diff --git a/example.exs b/example.exs
index 809866a..25494e2 100755
--- a/example.exs
+++ b/example.exs
@@ -2,11 +2,9 @@
 
 require Elixlsx
 
-alias Elixlsx.Sheet
-alias Elixlsx.Workbook
+alias Elixlsx.{Sheet, Workbook}
 
-sheet1 =
-  Sheet.with_name("First")
+sheet1 = Sheet.with_name("First")
   # Set cell B2 to the string "Hi". :)
   |> Sheet.set_cell("B2", "Hi")
   # Optionally, set font properties:
@@ -21,17 +19,19 @@ sheet1 =
   |> Sheet.set_cell("A3", 1_448_882_362, datetime: true)
   # datetime: true outputs date and time, yyyymmdd limits the output to just the date
   |> Sheet.set_cell("A4", 1_448_882_362, yyyymmdd: true)
+  # datetime: true ouputs date and time, yyyymmdd limits the output to just the date
+  |> Sheet.set_cell("A5", 1_448_882_362, yyyymm: true)
   # make some room in the first column, otherwise the date will only show up as ###
   |> Sheet.set_col_width("A", 18.0)
   # Cell borders
-  |> Sheet.set_cell("A5", "Double border", border: [bottom: [style: :double, color: "#cc3311"]])
+  |> Sheet.set_cell("A6", "Double border", border: [bottom: [style: :double, color: "#cc3311"]])
   # Formatting with empty content
-  |> Sheet.set_cell("A5", :empty,
+  |> Sheet.set_cell("A7", :empty,
     bg_color: "#ffff00",
     border: [bottom: [style: :double, color: "#cc3311"]]
   )
   # Boolean value
-  |> Sheet.set_cell("A6", true)
+  |> Sheet.set_cell("A7", true)
   # Formula
   |> Sheet.set_cell("E1", 1.2, num_format: "0.00")
   |> Sheet.set_cell("E2", 2, num_format: "0.00")
diff --git a/lib/elixlsx/style/num_fmt.ex b/lib/elixlsx/style/num_fmt.ex
index 727eff5..74ae642 100644
--- a/lib/elixlsx/style/num_fmt.ex
+++ b/lib/elixlsx/style/num_fmt.ex
@@ -13,6 +13,9 @@ defmodule Elixlsx.Style.NumFmt do
       props[:yyyymmdd] ->
         date_yyyy_mm_dd()
 
+      props[:yyyymm] ->
+        date_yyyy_mm()
+
       props[:datetime] ->
         date_datetime()
 
@@ -39,6 +42,13 @@ defmodule Elixlsx.Style.NumFmt do
     %NumFmt{format: "yyyy-mm-dd"}
   end
 
+  @doc ~S"""
+  Returns a semi-ISP date format only month and year (YYYY-MM)
+  """
+  def date_yyyy_mm do
+    %NumFmt{format: "yyyy-mm"}
+  end
+
   @doc ~S"""
   Returns a standard semi-iso datetime format.
   """
diff --git a/mix.exs b/mix.exs
index fade930..1ec6181 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,7 +2,7 @@ defmodule Elixlsx.Mixfile do
   use Mix.Project
 
   @source_url "https://github.com/xou/elixlsx"
-  @version "0.5.1"
+  @version "0.5.2"
 
   def project do
     [