date - Javascript between Two Times -

i'm trying create javascript display on our website when our shop open, , when closed.

i want create if statement between 2 times, these being 8:30 , 5:30.

i'm doing following, although won't work have 2 lots of 'minutes' defined cancel each other out.

<script type="text/javascript">    var digital=new date();   var day=digital.getday();   var hours=digital.gethours();   var minutes=digital.getminutes();    // monday - open //   if (day==1 && hours>=8 && minutes>=30 && day==1 && hours<=17 && minutes<=30)   document.write('open today until 5:30pm');  </script> 

can suggest way of achieving trying do?

how this:

if(day == 1 && hours*60+minutes >= 510 && hours*60+minutes <= 1050) {     // stuff } 

with 8 * 60 + 30 = 510 , 17 * 60 + 30 = 1050.