diff --git a/be/src/vec/functions/function_timestamp.cpp b/be/src/vec/functions/function_timestamp.cpp
index 8107f247cd12c7..a1aa02adb592d5 100644
--- a/be/src/vec/functions/function_timestamp.cpp
+++ b/be/src/vec/functions/function_timestamp.cpp
@@ -48,6 +48,7 @@
 #include "vec/columns/column_string.h"
 #include "vec/columns/column_vector.h"
 #include "vec/common/assert_cast.h"
+#include "vec/common/int_exp.h"
 #include "vec/common/pod_array_fwd.h"
 #include "vec/common/string_ref.h"
 #include "vec/core/block.h"
@@ -672,11 +673,10 @@ struct UnixTimeStampDateImpl {
                 DCHECK(valid);
 
                 auto [sec, ms] = trim_timestamp(timestamp, NewVersion);
-                auto ms_str = std::to_string(ms).substr(0, scale);
-                if (ms_str.empty()) {
-                    ms_str = "0";
-                }
-                col_result_data[i] = Decimal64::from_int_frac(sec, std::stoll(ms_str), scale).value;
+                col_result_data[i] =
+                        Decimal64::from_int_frac(
+                                sec, ms / static_cast<int64_t>(std::pow(10, 6 - scale)), scale)
+                                .value;
             }
             block.replace_by_position(result, std::move(col_result));
         }
diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/DateTimeExtractAndTransform.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/DateTimeExtractAndTransform.java
index f1387fc810d2b4..2dbf7e0a5da1ec 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/DateTimeExtractAndTransform.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/DateTimeExtractAndTransform.java
@@ -650,7 +650,7 @@ private static String getTimestamp(LocalDateTime dateTime) {
         if (duration.getNano() == 0) {
             return String.valueOf(duration.getSeconds());
         } else {
-            return duration.getSeconds() + "." + (duration.getNano() / 1000);
+            return duration.getSeconds() + "." + String.format("%06d", duration.getNano() / 1000);
         }
     }
 
diff --git a/regression-test/data/nereids_p0/sql_functions/datetime_functions/test_date_function.out b/regression-test/data/nereids_p0/sql_functions/datetime_functions/test_date_function.out
index 6036c185a0d1b3..45afa3602884ed 100644
--- a/regression-test/data/nereids_p0/sql_functions/datetime_functions/test_date_function.out
+++ b/regression-test/data/nereids_p0/sql_functions/datetime_functions/test_date_function.out
@@ -375,6 +375,12 @@ February
 -- !sql_ustamp9 --
 253402185599
 
+-- !sql_ustamp10 --
+1447381219.00001
+
+-- !sql_ustamp11 --
+1447381219.012000
+
 -- !sql --
 0
 
diff --git a/regression-test/suites/nereids_p0/sql_functions/datetime_functions/test_date_function.groovy b/regression-test/suites/nereids_p0/sql_functions/datetime_functions/test_date_function.groovy
index 93f8ff9a6b0272..bf5d5018d7a58a 100644
--- a/regression-test/suites/nereids_p0/sql_functions/datetime_functions/test_date_function.groovy
+++ b/regression-test/suites/nereids_p0/sql_functions/datetime_functions/test_date_function.groovy
@@ -387,8 +387,13 @@ suite("test_date_function") {
     qt_sql_ustamp7 """ select unix_timestamp(cast('2007-11-30 10:30:19.123456' as datetimev2(4))) """
     qt_sql_ustamp8 """ SELECT UNIX_TIMESTAMP('9999-12-30 23:59:59.999'); """
     qt_sql_ustamp9 """ SELECT UNIX_TIMESTAMP('9999-12-30 23:59:59'); """
-    check_fold_consistency("UNIX_TIMESTAMP('9999-12-30 23:59:59.999')")
-    check_fold_consistency("UNIX_TIMESTAMP('9999-12-30 23:59:59')")
+    qt_sql_ustamp10 """ select UNIX_TIMESTAMP('2015-11-13 10:20:19.000010'); """
+    qt_sql_ustamp11 """ select UNIX_TIMESTAMP(cast('2015-11-13 10:20:19.012' as datetime(6))); """
+    check_fold_consistency(" UNIX_TIMESTAMP('9999-12-30 23:59:59.999')")
+    check_fold_consistency(" UNIX_TIMESTAMP('9999-12-30 23:59:59')")
+    check_fold_consistency(" UNIX_TIMESTAMP('2015-11-13 10:20:19.000010')")
+    check_fold_consistency(" UNIX_TIMESTAMP(cast('2015-11-13 10:20:19.000' as datetime(6)))")
+    check_fold_consistency(" UNIX_TIMESTAMP(cast('2015-11-13 10:20:19.012' as datetime(6)))")
     // these two functions may return different value if we call it in different time. so dont use testFoldConst here
     sql "set debug_skip_fold_constant=true;"
     sql "SELECT UNIX_TIMESTAMP(current_timestamp()) AS unix_timestamp;"