diff --git a/README.md b/README.md
index 8da3bb1..8c4d170 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ simple micro service for converting your RRD's to web services
 ### examples
 - last 24 hours ```curl 127.0.0.1:9000/?rrd_path=tests/port-id15.rrd```
 - epoch date time filter ```curl 127.0.0.1:9000/?rrd_path=tests/port-id15.rrd&epoch_start_time=1622109000&epoch_end_time=1624787400```
+- epoch date filter with daily step ```curl 127.0.0.1:9000/?rrd_path=tests/port-id15.rrd&epoch_start_time=1630425600&epoch_end_time=1633017600&step=86400```
 
 ### rrdtool
 - tested with version 1.7
diff --git a/backend/RRD_parse.py b/backend/RRD_parse.py
index bc0827e..9f497f0 100644
--- a/backend/RRD_parse.py
+++ b/backend/RRD_parse.py
@@ -9,10 +9,10 @@
 
 class RRD_parser:
 
-    def __init__(self, rrd_file=None, start_time=None, end_time=None):
+    def __init__(self, rrd_file=None, start_time=None, end_time=None, step=None):
         self.rrd_file = rrd_file
         self.ds = None
-        self.step = None
+        self.step = step
         self.time_format = "%Y-%m-%d %H:%M:%S"
         self.check_dependc()
         self.start_time = start_time
@@ -53,7 +53,8 @@ def get_data_source(self):
                     ds_val = match_obj.group(1)
                     if ds_val not in DS_VALS:
                         DS_VALS.append(ds_val)
-        self.step = STEP_VAL
+
+        self.step = STEP_VAL if self.step is None else self.step
         self.ds = DS_VALS
 
     def get_rrd_json(self, ds):
@@ -61,7 +62,7 @@ def get_rrd_json(self, ds):
         
         rrd_xport_command = f"rrdtool xport --step {self.step} DEF:data={self.rrd_file}:{ds}:AVERAGE XPORT:data:{ds} --showtime"
         if self.start_time:
-            rrd_xport_command = f"rrdtool xport DEF:data={self.rrd_file}:{ds}:AVERAGE XPORT:data:{ds} --showtime --start {self.start_time} --end {self.end_time}"
+            rrd_xport_command = f"rrdtool xport DEF:data={self.rrd_file}:{ds}:AVERAGE XPORT:data:{ds} --showtime --start {self.start_time} --end {self.end_time} --step {self.step}"
         result = subprocess.check_output(
                                         rrd_xport_command,
                                         shell=True
diff --git a/rrdrest.py b/rrdrest.py
index 1d7f6e7..373d5f0 100644
--- a/rrdrest.py
+++ b/rrdrest.py
@@ -16,7 +16,12 @@
     "/",
     summary="Get the data from a RRD file, takes in a rrd file path"
     )
-async def get_rrd(rrd_path: str, epoch_start_time: Optional[int] = None, epoch_end_time: Optional[int] = None):
+async def get_rrd(
+                  rrd_path: str,
+                  epoch_start_time: Optional[int] = None,
+                  epoch_end_time: Optional[int] = None,
+                  step: Optional[int] = None
+                  ):
     is_file = os.path.isfile(rrd_path)
     if is_file:
         if (epoch_start_time and not epoch_end_time) or (epoch_end_time and not epoch_start_time):
@@ -25,7 +30,8 @@ async def get_rrd(rrd_path: str, epoch_start_time: Optional[int] = None, epoch_e
             rr = RRD_parser(
                             rrd_file=rrd_path,
                             start_time=epoch_start_time,
-                            end_time=epoch_end_time
+                            end_time=epoch_end_time,
+                            step=step
                             )
             r = rr.compile_result()
             return r