diff --git a/documentation20/en/12.taos-sql/docs.md b/documentation20/en/12.taos-sql/docs.md
index 2b2f5a6725d8e1cd92341df64b7e47bc032dac4a..99a440162bee617de2def652f56e3c5f02090fb7 100755
--- a/documentation20/en/12.taos-sql/docs.md
+++ b/documentation20/en/12.taos-sql/docs.md
@@ -1569,7 +1569,7 @@ Starting from version 2.6.0.0, TDengine supports following time related function
 
     Example:
     ```mysql
-    taos> SELECT TODAY() FROM meters;
+    taos> SELECT TIMEZONE() FROM meters;
                timezone()           |
     =================================
      UTC (UTC, +0000)               |
@@ -1638,7 +1638,7 @@ Starting from version 2.6.0.0, TDengine supports following time related function
 
  - **TIMETRUNCATE**
     ```mysql
-    SELECT TIMEDIFF(ts_val | datetime_string | ts_col, time_unit) FROM { tb_name | stb_name } [WHERE clause];
+    SELECT TIMETRUNCATE(ts_val | datetime_string | ts_col, time_unit) FROM { tb_name | stb_name } [WHERE clause];
     ```
     Function: Truncate timestamp by time_unit.