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copied!<p>I was disappointed with the other answers. Joda time didn't work in GWT and neither does SimpleDateFormat. Anyway, I already knew about DateTimeFormat in GWT. The main issue is that date objects getMonth() function is deprecated, and there doesn't seem to be a good way to compare months and/or years. This solution doesn't include year checking (which could be easily added by changing the monthFormatter), but that's not important for my case.</p> <pre><code>public final class DateUtility { public static final DateTimeFormat MONTH_FORMAT = DateTimeFormat.getFormat("MMM"); public static final DateTimeFormat DAY_FORMAT = DateTimeFormat.getFormat("dd"); public static final DateTimeFormat DAY_MONTH_FORMAT = DateTimeFormat.getFormat("dd MMM"); public static final String DASH = " - "; /** * Returns a "collapsed" date range String representing the period of time * between two Date parameters. Example: August 19 as a {@code startDate} * and August 30 as an {@code endDate} will return "19 - 30 AUG", August 28 * as a {@code startDate} and September 7 as an {@code endDate} will return * "28 AUG - 07 SEP". This means if you pass this two dates which cannot * collapse into a shorter form, then the longer form is returned. Years * are ignored, and the start and end dates are not checked to ensure we * are not going backwards in time (Aug 10 - July 04 is not checked). * * @param startDate * the start Date in the range. * @param endDate * the end Date in the range. * @return a String representation of the range between the two dates given. */ public static String collapseDate(Date startDate, Date endDate) { String formattedDateRange; // Get a comparison result to determine if the Months are the same String startDateMonth = MONTH_FORMAT.format(startDate); String endDateMonth = MONTH_FORMAT.format(endDate); if (startDateMonth.equals(endDateMonth)) { formattedDateRange = DAY_FORMAT.format(startDate) + DASH + DAY_MONTH_FORMAT.format(endDate).toUpperCase(); } else { // Months don't match, split the string across both months formattedDateRange = DAY_MONTH_FORMAT.format(startDate).toUpperCase() + DASH + DAY_MONTH_FORMAT.format(endDate).toUpperCase(); } return formattedDateRange; } } </code></pre>

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