diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 7000c470ed..cb70d36219 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -328,9 +328,9 @@ (define-syntax-rule (unless-file-not-found exp)
           #f
           (apply throw args)))))
 
-(define (seconds->string seconds)
-  "Return a string representing the date for SECONDS."
-  (let ((time (make-time time-utc 0 seconds)))
+(define (epoch->date-string epoch)
+  "Return a string representing the date for EPOCH seconds."
+  (let ((time (make-time time-utc 0 epoch)))
     (date->string (time-utc->date time)
                   "~Y-~m-~d ~H:~M")))
 
@@ -348,7 +348,7 @@ (define (system->boot-parameters system number time)
          (inherit params)
          (label (string-append label " (#"
                                (number->string number) ", "
-                               (seconds->string time) ")"))))))
+                               (epoch->date-string time) ")"))))))
   (let* ((systems (map (cut generation-file-name profile <>)
                        numbers))
          (times   (map (lambda (system)