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    <p>The following is an example of how to calculate a future date based on date input (membershipssignup_date) + added months (membershipsmonths) via form fields.</p> <p>The membershipsmonths field has a default value of 0</p> <p>Trigger link (can be an onchange event attached to membership term field):</p> <pre><code>&lt;a href="#" onclick="calculateMshipExp()"; return false;"&gt;Calculate Expiry Date&lt;/a&gt; function calculateMshipExp() { var calcval = null; var start_date = document.getElementById("membershipssignup_date").value; var term = document.getElementById("membershipsmonths").value; // Is text value var set_start = start_date.split('/'); var day = set_start[0]; var month = (set_start[1] - 1); // January is 0 so August (8th month) is 7 var year = set_start[2]; var datetime = new Date(year, month, day); var newmonth = (month + parseInt(term)); // Must convert term to integer var newdate = datetime.setMonth(newmonth); newdate = new Date(newdate); //alert(newdate); day = newdate.getDate(); month = newdate.getMonth() + 1; year = newdate.getFullYear(); // This is British date format. See below for US. calcval = (((day &lt;= 9) ? "0" + day : day) + "/" + ((month &lt;= 9) ? "0" + month : month) + "/" + year); // mm/dd/yyyy calcval = (((month &lt;= 9) ? "0" + month : month) + "/" + ((day &lt;= 9) ? "0" + day : day) + "/" + year); // Displays the new date in a &lt;span id="memexp"&gt;[Date]&lt;/span&gt; // Note: Must contain a value to replace eg. [Date] document.getElementById("memexp").firstChild.data = calcval; // Stores the new date in a &lt;input type="hidden" id="membershipsexpiry_date" value="" name="membershipsexpiry_date"&gt; for submission to database table document.getElementById("membershipsexpiry_date").value = calcval; } </code></pre>
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    1. POJavaScript function to add X months to a date
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