function setReleaseTime(address _holder, uint256 _release_time)

    public

    onlyOwner

    returns (bool)

  {

    require(_holder != address(0));

	require(_release_time >= block.timestamp);



	uint256 old_release_time = userLock[_holder].release_time;



	userLock[_holder].release_time = _release_time;

	emit LockTimeSetted(_holder, old_release_time, userLock[_holder].release_time);

	return true;

  }