code: public void setExpectedExpiryTime(com.google.api.ads.admanager.axis.v201811.DateTime expectedExpiryTime) {
          this.expectedExpiryTime = expectedExpiryTime;
      }
docs: Sets the expectedExpiryTime value for this Proposal.
  
  @param expectedExpiryTime   * The expected date and time at which the inventory reserved
  by the {@link Proposal} will expire.
  <span class="constraint Applicable">This attribute
  is applicable when:<ul><li>using programmatic guaranteed, using sales
  management.</li><li>not using programmatic, using sales management.</li></ul></span>
  <span class="constraint ReadOnly">This attribute is read-only when:<ul><li>using
  programmatic guaranteed, using sales management.</li><li>not using
  programmatic, using sales management.</li></ul></span>