@@ -229,11 +229,11 @@
 {
 	return [[[self alloc]
 	    initWithTimeIntervalSince1970: -62167219200.0] autorelease];
 }
 
-- init
+- (instancetype)init
 {
 	struct timeval t;
 
 	self = [super init];
 
@@ -243,30 +243,30 @@
 	_seconds += (of_time_interval_t)t.tv_usec / 1000000;
 
 	return self;
 }
 
-- initWithTimeIntervalSince1970: (of_time_interval_t)seconds
+- (instancetype)initWithTimeIntervalSince1970: (of_time_interval_t)seconds
 {
 	self = [super init];
 
 	_seconds = seconds;
 
 	return self;
 }
 
-- initWithTimeIntervalSinceNow: (of_time_interval_t)seconds
+- (instancetype)initWithTimeIntervalSinceNow: (of_time_interval_t)seconds
 {
 	self = [self init];
 
 	_seconds += seconds;
 
 	return self;
 }
 
-- initWithDateString: (OFString *)string
-	      format: (OFString *)format
+- (instancetype)initWithDateString: (OFString *)string
+			    format: (OFString *)format
 {
 	self = [super init];
 
 	@try {
 		const char *UTF8String = [string UTF8String];
@@ -286,12 +286,12 @@
 	}
 
 	return self;
 }
 
-- initWithLocalDateString: (OFString *)string
-		   format: (OFString *)format
+- (instancetype)initWithLocalDateString: (OFString *)string
+				 format: (OFString *)format
 {
 	self = [super init];
 
 	@try {
 		const char *UTF8String = [string UTF8String];
@@ -325,11 +325,11 @@
 	}
 
 	return self;
 }
 
-- initWithSerialization: (OFXMLElement *)element
+- (instancetype)initWithSerialization: (OFXMLElement *)element
 {
 	self = [super init];
 
 	@try {
 		void *pool = objc_autoreleasePoolPush();
@@ -387,11 +387,11 @@
 	OF_HASH_FINALIZE(hash);
 
 	return hash;
 }
 
-- copy
+- (id)copy
 {
 	return [self retain];
 }
 
 - (of_comparison_result_t)compare: (id <OFComparing>)object