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    <p>Yes, you can! Suppose you have the following PrimeFaces's input fields:</p> <pre><code>&lt;p:calendar id="from" value="#{mrBean.fromDate}" binding="#{from}" &gt; &lt;p:ajax process="from to" update="toDateMsg" /&gt; &lt;/p:calendar&gt; &lt;p:calendar id="to" value="#{mrBean.toDate}" &gt; &lt;f:attribute name="fromDate" value="#{from.value}" /&gt; &lt;f:validator validatorId="validator.dateRangeValidator" /&gt; &lt;p:ajax process="from to" update="toDateMsg" /&gt; &lt;/p:calendar&gt; &lt;p:message for="to" id="toDateMsg" /&gt; </code></pre> <p>This should be your <code>Validator</code>:</p> <pre><code>@FacesValidator("validator.dateRangeValidator") public class DateRangeValidator implements Validator { @Override public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException { if (value == null || component.getAttributes().get("fromDate") == null) return; Date toDate = (Date) value; Date fromDate = (Date) component.getAttributes().get("fromDate"); if (toDate.after(fromDate)) { FacesMessage message = new FacesMessage("Invalid dates submitted."); message.setSeverity(FacesMessage.SEVERITY_ERROR); throw new ValidatorException(message); } } } </code></pre> <p>Note that I am using PrimeFaces's <code>&lt;p:calendar&gt;</code> component to write my example because the properties binded to this component will automatically be converted to <code>Date</code> object before being validated. In your program, you may have your own <code>Converter</code> to convert <code>String</code> to <code>Date</code>.</p>
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    1. COWhat if you change start date to be a wrong date after setting end date?
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    2. CO@BalusC: you're right :P. I missed that ^^
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    3. COWould be more helpful for the OP when you used normal `<h:inputText>`, `<f:convertDateTime>` and `<f:ajax>` though, but the point is clear. The validator class name can also be more self-describing than just "DateValidator", btw. Maybe "DateRangeValidator"?
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