From 01ff8fcca02666da4a2888e1d5ea3b3ff80dd9bc Mon Sep 17 00:00:00 2001
From: Peleus <245629560@qq.com>
Date: Mon, 5 Feb 2024 12:00:22 +0800
Subject: [PATCH] optimize `ToW3cString` method

---
 outputer.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/outputer.go b/outputer.go
index 62f51d34..99960794 100644
--- a/outputer.go
+++ b/outputer.go
@@ -476,7 +476,13 @@ func (c Carbon) ToRssString(timezone ...string) string {
 // ToW3cString outputs a string in "2006-01-02T15:04:05Z07:00" layout.
 // 输出 "2006-01-02T15:04:05Z07:00" 格式字符串
 func (c Carbon) ToW3cString(timezone ...string) string {
-	return c.ToRfc3339String(timezone...)
+	if len(timezone) > 0 {
+		c.loc, c.Error = getLocationByTimezone(timezone[0])
+	}
+	if c.IsInvalid() {
+		return ""
+	}
+	return c.StdTime().Format(W3cLayout)
 }
 
 // ToUnixDateString outputs a string in "Mon Jan _2 15:04:05 MST 2006" layout.