不說廢話，直接上代碼：
<input id="d4311" class="Wdate" onfocus="WdatePicker({maxDate:'#F{$dp.$D(\'d4312\')||\'2020-10-01\'}'})" type="text" />
～
<input id="d4312" class="Wdate" onfocus="WdatePicker({minDate:'#F{$dp.$D(\'d4311\')}',maxDate:'2020-10-01'})" type="text" />