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POHow to calculate difference between two date from DatePicker widget
 

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  1. POHow to calculate difference between two date from DatePicker widget
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    <p>I've a problem with my GWT project: i'm only interested to calculate the difference between two date (in days) from two DatePicker Widget.</p> <p>This is my code, i take it mainly from here: <a href="http://www.gwtproject.org/javadoc/latest/com/google/gwt/user/datepicker/client/DatePicker.html" rel="nofollow">http://www.gwtproject.org/javadoc/latest/com/google/gwt/user/datepicker/client/DatePicker.html</a></p> <pre><code> // Create a date picker "FROM: " final DatePicker datePicker1 = new DatePicker(); datePicker1.addValueChangeHandler(new ValueChangeHandler&lt;Date&gt;() { public void onValueChange(ValueChangeEvent&lt;Date&gt; event) { Date date1 = datePicker1.getValue(); } }); // Set the default value datePicker1.setValue(new Date(), true); // Create a date picker "TO: " final DatePicker datePicker2 = new DatePicker(); datePicker2.addValueChangeHandler(new ValueChangeHandler&lt;Date&gt;() { public void onValueChange(ValueChangeEvent&lt;Date&gt; event) { Date date2 = datePicker2.getValue(); } }); // Set the default value datePicker2.setValue(new Date(), true); // =================DEBUG=================== Button send = new Button("send", new ClickHandler(){ public void onClick(ClickEvent event) { //calculate difference between date1 and date2 days = (int) CalendarUtil.getDaysBetween(date1, date2); Window.alert("Differece: " + days); } }); </code></pre> <p>but while i have no error in eclipse, when i run the web application i have this error:</p> <pre><code>[ERROR] [progetto] Uncaught exception escaped com.google.gwt.event.shared.UmbrellaException: Exception caught: null [...] </code></pre> <p>I can write more error details if necessary but it's very long...</p> <p>Can you tell me how to fix this error or how to calculate it with an alternative methods?</p> <p>Thank you in advance.</p>
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