public long toDays(long duration)

// Java program to demonstrate
// toDays() method of TimeUnit Class
 
import java.util.concurrent.*;
import java.util.Date;
 
class GFG {
    public static void main(String args[])
    {
        // Get current time in milliseconds
        long timeInMilliSec = new Date().getTime();
 
        // Create a TimeUnit object
        TimeUnit time = TimeUnit.MILLISECONDS;
 
        // Convert milliseconds to days
        // using toDays() method
        System.out.println("Time " + timeInMilliSec
                           + " milliSeconds in Days = "
                           + time.toDays(timeInMilliSec));
    }
}

Time 1539585725051 milliSeconds in Days = 17819

// Java program to demonstrate
// toDays() method of TimeUnit Class
 
import java.util.concurrent.*;
import java.util.Calendar;
 
class GFG {
    public static void main(String args[])
    {
        // Get current time in milliseconds
        long timeInMilliSec = Calendar
                                  .getInstance()
                                  .getTimeInMillis();
 
        // Create a TimeUnit object
        TimeUnit time = TimeUnit.MILLISECONDS;
 
        // Convert milliseconds to days
        // using toDays() method
        System.out.println("Time " + timeInMilliSec
                           + " milliSeconds in Days = "
                           + time.toDays(timeInMilliSec));
    }
}

Time 1539585730178 milliSeconds in Days = 17819