-05-13 09:36:00 +0000)
END DATE 2: Optional(2022-05-13 10:06:00 +0000)

在物理设备上尝试时，输出如下:

START DATE 1: 13, mag 2022, 11:36
END DATE 1: 13, mag 2022, 12:06
START DATE 2: nil
END DATE 2: nil

Answer 1

我猜这与不同的语言环境有关，因为可能他是意大利

var dateTimeFormatter: DateFormatter {
let formatter = DateFormatter()
formatter.dateFormat = "d, MMM y, HH:mm"
formatter.locale = .init(identifier: "it_CH") // for italian locale
return formatter
}
calculateTimeDifference(startDate: "13, mag 2022, 11:36", endDate: "13, mag 2022, 12:06")

和结果

START DATE 1: 13, mag 2022, 11:36
END DATE 1: 13, mag 2022, 12:06
START DATE 2: Optional(2022-05-13 09:36:00 +0000)
END DATE 2: Optional(2022-05-13 10:06:00 +0000)
TIME DIFFERENCE: 30