String date = new SimpleDateFormat("yyyy-MM-dd").format(new Date());

//导入Date类为java.util

 public static String getcurrentDateAndTime(){

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

// String currentdate=  getcurrentDateAndTime();

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); 
}

我尝试过这种方法，对我很有效。

val df = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ", Locale.getDefault()) // pass the format pattern that you like and done.
println(df.format(Date()))

Calendar cal = Calendar.getInstance();      
Calendar dt = Calendar.getInstance(); 
dt.clear();
dt.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH),cal.get(Calendar.DATE)); 
return dt.getTime();        

这是我使用的代码:

final Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);

// Set current date into textview
tvDisplayDate.setText(new StringBuilder()
    .append(month + 1).append("-") // Month is 0 based, add 1
    .append(day).append("-")
    .append(year).append("   Today is :" + thursday ) );

// Set current date into datepicker
dpResult.init(year, month, day, null);