diff --git a/aosstower/level_00/parser.py b/aosstower/level_00/parser.py
index d30fcef7e2adaf229ef2ed56175431c5c60ca833..b5413ad360b867a6e2ae97e621c31f579d8ec202 100644
--- a/aosstower/level_00/parser.py
+++ b/aosstower/level_00/parser.py
@@ -45,7 +45,7 @@ import time
 import logging
 from datetime import datetime, timedelta
 
-from metobscommon.data.data_time import hhmm_to_offset
+from metobscommon.util.mytime import hhmm_to_offset
 from aosstower.schema import database
 
 LOG = logging.getLogger(__name__)
diff --git a/aosstower/level_00/rrd.py b/aosstower/level_00/rrd.py
index 2c70f5e0b9546b3f3088c5280a0b9d34ee7bb8ff..084911197b85d28d29d7570b10a78a699a8dbe29 100644
--- a/aosstower/level_00/rrd.py
+++ b/aosstower/level_00/rrd.py
@@ -7,7 +7,7 @@ from datetime import datetime, timedelta
 import rrdtool
 
 from metobscommon.data.calc import altimeter, dewpoint, wind_vector_components
-from metobscommon.data.data_time import to_unix_timestamp
+from metobscommon.util.mytime import to_epoch
 from aosstower import station
 
 
@@ -42,7 +42,7 @@ def initialize_rrd(filepath, start=None, days=365, data_interval=5):
     assert not os.path.exists(filepath), "DB already exists"
     start = start or (datetime.utcnow() - timedelta(days=days))
     # normalize start to data interval
-    secs = to_unix_timestamp(start)
+    secs = to_epoch(start)
     secs -= secs % data_interval
 
     rrdtool.create(filepath,