diff --git a/responseCacher/cache.py b/responseCacher/cache.py
index a004cc0..79e871f 100644
--- a/responseCacher/cache.py
+++ b/responseCacher/cache.py
@@ -16,6 +16,7 @@
 import requests
 
 from obspy import read_inventory
+from obspy.core import UTCDateTime
 from config import config
 
 if __name__ == "__main__":
@@ -73,6 +74,11 @@
         else:
             segment_length = 3600
 
+        t0 = starttime
+        t1 = endtime
+        starttime = (UTCDateTime(starttime)+1.0).isoformat()
+        endtime = (UTCDateTime(endtime)-1.0).isoformat()
+
         # Prepare to read inventory using ObsPy
         requestOptions = (
             config["API_URL"],
@@ -88,6 +94,9 @@
         except:
             continue
 
+        starttime = t0
+        endtime = t1
+
         # Verify that only one channel is returned
         contents = inventory.get_contents()
         if len(contents["networks"]) != 1 or len(contents["stations"]) != 1 or len(contents["channels"]) != 1:
@@ -96,6 +105,7 @@
         # Get the first response object
         response = inventory[0][0][0].response
 
+
         # Call evalresp to evaluate the response
         # NFFT must be same as in Welch's method!
         # We use 13 segments with 75% overlap