date_timestamp_set(object,timestamp)

<?php
   date = new DateTime();res = date_timestamp_set(date, 1505292545);     print("Date: ".date_format(res, "Y/m/d H:i:s"));
?>

Date: 2017/09/13 08:49:05

<?php
   date = new DateTime();timestamp1 = time() - (23*12*30);   
   res1 = date_timestamp_set(date, timestamp1);        print("Date: ".date_format(res1, "Y/m/d H:i:s"));
   print("\n");
   timestamp2 = time() + (23*12*30);res2 = date_timestamp_set(date,timestamp2);  
   print("Date: ".date_format($res2, "Y/m/d H:i:s"));
?>

Date: 2020/05/11 08:57:30
Date: 2020/05/11 13:33:30

<?php
  date = new DateTime("@1495283256");
   print("Date: ".date_format(date, "Y/m/d H:i:s"));?>

Date: 2020/05/11 00:15:36