Allow a space before time zone offset in timestamp literal

h2/src/main/org/h2/util/DateTimeUtils.java

@@ -476,6 +476,9 @@ public class DateTimeUtils {
                         throw new IllegalArgumentException(
                                 tzName + " (" + tz.getID() + "?)");
                     }
+                    if (s.charAt(timeZoneStart - 1) == ' ') {
+                        timeZoneStart--;
+                    }
                     timeEnd = timeZoneStart;
                 } else {
                     timeZoneStart = s.indexOf(' ', dateEnd + 1);

h2/src/test/org/h2/test/scripts/datatypes/timestamp-with-timezone.sql

@@ -26,3 +26,11 @@ SELECT * FROM tab_with_timezone ORDER BY X;
 > 2018-03-25 01:59:00.0+01
 > 2018-03-25 03:00:00.0+02
 > rows (ordered): 2
+
+SELECT TIMESTAMP WITH TIME ZONE '2000-01-10 00:00:00 -02' AS A,
+    TIMESTAMP WITH TIME ZONE '2000-01-10 00:00:00.000000000 +02:00' AS B,
+    TIMESTAMP WITH TIME ZONE '2000-01-10 00:00:00.000000000+02:00' AS C;
+> A                        B                        C
+> ------------------------ ------------------------ ------------------------
+> 2000-01-10 00:00:00.0-02 2000-01-10 00:00:00.0+02 2000-01-10 00:00:00.0+02
+> rows: 1