Add direct *gtime.Time handling in Time converter

Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>

os/gtime/gtime_z_unit_timezone_issue_test.go

@@ -0,0 +1,61 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package gtime_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/gogf/gf/v2/os/gtime"
+	"github.com/gogf/gf/v2/test/gtest"
+	"github.com/gogf/gf/v2/util/gconv"
+)
+
+// Test for issue #4429: gtime timezone preservation during struct conversion
+func TestTime_Issue4429_TimezonePreservation(t1 *testing.T) {
+	gtest.C(t1, func(t *gtest.T) {
+		// Set local timezone to simulate the issue environment
+		originalLocation := time.Local
+		defer func() {
+			time.Local = originalLocation
+		}()
+		
+		shanghaiLocation, _ := time.LoadLocation("Asia/Shanghai")
+		time.Local = shanghaiLocation
+
+		// Create a time with GMT timezone (like database result)
+		gmtLocation, _ := time.LoadLocation("GMT")
+		dbTime := time.Date(2025, 9, 15, 7, 45, 40, 0, gmtLocation)
+		gtimeVal := gtime.NewFromTime(dbTime)
+
+		// Simulate ORM Result.Structs() conversion
+		result := []map[string]interface{}{{"now": gtimeVal}}
+		var nowResult []time.Time
+		err := gconv.Structs(result, &nowResult)
+		t.AssertNil(err)
+		
+		convertedTime := nowResult[0]
+		
+		// The key assertion: timezone offset should be preserved
+		originalName, originalOffset := gtimeVal.Zone()
+		convertedName, convertedOffset := convertedTime.Zone()
+		
+		// Offset must be preserved (this is the critical fix)
+		t.Assert(originalOffset, convertedOffset)
+		
+		// Times should represent the same instant
+		t.Assert(gtimeVal.Time.Equal(convertedTime), true)
+		
+		// Both should have 0 offset (GMT/UTC)
+		t.Assert(originalOffset, 0)
+		t.Assert(convertedOffset, 0)
+		
+		// Note: Timezone name might change (GMT->UTC) but that's acceptable as long as offset is preserved
+		_ = originalName
+		_ = convertedName
+	})
+}

util/gconv/internal/converter/converter_time.go

@@ -22,6 +22,10 @@ func (c *Converter) Time(anyInput any, format ...string) (time.Time, error) {
 		if v, ok := anyInput.(time.Time); ok {
 			return v, nil
 		}
+		// Handle *gtime.Time directly to preserve timezone
+		if v, ok := anyInput.(*gtime.Time); ok {
+			return v.Time, nil
+		}
 	}
 	t, err := c.GTime(anyInput, format...)
 	if err != nil {