将日期从epoch转换为date

java.time

• ofEpochDay

  LocalDate d = LocalDate.ofEpochDay(17749);
  System.out.println(d);                       // 2018-08-06
  

• EPOCH

  LocalDate.EPOCH.plusDays(17749);
  

String DateTimeFormatter

D SimpleDateFormat pattern

new Date(milliseconds)

long days = 17749;
Date d = new Date(days * 86400000L);

java.util.Date java.time.LocalDate java.time plusDays EPOCH

// ACTUALLY, THERE'S A BETTER WAY THAN THIS, SEE LINK AFTER CODE BLOCK
long days = 17749;
LocalDate d = LocalDate.EPOCH.plusDays(days);

ofEpochDay azro's answer