매월 마지막 날자 구하기

http://oxtag.com/html/ex/ex/ex3.html

1. <SCRIPT LANGUAGE="JavaScript">
2. <!--
4. function hoho() {
6. Sdate = new Date()
8. Syy = ff.yy.options[ff.yy.selectedIndex].value ;
9. Smm = parseInt( ff.mm.options[ff.mm.selectedIndex].value ) + 1 ;
10. Sdate.setFullYear(Syy,Smm,0) ;
11. Endcount = Sdate.getDate() ;
13. // 지정된 실렉트박스의 옵션 갯수를 변경할 경우...
14. ff.dd.options.length = Endcount
16. for(i=0 ; i < Endcount ; i++) {
17.     ii = i + 1
18.     ff.dd.options[i].text = ii
19.     ff.dd.options[i].value = ii
20. }
21. }
22. //-->
23. </SCRIPT>
25. <center>
26. <br>
27. 매월 마지막 날짜 구하기 <br><br>
29. <FORM METHOD=POST ACTION="" name='ff'>
32. <SELECT NAME="yy" onChange = 'hoho()'>
33. <option value='2003'> 2003 </option>
34. <option value='2004'> 2004 </option>
35. <option value='2005'> 2005 </option>
36. <option value='2006'> 2006 </option>
37. <option value='2007'> 2007 </option>
38. </SELECT>
42. <SELECT NAME="mm" onChange = 'hoho()'>
43. <option value='0'> 1 </option>
44. <option value='1'> 2 </option>
45. <option value='2'> 3 </option>
46. <option value='3'> 4 </option>
47. <option value='4'> 5 </option>
48. <option value='5'> 6 </option>
49. <option value='6'> 7 </option>
50. <option value='7'> 8 </option>
51. <option value='8'> 9 </option>
52. <option value='9'> 10 </option>
53. <option value='10'> 11 </option>
54. <option value='11'> 12 </option>
55. </SELECT>
59. <SELECT NAME="dd" onChange = 'hoho()'>
60. <option value='1'>1</option>
61. <option value='2'>2</option>
62. <option value='3'>3</option>
63. <option value='4'>4</option>
64. <option value='5'>5</option>
65. <option value='6'>6</option>
66. <option value='7'>7</option>
67. <option value='8'>8</option>
68. <option value='9'>9</option>
69. <option value='10'>10</option>
70. <option value='11'>11</option>
71. <option value='12'>12</option>
72. <option value='13'>13</option>
73. <option value='14'>14</option>
74. <option value='15'>15</option>
75. <option value='16'>16</option>
76. <option value='17'>17</option>
77. <option value='18'>18</option>
78. <option value='19'>19</option>
79. <option value='20'>20</option>
80. <option value='21'>21</option>
81. <option value='22'>22</option>
82. <option value='23'>23</option>
83. <option value='24'>24</option>
84. <option value='25'>25</option>
85. <option value='26'>26</option>
86. <option value='27'>27</option>
87. <option value='28'>28</option>
88. <option value='29'>29</option>
89. <option value='30'>30</option>
90. <option value='31'>31</option>
91. </SELECT>
93. </FORM>