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    <p>Before you can compare dates, they must be dates... In your example they are both strings so try something like this : </p> <pre><code>function validateDate() { var one_day=1000*60*60*24; serverDateTime="2012-11-23 17:06:46"; txtDate.value="30-Nov-2012" var _dtSvr = Date.parse(serverDateTime); var _dtTxt = Date.parse(txtDate.value); if (((_dtTxt - _dtSvr)/one_day) &gt; 7){ alert("Appointment can be fixed for next seven days only from current day."); return false; }else{ return true; } } </code></pre> <p>Try this and change the values of txtDate.value. I also recommend that you do extra verification on the formats in order for your dates to be correctly understood. Have a look on <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date" rel="nofollow">MDN Date</a> for all the details of date/time in javascript</p> <p>EDIT</p> <p>I tried this exactly in the Chrome (v23.xxx) console :</p> <pre><code>function validateDate(serverDateTime, txtDate) { var dateDifference; pickedDate = Date.parse(txtDate.replace(/-/g, " ")); todaysDate = new Date(serverDateTime); todaysDate.setHours(0, 0, 0, 0); dateDifference = Math.abs(Number(todaysDate) - pickedDate); //7 Days=604800000ms if (dateDifference &gt; 604800000) { return false; } else { return true; } } </code></pre> <p>Then I tried this :</p> <pre><code>validateDate("2012-11-23 17:06:46", "30-Nov-2012") </code></pre> <p>which returns "true" and tried this : </p> <pre><code>validateDate("2012-11-23 17:06:46", "30-Dec-2012") </code></pre> <p>which returns "false"</p> <p>It looks like this answers your question and further issues are nothing to do with the algo but more like how your browser interprets it and how you manage it.</p>
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    1. POHow to check if a date falls within the next 7 days
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    1. CO_dtSvr NAN........_dtTxt NAN
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    2. CODid you read up on the link I provided to see the Date/Time formats accepted by your Javascript and see if there is not a culture specific issue? Most examples give here work for several people and browsers, why not yours?
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    3. COTo be more precise : what browser do you use (name and version)? I noticed differences between Firefox and Chrome... Somehow, I always forget about Internet Explorer ;)
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