diff --git a/test/test_utils.py b/test/test_utils.py
index cd0b08a..f42da21 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -47,3 +47,16 @@ async def test_convert_browser_context_cookies_uses_url_filter():
     browser_context.cookies.assert_awaited_once_with(urls=["https://www.douyin.com"])
     assert cookie_str == "sessionid=abc"
     assert cookie_dict == {"sessionid": "abc"}
+
+
+def test_rfc2822_to_timestamp_converts_utc_offset():
+    # 2023-12-23 17:12:54 +0800 == 2023-12-23 09:12:54 UTC == 1703322774
+    assert utils.rfc2822_to_timestamp("Sat Dec 23 17:12:54 +0800 2023") == 1703322774
+
+
+def test_rfc2822_to_timestamp_agrees_with_china_datetime():
+    rfc2822_time = "Sat Dec 23 17:12:54 +0800 2023"
+
+    assert utils.rfc2822_to_timestamp(rfc2822_time) == int(
+        utils.rfc2822_to_china_datetime(rfc2822_time).timestamp()
+    )
diff --git a/tools/time_util.py b/tools/time_util.py
index 5777bae..d157f98 100644
--- a/tools/time_util.py
+++ b/tools/time_util.py
@@ -118,7 +118,7 @@ def rfc2822_to_timestamp(rfc2822_time):
     dt_object = datetime.strptime(rfc2822_time, rfc2822_format)
 
     # Convert datetime object to UTC time
-    dt_utc = dt_object.replace(tzinfo=timezone.utc)
+    dt_utc = dt_object.astimezone(timezone.utc)
 
     # Calculate Unix timestamp from UTC time
     timestamp = int(dt_utc.timestamp())