- java
String timestamp = "1656777600";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String format = sdf.format(new Date(Long.valueOf(timestamp + "000")));
System.out.println(format);

String timestamp = "1656777600";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String format = sdf.format(new Date(Long.valueOf(timestamp + "000")));
System.out.println(format);