jstl

• forEach, if

<select name="ASTimeHH">
    <c:forEach var="ii" begin="0" end="24" step="1">
<option value="${ii}" <c:if test="${fn:substring(mainData.ACCEPT_START_YMD, 8, 10) == ii}">selected</c:if>>${ii}
        </option>
   </c:forEach>
</select>