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import com.psddev.cms.tool.Tab;
import com.psddev.cms.tool.ToolPageContext;

public class TimeZonesTab implements Tab { 

    @Override
    public void onUpdate(ToolPageContext page, Object content) { }

    @Override
    public String getDisplayName() { 
        return "Local Times";
    }

    @Override
    public boolean shouldDisplay(Object o) { 
        return true;
    }

    @Override
    public void writeHtml(ToolPageContext page, Object o) throws IOException { 

        Map<String, String> timeZoneIdentifiers = new HashMap<>();
        timeZoneIdentifiers.put("New York", "America/New_York");
        timeZoneIdentifiers.put("Los Angeles", "America/Los_Angeles");
        timeZoneIdentifiers.put("Mexico City", "America/Mexico_City");

        page.writeStart("table");

            page.writeStart("tr");
                page.writeStart("th");
                    page.writeHtml("City");
                page.writeEnd(); /* th */
                page.writeStart("th");
                    page.writeHtml("Time");
                page.writeEnd(); /* th */
            page.writeEnd(); /* tr */

            for (String myTimeZone : timeZoneIdentifiers.keySet()) {
                page.writeStart("tr");
                    page.writeStart("td");
                        page.writeHtml(myTimeZone);
                    page.writeEnd(); /* td */
                    page.writeStart("td");
                        String localTime = displayTime(timeZoneIdentifiers.get(myTimeZone));
                        page.writeHtml(localTime);
                    page.writeEnd(); /* td */
                page.writeEnd(); /* tr */
            }
        page.writeEnd(); /* table */
    }

    private String displayTime(String timeZoneIdentifier) {
        Calendar localTime = new GregorianCalendar(TimeZone.getTimeZone(timeZoneIdentifier));
        localTime.setTimeInMillis(localTime.getTimeInMillis());
        int hour = localTime.get(Calendar.HOUR_OF_DAY);
        int minute = localTime.get(Calendar.MINUTE);
        return (hour + ":" + minute);
    }
}

• Declares the class TimeZonesTab as an implementation of Tab. Any class implementing this interface appears as a tab in the content edit form.
  
• Specifies the tab’s label text.
• Indicates the tab always appears in the content edit form. For an example of conditionally displaying the tab, see Conditionally displaying a tab.
  
• Two methods (writeHtml and displayTime) that generate a table of localized UTC times. For an explanation of these methods, see the snippet "Implementing a custom widget in content edit page."
  
  

@Override
public boolean shouldDisplay(Object content) {
    return (content instanceof Article); 
}

• Tests if the current object is of type Article; if so, Brightspot displays the custom tab.

@Override
public void onUpdate(ToolPageContext page, Object content) { 
    State state = State.getInstance(content); 
    updateFields(page, state); 
}

• Traps updates to the content edit form and receives an object representing the current page and another object representing the content.
• Instantiates a object corresponding to the current object.
• Passes the content and state objects to a private method (not shown) that updates the database.