[New] Allow to create PxW durations

utils/src/main/java/li/strolch/utils/time/PeriodDuration.java

@@ -464,6 +464,25 @@ public final class PeriodDuration implements TemporalAmount, Serializable, Compa
 		return period.isZero() && duration.isZero();
 	}
 
+	/**
+	 * Checks if all parts of this amount are zero except days, which must be a multiple of 7
+	 *
+	 * @return true if only the days are set, and are a multiple of 7
+	 */
+	public boolean isWeeks() {
+		return duration.isZero() && period.getYears() == 0 && period.getMonths() == 0 && period.getDays() % 7 == 0;
+	}
+
+	/**
+	 * Returns the number of weeks defined by the days which are a multiple of 7, i.e. if the days value is 14, then it
+	 * returns 2 for the weeks.
+	 *
+	 * @return the number of weeks represented by the days
+	 */
+	public int getWeeks() {
+		return period.getDays() / 7;
+	}
+
 	//-----------------------------------------------------------------------
 
 	/**
@@ -707,8 +726,11 @@ public final class PeriodDuration implements TemporalAmount, Serializable, Compa
 			return duration.toString();
 		}
 		if (duration.isZero()) {
+			if (isWeeks())
+				return "P" + getWeeks() + "W";
 			return period.toString();
 		}
+
 		return period + duration.toString().substring(1);
 	}
 

utils/src/main/java/li/strolch/utils/time/PeriodDurationFormatter.java

@@ -36,7 +36,10 @@ public class PeriodDurationFormatter {
 
 		u = (int) periodDuration.get(ChronoUnit.DAYS);
 		if (u > 0) {
-			sb.append(u).append(" ").append(i18n(locale, "days"));
+			if (u % 7 == 0)
+				sb.append(u / 7).append(" ").append(i18n(locale, "weeks"));
+			else
+				sb.append(u).append(" ").append(i18n(locale, "days"));
 			periodDuration = periodDuration.minus(Period.ofDays(u));
 
 			if (periodDuration.isZero())

utils/src/main/resources/strolch-utils.properties

@@ -11,6 +11,7 @@ Fr=Fr
 Sa=Sa
 Su=Su
 days=Days
+weeks=Weeks
 months=Months
 years=Years
 minutes=Minutes

utils/src/main/resources/strolch-utils_de.properties

@@ -11,6 +11,7 @@ Fr=Fr
 Sa=Sa
 Su=So
 days=Tage
+weeks=Wochen
 months=Monate
 years=Jahre
 minutes=Minuten