我開發了一個函式來計算兩個日期之間的時間差，將兩個日期作為字串在函式下方
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
}
以及我正在使用的相應日期格式化程式
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
}
也嘗試在每個回傳格式化程式之前添加：formatter.locale = Locale.current
所以現在的問題是，如果我在模擬器上嘗試這段代碼，它可以完美運行，下面是使用模擬器在控制臺中的輸出：
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)
在物理設備上嘗試時，輸出是這樣的：
START DATE 1: 13, mag 2022, 11:36
END DATE 1: 13, mag 2022, 12:06
START DATE 2: nil
END DATE 2: nil
uj5u.com熱心網友回復：
我想這與不同的語言環境有關，因為May是Maggio意大利語
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")
和結果
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
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