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diff --git a/src/net/sourceforge/plantuml/project/DayOfWeek.java b/src/net/sourceforge/plantuml/project/DayOfWeek.java
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+/* ========================================================================
+ * PlantUML : a free UML diagram generator
+ * ========================================================================
+ *
+ * (C) Copyright 2009-2020, Arnaud Roques
+ *
+ * Project Info:  http://plantuml.com
+ * 
+ * If you like this project or if you find it useful, you can support us at:
+ * 
+ * http://plantuml.com/patreon (only 1$ per month!)
+ * http://plantuml.com/paypal
+ * 
+ * This file is part of PlantUML.
+ *
+ * PlantUML is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * PlantUML distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ *
+ * Original Author:  Arnaud Roques
+ * 
+ *
+ */
+package net.sourceforge.plantuml.project;
+
+import net.sourceforge.plantuml.StringUtils;
+import net.sourceforge.plantuml.project.lang.Complement;
+import net.sourceforge.plantuml.project.lang.Subject;
+
+public enum DayOfWeek implements Subject, Complement {
+
+	MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY;
+
+	static public String getRegexString() {
+		final StringBuilder sb = new StringBuilder();
+		for (DayOfWeek day : DayOfWeek.values()) {
+			if (sb.length() > 0) {
+				sb.append("|");
+			}
+			sb.append(day.name().substring(0, 3) + "[a-z]*");
+		}
+		return sb.toString();
+	}
+
+	public static DayOfWeek fromString(String value) {
+		value = StringUtils.goUpperCase(value).substring(0, 3);
+		for (DayOfWeek day : DayOfWeek.values()) {
+			if (day.name().startsWith(value)) {
+				return day;
+			}
+		}
+		throw new IllegalArgumentException();
+	}
+
+	public DayOfWeek next() {
+		return DayOfWeek.values()[(ordinal() + 1) % 7];
+	}
+
+	public static DayOfWeek fromH(int h) {
+		return DayOfWeek.values()[(h + 5) % 7];
+	}
+
+	public String shortName() {
+		return StringUtils.capitalize(name().substring(0, 2));
+	}
+}