@@ -305,21 +305,21 @@
  * If the argument is `nil`, it returns the receiver.
  *
  * @param otherDate Another date
  * @return The earlier date of the two dates
  */
-- (OFDate *)earlierDate: (OFDate *)otherDate;
+- (OFDate *)earlierDate: (nullable OFDate *)otherDate;
 
 /*!
  * @brief Returns the later of the two dates.
  *
  * If the argument is `nil`, it returns the receiver.
  *
  * @param otherDate Another date
  * @return The later date of the two dates
  */
-- (OFDate *)laterDate: (OFDate *)otherDate;
+- (OFDate *)laterDate: (nullable OFDate *)otherDate;
 
 /*!
  * @brief Returns the seconds since 1970-01-01T00:00:00Z.
  *
  * @return The seconds since 1970-01-01T00:00:00Z