<select name="t"> 
    <option value="<%=hour(time)%>:<%=minute(time)%>"><%=hour(time)%>:<%=minute(time)%></option> 
    <option   value= "<%=hour(time)%>:<%=minute(time)+1%>"><%=hour(time)%>:<%=minute(time)+1%></option> 
    <option   value= "<%=hour(time)%>:<%=minute(time)+2%>"><%=hour(time)%>:<%=minute(time)+2%></option> 
</select>