我正在尝试将上午/下午的格式时间转换为24小时的格式时间
6:35 PM to 18:35
我在操场上尝试了这段代码,但似乎没有如果我花时间去工作,就可以工作
let dateAsString = "02/12/15, 6:35 PM"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "HH"
let date = dateFormatter.dateFromString(dateAsString) //returns nil
有人知道如何做到这一点吗?
谢谢。
只需使用NSDateFormatter和“ h:mm a”格式将其转换为日期,然后使用“ HH:mm”格式将其转换回字符串。请查看此date formatting guide,以使自己熟悉此材料。
let dateAsString = "6:35 PM"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "h:mm a"
let date = dateFormatter.dateFromString(dateAsString)
dateFormatter.dateFormat = "HH:mm"
let date24 = dateFormatter.stringFromDate(date!)
Swift 3
时间格式为24小时至12小时
let dateAsString = "13:15"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm"
let date = dateFormatter.date(from: dateAsString)
dateFormatter.dateFormat = "h:mm a"
let Date12 = dateFormatter.string(from: date!)
print("12 hour formatted Date:",Date12)
输出将采用12小时格式,日期:1:15 PM
时间格式12小时至24小时
let dateAsString = "1:15 PM"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "h:mm a"
let date = dateFormatter.date(from: dateAsString)
dateFormatter.dateFormat = "HH:mm"
let Date24 = dateFormatter.string(from: date!)
print("24 hour formatted Date:",Date24)
输出将是24小时格式的日期:13:15
Swift 3 *
将12小时(即上午和下午)转换为24小时的代码格式,其中包括-
小时:分钟:秒:上午/下午至小时:分钟:秒
func timeConversion24(time12: String) -> String {
let dateAsString = time12
let df = DateFormatter()
df.dateFormat = "hh:mm:ssa"
let date = df.date(from: dateAsString)
df.dateFormat = "HH:mm:ss"
let time24 = df.string(from: date!)
print(time24)
return time24
}
输入
07:05:45 PM
输出
19:05:45
类似
将24小时转换为12小时(即AM和PM)的代码格式,其中包括-
小时:分钟:秒至小时:分钟:秒:AM / PM
func timeConversion12(time24: String) -> String {
let dateAsString = time24
let df = DateFormatter()
df.dateFormat = "HH:mm:ss"
let date = df.date(from: dateAsString)
df.dateFormat = "hh:mm:ssa"
let time12 = df.string(from: date!)
print(time12)
return time12
}
输入
19:05:45
输出
07:05:45 PM
下面是该解决方案的快速3版本-
let dateAsString = "6:35:58 PM"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "h:mm:ss a"
let date = dateFormatter.date(from: dateAsString)
dateFormatter.dateFormat = "HH:mm:ss"
let date24 = dateFormatter.string(from: date!)
print(date24)
Swift版本3.0.2,Xcode版本8.2.1(8C1002)(12小时格式):
func getTodayString() -> String{
let formatter = DateFormatter()
formatter.dateFormat = "h:mm:ss a "
formatter.amSymbol = "AM"
formatter.pmSymbol = "PM"
let currentDateStr = formatter.string(from: Date())
print(currentDateStr)
return currentDateStr
}
输出: 12:41:42 AM
随时发表评论。谢谢
这里是其他方法的代码
对于Swift 3
func amAppend(str:String) -> String{
var temp = str
var strArr = str.characters.split{$0 == ":"}.map(String.init)
var hour = Int(strArr[0])!
var min = Int(strArr[1])!
if(hour > 12){
temp = temp + "PM"
}
else{
temp = temp + "AM"
}
return temp
}
我在这种情况下使用的功能是通过正常时间格式更新标签,然后将所选时间的24小时格式存储为其他任务。
这是我的代码...
func timeUpdate(sender: NSDate)
{
let timeSave = NSDateFormatter() //Creating first object to update time label as 12hr format with AM/PM
timeSave.timeStyle = NSDateFormatterStyle.ShortStyle //Setting the style for the time selection.
self.TimeShowOutlet.text = timeSave.stringFromDate(sender) // Getting the string from the selected time and updating the label as 1:40 PM
let timeCheck = NSDateFormatter() //Creating another object to store time in 24hr format.
timeCheck.dateFormat = "HH:mm:ss" //Setting the format for the time save.
let time = timeCheck.stringFromDate(sender) //Getting the time string as 13:40:00
self.timeSelectedForCheckAvailability = time //At last saving the 24hr format time for further task.
}
编写此函数后,您可以在从日期/时间选择器中选择时间的地方调用此函数。
谢谢,希望对您有所帮助。
let calendar = Calendar.current
let hours = calendar.component(.hour, from: Date())
let minutes = calendar.component(.minute, from: Date())
let seconds = calendar.component(.second, from: Date())