This javascript cut & paste code snippet will automatically detect the month and amount of days left within the current month. The viewer simply checks any date from the produced selection box if another date is needed. The date visibly seen automatically starts at the current date of the day entering page containing this script code.

Insert this code into your HEAD of HTML

<!-- // == This Script Free To Use Providing This Notice Remains == // // == This Script Has Been Found In The http://www.DesignerWiz.com Javascript Public Archive Library == // // == NOTICE: Though This Material May Have Been In A Public Depository, Certain Author Copyright Restrictions May Apply == // --><script language="JavaScript" type="text/javascript"> <!-- Original: Reaz Hoque <!-- Begin function customize(form) { var address = document.form1.url.value; var op_tool = (document.form1.tool.checked== true) ? 1 : 0; var op_loc_box = (document.form1.loc_box.checked == true) ? 1 : 0; var op_dir = (document.form1.dir.checked == true) ? 1 : 0; var op_stat = (document.form1.stat.checked == true) ? 1 : 0; var op_menu = (document.form1.menu.checked == true) ? 1 : 0; var op_scroll = (document.form1.scroll.checked == true) ? 1 : 0; var op_resize = (document.form1.resize.checked == true) ? 1 : 0; var op_wid = document.form1.wid.value; var op_heigh = document.form1.heigh.value; var option = "toolbar="+ op_tool +",location="+ op_loc_box +",directories=" + op_dir +",status="+ op_stat +",menubar="+ op_menu +",scrollbars=" + op_scroll +",resizable=" + op_resize +",width=" + op_wid +",height="+ op_heigh; var win3 = window.open("", "what_I_want", option); var win4 = window.open(address, "what_I_want"); } function clear(form) { document.form1.wid.value=""; document.form1.heigh.value=""; } // End --> </script>

Insert this code into your BODY section

<script language="JavaScript" type="text/javascript"> <!-- Begin today = new Date(); thismonth = today.getMonth()+1; thisyear = today.getYear(); thisday = today.getDate(); montharray=new Array(31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); maxdays=montharray[thismonth-1]; if (thismonth==2) { if ((thisyear/4)!=parseInt(thisyear/4)) maxdays=28; else maxdays=29; } thismonth = "" + thismonth if (thismonth.length == 1) { thismonth = "0" + thismonth; } document.write("<form>"); document.write("<select name=dates size=1>"); for (var theday = 1; theday <= maxdays; theday++) { var theday = "" + theday; if (theday.length == 1) { theday = "0" + theday; } document.write("<option"); if (theday == thisday) document.write(" selected"); document.write(">"); document.write(thismonth + "-" + theday + "-" + thisyear); } document.write("</select></form>"); // End --></script>

Example: 

Simply Cut and Paste Script code
Be sure to properly place script position in HEAD & BODY sections of html 

This script has been in the DesignerWiz.com Public Library.