Move DateMathParser from instance variables to locals, so "now" is current time not startup time.

Clamp access condition dates to midnight UTC.
Add a lot of debug logging and a test main().

dspace-api/src/main/java/org/dspace/util/TimeHelpers.java

@@ -0,0 +1,42 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+package org.dspace.util;
+
+import java.util.Date;
+import java.util.GregorianCalendar;
+import java.util.TimeZone;
+
+/**
+ * Various manipulations of dates and times.
+ *
+ * @author mwood
+ */
+public class TimeHelpers {
+    private static final TimeZone UTC = TimeZone.getTimeZone("UTC");
+
+    /**
+     * Never instantiate this class.
+     */
+    private TimeHelpers() {}
+
+    /**
+     * Set a Date's time to midnight UTC.
+     *
+     * @param from some date-time.
+     * @return midnight UTC of the supplied date-time.
+     */
+    public static Date toMidnightUTC(Date from) {
+        GregorianCalendar calendar = new GregorianCalendar(UTC);
+        calendar.setTime(from);
+        calendar.set(GregorianCalendar.HOUR_OF_DAY, 0);
+        calendar.set(GregorianCalendar.MINUTE, 0);
+        calendar.set(GregorianCalendar.SECOND, 0);
+        calendar.set(GregorianCalendar.MILLISECOND, 0);
+        return calendar.getTime();
+    }
+}