From faf48da321a02cb5057eb77acc501fbe1f88bf0f Mon Sep 17 00:00:00 2001
From: Weixie Cui <cuiweixie@gmail.com>
Date: Sat, 4 Jul 2026 20:52:34 +0800
Subject: [PATCH] accounts/keystore: include minutes in toISO8601 timezone
 offset
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The timezone suffix only encoded hours, producing incorrect filenames
in zones with non-zero minute offsets (e.g. UTC+05:30 → "+0530" not
"+00500"). Format both hours and minutes separately.
---
 accounts/keystore/key.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/accounts/keystore/key.go b/accounts/keystore/key.go
index 34712cb842..a87915c2d1 100644
--- a/accounts/keystore/key.go
+++ b/accounts/keystore/key.go
@@ -230,7 +230,12 @@ func toISO8601(t time.Time) string {
 	if name == "UTC" {
 		tz = "Z"
 	} else {
-		tz = fmt.Sprintf("%+03d00", offset/3600)
+		hours := offset / 3600
+		minutes := (offset % 3600) / 60
+		if minutes < 0 {
+			minutes = -minutes
+		}
+		tz = fmt.Sprintf("%+03d%02d", hours, minutes)
 	}
 	return fmt.Sprintf("%04d-%02d-%02dT%02d-%02d-%02d.%09d%s",
 		t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), tz)