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-rw-r--r--module/srfi/srfi-19/alt/util.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/module/srfi/srfi-19/alt/util.scm b/module/srfi/srfi-19/alt/util.scm
index 8de92d93..38c1c146 100644
--- a/module/srfi/srfi-19/alt/util.scm
+++ b/module/srfi/srfi-19/alt/util.scm
@@ -108,6 +108,7 @@
((#\H) (format #t "~2'0d" (hour time)))
((#\M) (format #t "~2'0d" (minute time)))
((#\S) (format #t "~2'0d" (second time)))
+ ((#\z) (when (utc? time) (display "Z")))
(else (unless allow-unknown?
(error 'time->string "Invalid format token ~a" token))))
#f)