[TD-11220]<feature>(query): time related functions

src/common/src/texpr.c

@@ -1189,8 +1189,7 @@ int32_t exprValidateTimeNode(tExprNode *pExpr) {
         return TSDB_CODE_TSC_OUT_OF_MEMORY;
       }
       child->pVal->nType = TSDB_DATA_TYPE_TIMESTAMP;
-      child->pVal->i64   = taosGetTimestampMs();
-
+      child->pVal->i64   = taosGetTimestampToday() * 1000;
       pExpr->resultType  = TSDB_DATA_TYPE_TIMESTAMP;
       pExpr->resultBytes = (int16_t)tDataTypes[pExpr->resultType].bytes;
       break;