diff --git a/.tool-versions b/.tool-versions
index 0a6bd54a3..45cfb3b23 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,3 @@
 erlang 21.1
-elixir 1.11
+elixir 1.10
 nodejs 15.3.0
diff --git a/lib/plausible/stats/query.ex b/lib/plausible/stats/query.ex
index 8645a3d92..35eddd8c2 100644
--- a/lib/plausible/stats/query.ex
+++ b/lib/plausible/stats/query.ex
@@ -9,7 +9,7 @@ defmodule Plausible.Stats.Query do
   def shift_back(%__MODULE__{period: "month"} = query, site) do
     {new_first, new_last} = if Timex.compare(Timex.now(site.timezone), query.date_range.first, :month) == 0  do # Querying current month to date
       diff = Timex.diff(Timex.beginning_of_month(Timex.now(site.timezone)), Timex.now(site.timezone), :days) - 1
-      {query.date_range.first |> Timex.shift(days: diff), Timex.now(site.timezone) |> Timex.shift(days: diff)}
+      {query.date_range.first |> Timex.shift(days: diff), Timex.now(site.timezone) |> Timex.to_date |> Timex.shift(days: diff)}
     else
       diff = Timex.diff(query.date_range.first, query.date_range.last, :days) - 1
       {query.date_range.first |> Timex.shift(days: diff), query.date_range.last |> Timex.shift(days: diff)}