diff --git a/lib/cocktail/schedule_state.ex b/lib/cocktail/schedule_state.ex
index 8d60398..09f6ea4 100644
--- a/lib/cocktail/schedule_state.ex
+++ b/lib/cocktail/schedule_state.ex
@@ -37,7 +37,8 @@ defmodule Cocktail.ScheduleState do
     %__MODULE__{
       recurrence_rules: schedule.recurrence_rules |> Enum.map(&RuleState.new/1),
       recurrence_times: recurrence_times_after_current_time,
-      exception_times: schedule.exception_times |> Enum.uniq() |> Enum.sort(&(Cocktail.Time.compare(&1, &2) in [:lt, :eq])),
+      exception_times:
+        schedule.exception_times |> Enum.uniq() |> Enum.sort(&(Cocktail.Time.compare(&1, &2) in [:lt, :eq])),
       start_time: schedule.start_time,
       current_time: current_time,
       duration: schedule.duration
diff --git a/lib/cocktail/time.ex b/lib/cocktail/time.ex
index f95a57a..44866d5 100644
--- a/lib/cocktail/time.ex
+++ b/lib/cocktail/time.ex
@@ -77,7 +77,6 @@ defmodule Cocktail.Time do
     end
   end
 
-
   defp new_coerced_datetime(year, month, day, hour, minute, second, microsecond, timezone) do
     days_in_month_b = :calendar.last_day_of_the_month(year, month)
 
@@ -340,6 +339,6 @@ defmodule Cocktail.Time do
   def parse(_, _), do: {:error, :invalid_format}
 
   defp get_time_zone_datebase do
-    Application.get_env(:elixir, :time_zone_database, Tzdata.TimeZoneDatabase)
+    Application.get_env(:elixir, :time_zone_database)
   end
 end
diff --git a/mix.exs b/mix.exs
index 87ae72e..8551fa3 100644
--- a/mix.exs
+++ b/mix.exs
@@ -81,7 +81,7 @@ defmodule Cocktail.Mixfile do
       {:dialyxir, "~> 1.0", only: [:dev, :test], runtime: false},
       {:ex_doc, "~> 0.23", only: :dev, runtime: false},
       {:excoveralls, "~> 0.10", only: :test},
-      {:tzdata, "~> 1.1"}
+      {:tzdata, "~> 1.1", only: :test}
     ]
   end
 end
diff --git a/test/cocktail/monthly_test.exs b/test/cocktail/monthly_test.exs
index f0f7b00..7d5824a 100644
--- a/test/cocktail/monthly_test.exs
+++ b/test/cocktail/monthly_test.exs
@@ -138,13 +138,13 @@ defmodule Cocktail.MonthlyTest do
       |> Schedule.add_recurrence_rule(:monthly, interval: 3)
 
     assert first_n_occurrences(schedule, 7) == [
-             ~U[2017-01-02 06:00:00Z],
-             ~U[2017-03-02 06:00:00Z],
-             ~U[2017-04-02 06:00:00Z],
-             ~U[2017-05-02 06:00:00Z],
-             ~U[2017-07-02 06:00:00Z],
-             ~U[2017-09-02 06:00:00Z],
-             ~U[2017-10-02 06:00:00Z]
+             ~Y[2017-01-02 06:00:00 Etc/UTC],
+             ~Y[2017-03-02 06:00:00 Etc/UTC],
+             ~Y[2017-04-02 06:00:00 Etc/UTC],
+             ~Y[2017-05-02 06:00:00 Etc/UTC],
+             ~Y[2017-07-02 06:00:00 Etc/UTC],
+             ~Y[2017-09-02 06:00:00 Etc/UTC],
+             ~Y[2017-10-02 06:00:00 Etc/UTC]
            ]
 
     assert_icalendar_preserved(schedule)
diff --git a/test/test_helper.exs b/test/test_helper.exs
index 580d1cc..18ff609 100644
--- a/test/test_helper.exs
+++ b/test/test_helper.exs
@@ -1,4 +1,4 @@
 ExUnit.configure(exclude: [pending: true], formatters: [ExUnit.CLIFormatter, ExUnitNotifier])
 ExUnit.start()
-
+Application.put_env(:elixir, :time_zone_database, Tzdata.TimeZoneDatabase)
 Code.require_file("test/support/datetime_sigil.ex")