试试这个,

SimpleDateFormat timeStampFormat = new SimpleDateFormat("yyyyMMddHHmmssSS");
Date myDate = new Date();
String filename = timeStampFormat.format(myDate);

此方法可用于从系统中获取当前日期。

public static String getCurrentDateAndTime(){
    Date c = Calendar.getInstance().getTime();
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd");
    String formattedDate = simpleDateFormat.format(c);
    return formattedDate;
}

这是我使用的代码:

             Date date = new Date();  // to get the date
             SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy"); // getting date in this format
             String formattedDate = df.format(date.getTime());
             text.setText(formattedDate);

In Kotlin you can use this code : - 

Simple only need to change date format to this "dd-MM-yyyy" 
val d = Date()
val str: CharSequence = DateFormat.format("dd-MM-yyyy", d.getTime())
Log.e("", str.toString())
    
In Java You use this code: - 
    
Date date = new Date();
CharSequence str  = DateFormat.format("dd-MM-yyyy", date.getTime());
Log.e("Date", str.toString())

这与android无关，因为它是基于java的，所以你可以使用

private String getDateTime() { 
   DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
   Date date = new Date(); 
   return dateFormat.format(date); 
}

在Kotlin

https://www.programiz.com/kotlin-programming/examples/current-date-time

fun main(args: Array<String>) {

val current = LocalDateTime.now()

val formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS")
val formatted = current.format(formatter)

println("Current Date and Time is: $formatted")}