簡単なJavaScript日付計算アルゴリズム

 
  
 
  <br>var today=new Date(); //         
  <br>var year = today.getYear(); //     
  <br>var month = today.getMonth(); //     
  <br>var date = today.getDate(); //      
  <br>try{ 
  <br>//        ，     30  
  <br>var nextDay = new Date(year,month,date+30); 
  <br>//              
  <br>document.write(nextDay.getYear(),'<br>'); 
  <br>document.write(nextDay.getMonth()+1,'<br>'); 
  <br>document.write(nextDay.getDate(),'<br>'); 
  <br>}catch(e){ 
  <br>alert(e.message); 
  <br>} 
  <br>