From 092703d99668fb06f01c3515abfb0fa27f9e42df Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Mon, 20 Nov 2023 20:45:14 +0000
Subject: Fix [32b88975f7]: clock format returns spurious errors

---
 generic/tclClock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/generic/tclClock.c b/generic/tclClock.c
index 38c4ec0..7d54edd 100644
--- a/generic/tclClock.c
+++ b/generic/tclClock.c
@@ -913,7 +913,7 @@ ConvertLocalToUTCUsingC(
     Tcl_MutexLock(&clockMutex);
     errno = 0;
     fields->seconds = (Tcl_WideInt) mktime(&timeVal);
-    localErrno = errno;
+    localErrno = (fields->seconds == -1) ? errno : 0;
     Tcl_MutexUnlock(&clockMutex);
 
     /*
-- 
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