====== getDateStringFromTime ======
  * Parameters and types:
     * time: numbertimestamp
  * Return value and type:
    * code: numberSuccess (ErrorCode.OK) ErrorCode
    * timestr: stringtime description
  * The main function of this method: Convert timestamp to completion time
  * The specific use cases are as follows:

<code>
local code, timestr = World:getDateStringFromTime(time)
if code == ErrorCode.OK then
print('Execution successful', code, timestr )
else
print('Execution failed')
end
</code>