Index: src/OFDate.h
==================================================================
--- src/OFDate.h
+++ src/OFDate.h
@@ -287,17 +287,21 @@
 - (OFString*)localDateStringWithFormat: (OFConstantString*)format;
 
 /*!
  * @brief Returns the earlier of the two dates.
  *
+ * 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;
 
 /*!
  * @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;

Index: src/OFDate.m
==================================================================
--- src/OFDate.m
+++ src/OFDate.m
@@ -605,18 +605,24 @@
 	return ret;
 }
 
 - (OFDate*)earlierDate: (OFDate*)otherDate
 {
+	if (otherDate == nil)
+		return [[self retain] autorelease];
+
 	if ([self compare: otherDate] == OF_ORDERED_DESCENDING)
 		return [[otherDate retain] autorelease];
 
 	return [[self retain] autorelease];
 }
 
 - (OFDate*)laterDate: (OFDate*)otherDate
 {
+	if (otherDate == nil)
+		return [[self retain] autorelease];
+
 	if ([self compare: otherDate] == OF_ORDERED_ASCENDING)
 		return [[otherDate retain] autorelease];
 
 	return [[self retain] autorelease];
 }