SQL Server – Generate Calendar using TSQL

Introduction

Recently, I was asked to develop a SSRS based report for the Event Management module in MS Dynamics CRM 2011. The idea was to show a Calendar for the selected month and each cell of the calendar should display the scheduled events of that day.

Showing the events in the required format in each cell was not a big issue. The main challenge was to generate a dynamic grid of Calendar. Luckily, the CRM was deployed on-premises and I got a chance to use TSQL to generate the Calendar.

Implementation

Below is the TSQL which I came up with to generate the Calendar -

DECLARE @Month AS INT = 4 --Set the MONTH for which you want to generate the Calendar.

DECLARE @Year AS INT = 2013 --Set the YEAR for which you want to generate the Calendar.

--Find and set the Start & End Date of the said Month-Year

DECLARE @StartDate AS DATETIME = CONVERT(VARCHAR,@Year) + RIGHT('0' + CONVERT(VARCHAR,@Month),2) + '01'

DECLARE @EndDate AS DATETIME = DATEADD(DAY,-1,DATEADD(MONTH,1,@StartDate))

;WITH Dates AS (

  SELECT 

    @StartDate Dt

  UNION ALL

  SELECT 

    DATEADD(DAY,1,Dt) 

  FROM 

    Dates 

  WHERE 

    DATEADD(DAY,1,Dt) <= @EndDate

),Details AS (

  SELECT 

    DAY(Dt) CDay,

    DATEPART(WK,Dt) CWeek,

    MONTH(Dt) CMonth,

    YEAR(Dt) CYear,

    DATENAME(WEEKDAY,Dt) DOW,

    Dt 

  FROM 

    Dates

)

--Selecting the Final Calendar

SELECT

  Sunday,

  Monday,

  Tuesday,

  Wednesday,

  Thursday,

  Friday,

  Saturday

FROM

  (SELECT CWeek,DOW,CDay FROM Details) D

PIVOT

(

  MIN(CDay)

  FOR DOW IN (Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday)

) AS PVT

ORDER BY

  CWeek

Output:

Hope, this will help!