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Java 8 Swing Date Picker. Easy to use, good looking, nice features, and localized. Uses the JSR-310 standard.

There is a newer version: 11.2.1

package com.github.lgooddatepicker.durationpicker_underconstruction;

import java.time.Duration;
import java.util.ArrayList;
import javax.swing.JComboBox;

/**
 * DurationPicker, This component allows a user to select a duration. Durations can be entered using
 * the mouse or keyboard.
 *
 * The picker can parse multiple formats. For example, when using English language units, all of the
 * following strings would be successfully parsed and stored as a duration: "1 minute", "1m", "2
 * hours", "2.732 hours", "5 days", "4 weeks", "3 months", "2 years". Even though multiple formats
 * can be parsed by the duration picker, all durations are converted to a standard format for
 * display.
 *
 * The duration picker will only display one unit at a time. For example, the duration picker may
 * display "9 days", but it will never display "1 week, 2 days".
 *
 * Actual months vary in length by month-of-year. Within the context of the "Duration" and
 * "DurationPicker" classes, the month and year units are defined using an average, fixed estimated
 * length. These estimates are supplied by the class "java.time.temporal.ChronoUnit". The estimated
 * duration of a year is 365.2425 Days (31556952L seconds). The estimated duration of a month is one
 * twelfth of 365.2425 Days (2629746L seconds).
 *
 * When representing a duration as a string, the duration picker will choose the largest unit that
 * is available for use, that divides evenly into the duration that is being represented. For
 * example, 14 days can display as "2 weeks", but 15 days will display as "15 days" (or as a smaller
 * unit if the settings indicate that the days unit should not be used.) If fractional durations are
 * entered by the user, this can result in large, unwieldy numbers being displayed. For example, if
 * the user entered 3.632 hours, then the duration picker would display this as 13075 seconds.
 *
 *
 *
 */
public class DurationPicker extends JComboBox {

    private DurationConverterSettings converterSettings;
    // Red border when text is in disallowed state. 
    private boolean allowEmptyDuration = true;
    private boolean allowZeroDuration = false;
    private Duration allowMinimumDuration = Duration.ofSeconds(0);
    // 4,000,000 days is a little over 10,000 years. 
    private Duration allowMaximumDuration = Duration.ofDays(4000000);


    public DurationPicker() {
        this(null);
        converterSettings = new DurationConverterSettings();
    }

    public DurationPicker(DurationConverterSettings converterSettings) {
        if(converterSettings == null) {
            converterSettings = new DurationConverterSettings(); 
        }
        this.converterSettings = converterSettings;
    }

    public void setDuration(Duration duration) {
        //Todo: implement setDuration().
    }

    public Duration getDuration() {
        return null;
        //Todo: implement getDuration().
    }

    public void setText(String text) {
        //Todo: implement setText().
    }

    public String getText() {
        return null;
        //Todo: implement getText().
    }

    public void setMenuItems(ArrayList menuItemDurations) {
        //Todo: implement setMenuItems().
    }

    public ArrayList getMenuItems() {
        return null;
        //Todo: implement getMenuItems().
    }

}