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  1. PO
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    <p>The code is a bit difficult, but imho the following works well. Made two similar functions, first one is called onload to initialize all three selectboxes, the second one is called when the onchange event occurs:</p> <pre class="lang-js prettyprint-override"><code>function init_dates() { var now = new Date(); var newest = []; newest[0] = now.getFullYear(); newest[1] = now.getMonth() + 1; newest[2] = now.getDate(); var old = new Date(now.getTime() - 1095 * 86400 * 1000); var oldest = []; oldest[0] = old.getFullYear(); oldest[1] = old.getMonth() + 1; oldest[2] = old.getDate(); // YEARS var opt; var i = oldest[0]; var year = document.getElementById('year'); while (i &lt;= newest[0]) { opt = document.createElement('option'); opt.value = i; opt.innerHTML = i; if (i == newest[0]) { opt.selected = 'selected'; } year.appendChild(opt); i++; } // MONTHS var minmonth = (year.value == oldest[0]) ? oldest[1] : 1; var maxmonth = (year.value == newest[0]) ? newest[1] : 12; var month = document.getElementById('month'); while (minmonth &lt;= maxmonth) { opt = document.createElement('option'); opt.value = minmonth; opt.innerHTML = minmonth; month.appendChild(opt); minmonth++; } // DAYS var minday = (year.value == oldest[0] &amp;&amp; month.value == oldest[1]) ? oldest[2] : 1; var maxday = (year.value == newest[0] &amp;&amp; month.value == newest[1]) ? newest[2] : 33; if (maxday == 33) { // find correct maxday maxday = 27; var d = new Date(year.value, month.value - 1, maxday, 0, 0, 0, 0); while (d.getDate() &gt; 1) { maxday++; d = new Date(year.value, month.value - 1, maxday, 0, 0, 0, 0); } maxday--; } var day = document.getElementById('day'); while (minday &lt;= maxday) { opt = document.createElement('option'); opt.value = minday; opt.innerHTML = minday; day.appendChild(opt); minday++; } } function update_dates() { var now = new Date(); var newest = []; newest[0] = now.getFullYear(); newest[1] = now.getMonth() + 1; newest[2] = now.getDate(); var old = new Date(now.getTime() - 1095 * 86400 * 1000); var oldest = []; oldest[0] = old.getFullYear(); oldest[1] = old.getMonth() + 1; oldest[2] = old.getDate(); //selected date in selectboxes var year = document.getElementById('year'); var month = document.getElementById('month'); var day = document.getElementById('day'); var sel = new Date(year.value, month.value-1, day.value, 0,0,0,0); var selected = []; selected[0] = sel.getFullYear(); selected[1] = sel.getMonth() + 1; selected[2] = sel.getDate(); year.innerHTML = month.innerHTML = day.innerHTML = ''; //clear old list // YEARS var opt; var i = oldest[0]; while (i &lt;= newest[0]) { opt = document.createElement('option'); opt.value = i; opt.innerHTML = i; if (i == selected[0]) { opt.selected = 'selected'; } year.appendChild(opt); i++; } // MONTHS var minmonth = (year.value == oldest[0]) ? oldest[1] : 1; var maxmonth = (year.value == newest[0]) ? newest[1] : 12; while (minmonth &lt;= maxmonth) { opt = document.createElement('option'); opt.value = minmonth; opt.innerHTML = minmonth; if (minmonth== selected[1]) { opt.selected = 'selected'; } month.appendChild(opt); minmonth++; } // DAYS var minday = (year.value == oldest[0] &amp;&amp; month.value == oldest[1]) ? oldest[2] : 1; var maxday = (year.value == newest[0] &amp;&amp; month.value == newest[1]) ? newest[2] : 33; if (maxday == 33) { // find correct maxday maxday = 27; var d = new Date(year.value, month.value - 1, maxday, 0, 0, 0, 0); while (d.getDate() &gt; 1) { maxday++; d = new Date(year.value, month.value - 1, maxday, 0, 0, 0, 0); } maxday--; } while (minday &lt;= maxday) { opt = document.createElement('option'); opt.value = minday; opt.innerHTML = minday; day.appendChild(opt); if (minday == selected[2]) { opt.selected = 'selected'; } minday++; } } </code></pre> <p><a href="http://jsfiddle.net/gCDXs/1/" rel="nofollow">http://jsfiddle.net/gCDXs/1/</a></p>
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    1. POHow to populate drop down list box with certain calendar range values in javascript
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