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    <p>A few things to think about:</p> <ul> <li>"Is date x earlier than 3 months before today" isn't the same as "today is more than 3 months later than date x"; you'll need to make sure you have the exact semantics you want.</li> <li>Consider what you want to do with the time component - are you interested in <em>dates</em> or dates <em>and times</em>? (Would you expect the condition evaluation to change based on the current time of day?)</li> <li>Consider time zones: are you interested in "today in the system's current time zone" or some fixed time zone?</li> <li>Depending on the source of the text data, you should <em>possibly</em> use <code>DateTime.TryParse</code> and you should <em>possibly</em> use <code>DateTime.ParseExact</code> or <code>DateTime.TryParseExact</code>, passing in the expected format (and culture)</li> </ul> <p>Basically, there are various corner cases around date and time behaviour - you should explicitly think about all of these things (some of which are forced upon you if you use <a href="http://noda-time.googlecode.com" rel="noreferrer">Noda Time</a> instead of <code>DateTime</code>, btw :)</p> <p>Regarding the first point, if the idea is that you get a trial period of three months from the installation date (or something similar), that suggests you should be <em>adding</em> three months to that instead.</p> <p>I'd also change the variable name and get rid of the redundant parentheses, by the way:</p> <pre><code>DateTime installationDate = DateTime.Parse("1/5/2012 8:12:14 PM"); DateTime trialPeriodEnd = installationDate.AddMonths(3); if (trialPeriodEnd &gt; DateTime.Now) { // do something } </code></pre> <p>Assuming you're storing the installation date yourself somewhere, I would try to store it in some form which is less ambiguous - possibly even storing just a "ticks" value instead of a string. But assuming you <em>are</em> storing it yourself, you shouldn't need to use <code>TryParse</code> - it makes sense to go "bang" if you can't parse the value. I'd use <code>ParseExact</code>, probably with a <a href="http://msdn.microsoft.com/en-us/library/az4se3k1.aspx" rel="noreferrer">standard format specifier</a> of "o" (round trip).</p>
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