diff --git a/time_api.py b/time_api.py
new file mode 100644
index 0000000..8251916
--- /dev/null
+++ b/time_api.py
@@ -0,0 +1,23 @@
+from datetime import datetime, timedelta, timezone
+import time
+
+def to_utc_time(query_time: str):
+    '''
+    将一个北京时间的时间点，转换成utc
+    '''
+    beijing_time = datetime.fromisoformat(query_time)
+    utc_time = beijing_time.astimezone(timezone.utc)
+    return utc_time
+    
+def to_utc_time_range(query_time: str, delta: float):
+    '''
+    将一个北京时间的时间点，转换成utc的 start/end 时间段
+    有些查询按照一个时间点查不到，用时间段保证能成功
+    '''
+    beijing_time = datetime.fromisoformat(query_time)
+    utc_time = beijing_time.astimezone(timezone.utc)
+    
+    utc_start_time = utc_time - timedelta(seconds=delta)
+    utc_end_time = utc_time + timedelta(seconds=delta)
+
+    return (utc_start_time, utc_end_time)
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