diff --git a/src/modules/http/inc/httpJson.h b/src/modules/http/inc/httpJson.h
index 91c39a1ac2..403c20b083 100644
--- a/src/modules/http/inc/httpJson.h
+++ b/src/modules/http/inc/httpJson.h
@@ -63,8 +63,8 @@ void httpJsonString(JsonBuf* buf, char* sVal, int len);
 void httpJsonOriginString(JsonBuf* buf, char* sVal, int len);
 void httpJsonStringForTransMean(JsonBuf* buf, char* SVal, int maxLen);
 void httpJsonInt64(JsonBuf* buf, int64_t num);
-void httpJsonTimestamp(JsonBuf* buf, int64_t t);
-void httpJsonUtcTimestamp(JsonBuf* buf, int64_t t);
+void httpJsonTimestamp(JsonBuf* buf, int64_t t, bool us);
+void httpJsonUtcTimestamp(JsonBuf* buf, int64_t t, bool us);
 void httpJsonInt(JsonBuf* buf, int num);
 void httpJsonFloat(JsonBuf* buf, float num);
 void httpJsonDouble(JsonBuf* buf, double num);
diff --git a/src/modules/http/inc/restJson.h b/src/modules/http/inc/restJson.h
index e16c148d7c..7cff21d190 100644
--- a/src/modules/http/inc/restJson.h
+++ b/src/modules/http/inc/restJson.h
@@ -40,8 +40,8 @@
 #define REST_JSON_AFFECT_ROWS_LEN 13
 
 #define REST_TIMESTAMP_FMT_LOCAL_STRING 0
-#define REST_TIMESTAMP_FMT_TIMESTAMP 1
-#define REST_TIMESTAMP_FMT_UTC_STRING 2
+#define REST_TIMESTAMP_FMT_TIMESTAMP    1
+#define REST_TIMESTAMP_FMT_UTC_STRING   2
 
 void restBuildSqlAffectRowsJson(HttpContext *pContext, HttpSqlCmd *cmd, int affect_rows);
 
diff --git a/src/modules/http/src/httpJson.c b/src/modules/http/src/httpJson.c
index 189d6c8f30..26e539bfdb 100644
--- a/src/modules/http/src/httpJson.c
+++ b/src/modules/http/src/httpJson.c
@@ -260,30 +260,45 @@ void httpJsonInt64(JsonBuf* buf, int64_t num) {
   buf->lst += snprintf(buf->lst, MAX_NUM_STR_SZ, "%ld", num);
 }
 
-void httpJsonTimestamp(JsonBuf* buf, int64_t t) {
-  char ts[30] = {0};
+void httpJsonTimestamp(JsonBuf* buf, int64_t t, bool us) {
+  char ts[35] = {0};
+  struct tm *ptm;
+  int precision = 1000;
+  if (us) {
+    precision = 1000000;
+  }
 
-  struct tm* ptm;
-  time_t     tt = t / 1000;
+  time_t tt = t / precision;
   ptm = localtime(&tt);
-  int length = (int)strftime(ts, 30, "%Y-%m-%d %H:%M:%S", ptm);
+  int length = (int) strftime(ts, 35, "%Y-%m-%d %H:%M:%S", ptm);
+  if (us) {
+    length += snprintf(ts + length, 8, ".%06ld", t % precision);
+  } else {
+    length += snprintf(ts + length, 5, ".%03ld", t % precision);
+  }
 
-  snprintf(ts+length, MAX_NUM_STR_SZ, ".%03ld", t % 1000);
-
-  httpJsonString(buf, ts, length + 4);
+  httpJsonString(buf, ts, length);
 }
 
-void httpJsonUtcTimestamp(JsonBuf* buf, int64_t t) {
-  char ts[35] = {0};
-
+void httpJsonUtcTimestamp(JsonBuf* buf, int64_t t, bool us) {
+  char ts[40] = {0};
   struct tm *ptm;
-  time_t tt = t / 1000;
-  ptm = localtime(&tt);
-  int length = (int) strftime(ts, 35, "%Y-%m-%dT%H:%M:%S", ptm);
-  length += snprintf(ts + length, MAX_NUM_STR_SZ, ".%03ld", t % 1000);
-  length += (int) strftime(ts + length, 35 - length, "%z", ptm);
+  int precision = 1000;
+  if (us) {
+    precision = 1000000;
+  }
 
-  httpJsonString(buf, ts, length + 4);
+  time_t tt = t / precision;
+  ptm = localtime(&tt);
+  int length = (int) strftime(ts, 40, "%Y-%m-%dT%H:%M:%S", ptm);
+  if (us) {
+    length += snprintf(ts + length, 8, ".%06ld", t % precision);
+  } else {
+    length += snprintf(ts + length, 5, ".%03ld", t % precision);
+  }
+  length += (int) strftime(ts + length, 40 - length, "%z", ptm);
+
+  httpJsonString(buf, ts, length);
 }
 
 void httpJsonInt(JsonBuf* buf, int num) {
diff --git a/src/modules/http/src/restJson.c b/src/modules/http/src/restJson.c
index e9315fa32b..8aa0ac5069 100644
--- a/src/modules/http/src/restJson.c
+++ b/src/modules/http/src/restJson.c
@@ -135,11 +135,11 @@ bool restBuildSqlJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result,
           break;
         case TSDB_DATA_TYPE_TIMESTAMP:
           if (timestampFormat == REST_TIMESTAMP_FMT_LOCAL_STRING) {
-            httpJsonTimestamp(jsonBuf, *((int64_t *)row[i]));
+            httpJsonTimestamp(jsonBuf, *((int64_t *)row[i]), taos_result_precision(result) == TSDB_TIME_PRECISION_MICRO);
           } else if (timestampFormat == REST_TIMESTAMP_FMT_TIMESTAMP) {
             httpJsonInt64(jsonBuf, *((int64_t *)row[i]));
           } else {
-            httpJsonUtcTimestamp(jsonBuf, *((int64_t *)row[i]));
+            httpJsonUtcTimestamp(jsonBuf, *((int64_t *)row[i]), taos_result_precision(result) == TSDB_TIME_PRECISION_MICRO);
           }
           break;
         default: