+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_ntoh (struct GNUNET_TIME_AbsoluteNBO a);
+
+
+/**
+ * Set the timestamp offset for this instance.
+ *
+ * @param offset the offset to skew the locale time by
+ */
+void
+GNUNET_TIME_set_offset (long long offset);
+
+
+/**
+ * Get the timestamp offset for this instance.
+ *
+ * @return the offset we currently skew the locale time by
+ */
+long long
+GNUNET_TIME_get_offset (void);
+
+
+/**
+ * Return the current year (i.e. '2011').
+ */
+unsigned int
+GNUNET_TIME_get_current_year (void);
+
+
+/**
+ * Convert a year to an expiration time of January 1st of that year.
+ *
+ * @param year a year (after 1970, please ;-)).
+ * @return absolute time for January 1st of that year.
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_year_to_time (unsigned int year);
+
+
+/**
+ * Convert an expiration time to the respective year (rounds)
+ *
+ * @param at absolute time
+ * @return year a year (after 1970), 0 on error
+ */
+unsigned int
+GNUNET_TIME_time_to_year (struct GNUNET_TIME_Absolute at);
+
+
+/**
+ * A configuration object.
+ */
+struct GNUNET_CONFIGURATION_Handle;
+
+
+/**
+ * Obtain the current time and make sure it is monotonically
+ * increasing. Guards against systems without an RTC or
+ * clocks running backwards and other nasty surprises. Does
+ * not guarantee that the returned time is near the current
+ * time returned by #GNUNET_TIME_absolute_get(). Two
+ * subsequent calls (within a short time period) may return the
+ * same value. Persists the last returned time on disk to
+ * ensure that time never goes backwards. As a result, the
+ * resulting value can be used to check if a message is the
+ * "most recent" value and replays of older messages (from
+ * the same origin) would be discarded.
+ *
+ * @param cfg configuration, used to determine where to
+ * store the time; user can also insist RTC is working
+ * nicely and disable the feature
+ * @return monotonically increasing time
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_get_monotonic (const struct GNUNET_CONFIGURATION_Handle *cfg);
+