diff --git a/tests/test_time.robot b/tests/test_time.robot
index 02144fe..728ce83 100644
--- a/tests/test_time.robot
+++ b/tests/test_time.robot
@@ -418,9 +418,12 @@
     [Documentation]  Convert epoch time to date format.
     [Arguments]  ${epoch_time}
     # Description of argument(s):
-    # epoch_time  epoch time in miliseconds.
+    # epoch_time  epoch time in milliseconds.
     #             (e.g. 1487304700000000)
 
+    # Convert epoch_time into floating point number.
+    ${epoch_time}=  Convert To Number  ${epoch_time}
+
     # Convert epoch time from microseconds to seconds
     ${epoch_time_sec}=  Evaluate  ${epoch_time}/1000000