diff --git a/lib/reports_kit.rb b/lib/reports_kit.rb
index a04c4c0..faec52f 100644
--- a/lib/reports_kit.rb
+++ b/lib/reports_kit.rb
@@ -21,6 +21,7 @@
 
 require 'reports_kit/reports/adapters/mysql'
 require 'reports_kit/reports/adapters/postgresql'
+require 'reports_kit/reports/adapters/mssql'
 
 require 'reports_kit/reports/data/add_table_aggregations'
 require 'reports_kit/reports/data/aggregate_composite'
diff --git a/lib/reports_kit/reports/adapters/mssql.rb b/lib/reports_kit/reports/adapters/mssql.rb
new file mode 100644
index 0000000..ae9b229
--- /dev/null
+++ b/lib/reports_kit/reports/adapters/mssql.rb
@@ -0,0 +1,26 @@
+module ReportsKit
+  module Reports
+    module Adapters
+      class Mssql
+        def self.truncate_to_day(column)
+          "CONVERT(date,#{column})"
+        end
+
+        def self.truncate_to_week(column)
+          case ReportsKit.configuration.first_day_of_week
+          when :sunday
+            "DATEADD(day, 1 - DATEPART(weekday,#{column}), CONVERT(date,#{column}))"
+          when :monday
+            "DATEADD(day,  - (DATEPART(weekday,#{column}) + 5 ) %  7, CONVERT(date,#{column}))"
+          else
+            raise ArgumentError.new("Unsupported first_day_of_week: #{ReportsKit.configuration.first_day_of_week}")
+          end
+        end
+
+        def self.truncate_to_month(column)
+          "DATEADD(day, 1 - DATEPART(day,#{column}),  CONVERT(date,#{column}))"
+        end
+      end
+    end
+  end
+end
diff --git a/lib/reports_kit/reports/dimension_with_series.rb b/lib/reports_kit/reports/dimension_with_series.rb
index 4c87003..f27b3aa 100644
--- a/lib/reports_kit/reports/dimension_with_series.rb
+++ b/lib/reports_kit/reports/dimension_with_series.rb
@@ -5,7 +5,8 @@ class DimensionWithSeries
       VALID_GRANULARITIES = %w(day week month).freeze
       ADAPTER_NAMES_CLASSES = {
         'mysql2' => Adapters::Mysql,
-        'postgresql' => Adapters::Postgresql
+        'postgresql' => Adapters::Postgresql,
+        'sqlserver' => Adapters::Mssql
       }.freeze
 
       attr_accessor :dimension, :series, :configuration