diff --git a/chatdir.scm b/chatdir.scm
index 2784082..6670002 100644
--- a/chatdir.scm
+++ b/chatdir.scm
@@ -339,6 +339,46 @@
   (directory (subpath root channel)))
 
 
+;; List all messages that have the given xattr set to the given value.
+(define (channel-messages-by-xattr root channel xattr value)
+  (filter
+   (lambda (message-leaf)
+	 (string=? (get-xattr (subpath root channel message-leaf)
+						  xattr)
+			   value))
+   (channel-messages root channel)))
+
+
+;; List all messages from the given sender.
+(define (channel-messages-by-sender root channel sender)
+  (channel-messages-by-xattr root channel "user.chat.sender" sender))
+
+
+;; List all messages sent at exactly the given date.
+(define (channel-messages-by-date root channel date)
+  (channel-messages-by-xattr root channel "user.chat.date"
+							 (date->string date "~1T~2")))
+
+
+;; List all messages sent around the given date, ±deviation seconds.
+(define (channel-messages-by-date* root channel date deviation)
+  (channel-messages-by-date-range root channel
+								  (seconds->date (- (date->seconds date) deviation))
+								  (seconds->date (+ (date->seconds date) deviation))))
+
+
+;; List all messages sent within the given date range.
+(define (channel-messages-by-date-range root channel min-date max-date)
+  (filter
+   (lambda (message-leaf)
+	 (let* ([message-path (subpath root channel message-leaf)]
+			[message-date (string->date (get-xattr message-path "user.chat.date")
+										"~Y-~m-~dT~H:~M:~S~z")])
+	   (and (date<=? min-date message-date)
+			(date<=? message-date max-date))))
+   (channel-messages root channel)))
+
+
 ;; Initialization for the input loop
 (define (input-loop-init root-dir callbacks-alist)
   (let ([join-callback (alist-ref 'join-channel callbacks-alist)])
diff --git a/tests/tests.scm b/tests/tests.scm
index cb03089..e77558c 100644
--- a/tests/tests.scm
+++ b/tests/tests.scm
@@ -71,8 +71,27 @@
 (define *msg-date* (current-date))
 (define *msg-xattr* '(user.bovo . "muuuu"))
 (define *msg-name* (message-file-leaf *dir* *room* *msg-date*))
-
 (channel-message-add! *dir* *room* *msg-text* *msg-sender* *msg-date* `(,*msg-xattr*))
+
+(define *msg-sender-2* "bildinto")
+(define *msg-text-2* "he? ĉu vi bonsanas?")
+(define *msg-date-2* *msg-date*)
+(define *msg-name-2* (message-file-leaf *dir* *room* *msg-date-2*))
+(channel-message-add! *dir* *room* *msg-text-2* *msg-sender-2* *msg-date-2*)
+
+(define *msg-sender-3* *msg-sender*)
+(define *msg-text-3* "feliĉan novjaron! =w= :D ^_^")
+(define *msg-date-3* (string->date "2023-01-01 00:01:00" "~Y-~m-~d ~H:~M:~S"))
+(define *msg-name-3* (message-file-leaf *dir* *room* *msg-date-3*))
+(channel-message-add! *dir* *room* *msg-text-3* *msg-sender-3* *msg-date-3*)
+
+(define *msg-sender-4* *msg-sender-2*)
+(define *msg-text-4* "certainly! :D")
+(define *msg-date-4* (string->date "2023-01-02 21:43:09" "~Y-~m-~d ~H:~M:~S"))
+(define *msg-name-4* (message-file-leaf *dir* *room* *msg-date-4*))
+(channel-message-add! *dir* *room* *msg-text-4* *msg-sender-4* *msg-date-4*)
+
+
 (check (directory-file-get* (subpath *dir* *room*) *msg-name*)
 	   =>
 	   (list *msg-text*
@@ -82,12 +101,6 @@
 			 (cons 'user.chat.channel *room*)))
 
 
-(define *msg-sender-2* "bildinto")
-(define *msg-text-2* "he? ĉu vi bonsanas?")
-(define *msg-date-2* *msg-date*)
-(define *msg-name-2* (message-file-leaf *dir* *room* *msg-date-2*))
-
-(channel-message-add! *dir* *room* *msg-text-2* *msg-sender-2* *msg-date-2*)
 (check (directory-file-get* (subpath *dir* *room*) *msg-name-2*)
 	   =>
 	   (list *msg-text-2*
@@ -96,6 +109,35 @@
 			 (cons 'user.chat.channel *room*)))
 
 
+(check (list (find (lambda (a) (string=? *msg-name* a))
+				   (channel-messages *dir* *room*))
+			 (find (lambda (a) (string=? *msg-name-2* a))
+				   (channel-messages *dir* *room*)))
+	   =>
+	   (list *msg-name* *msg-name-2*))
+
+
+(check (list (<= 2 (length (channel-messages-by-sender *dir* *room* "maya")))
+			 (find (lambda (a) (string=? *msg-name-3* a))
+				   (channel-messages-by-sender *dir* *room* "maya")))
+	   =>
+	   (list #t *msg-name-3*))
+
+
+(check (find (lambda (a) (string=? *msg-name-3* a))
+			 (channel-messages-by-date *dir* *room* *msg-date-3*))
+	   =>
+	   *msg-name-3*)
+
+
+(check (let ([messages
+			  (channel-messages-by-date-range *dir* *room* *msg-date-3* *msg-date-4*)])
+		 (list (find (lambda (a) (string=? *msg-name-3* a)) messages)
+			   (find (lambda (a) (string=? *msg-name-4* a)) messages)))
+	   =>
+	   (list *msg-name-3* *msg-name-4*))
+
+
 
 ;; ——————————————————————————————————————————————————
 ;; Channel creation/management