How to convert datetime in Persian in SQL Server

Best method in SQL Server 2016

Example:

SELECT FORMAT(GETDATE(), 'yyyy/MM/dd-HH:mm:ss', 'fa')

Answer:

1398/10/08-05:37:59

I know it is too late for answering this question, but I've submitted the function that I'm using for a long time without any bug, all of other methods which I've ever seen have problem with intercalary years:

CREATE FUNCTION [CalculatePersianDate] ( @intDate DATETIME )
RETURNS NVARCHAR(max)
BEGIN

DECLARE @shYear AS INT ,@shMonth AS INT ,@shDay AS INT ,@intYY AS INT ,@intMM AS INT ,@intDD AS INT ,@Kabiseh1 AS INT ,@Kabiseh2 AS INT ,@d1 AS INT ,@m1 AS INT, @shMaah AS NVARCHAR(max),@shRooz AS NVARCHAR(max),@DayCnt AS INT
DECLARE @DayDate AS NVARCHAR(max)

SET @intYY = DATEPART(yyyy, @intDate)

IF @intYY < 1000 SET @intYY = @intYY + 2000

SET @intMM = MONTH(@intDate)
SET @intDD = DAY(@intDate)
SET @shYear = @intYY - 622
SET @DayCnt = 5

IF ( ( @intYY - 1992 ) % 4 = 0) SET @Kabiseh1 = 0 ELSE SET @Kabiseh1 = 1

IF ( ( @shYear - 1371 ) % 4 = 0) SET @Kabiseh2 = 0 ELSE SET @Kabiseh2 = 1

SET @m1 = 1
SET @d1 = 1
SET @shMonth = 10
SET @shDay = 11

IF ( ( @intYY - 1993 ) % 4 = 0 ) SET @shDay = 12


WHILE ( @m1 != @intMM ) OR ( @d1 != @intDD )
BEGIN

  SET @d1 = @d1 + 1
  SET @DayCnt = @DayCnt + 1

  IF 
  (@d1 = 32 AND (@m1 = 1 OR @m1 = 3 OR @m1 = 5 OR @m1 = 7 OR @m1 = 8 OR @m1 = 10 OR @m1 = 12))
  OR
  (@d1 = 31 AND (@m1 = 4 OR @m1 = 6 OR @m1 = 9 OR @m1 = 11))
  OR
  (@d1 = 30 AND @m1 = 2 AND @Kabiseh1 = 1)
  OR
  (@d1 = 29 AND @m1 = 2 AND @Kabiseh1 = 0)
  BEGIN
    SET @m1 = @m1 + 1
    SET @d1 = 1
  END

  IF @m1 > 12
  BEGIN
    SET @intYY = @intYY + 1
    SET @m1 = 1
  END

  IF @DayCnt > 7 SET @DayCnt = 1

 SET @shDay = @shDay + 1

  IF
  (@shDay = 32 AND @shMonth < 7)
  OR
  (@shDay = 31 AND @shMonth > 6 AND @shMonth < 12)
  OR
  (@shDay = 31 AND @shMonth = 12 AND @Kabiseh2 = 1)
  OR
  (@shDay = 30 AND @shMonth = 12 AND @Kabiseh2 = 0)
  BEGIN
    SET @shMonth = @shMonth + 1
    SET @shDay = 1
  END

  IF @shMonth > 12
  BEGIN
    SET @shYear = @shYear + 1
    SET @shMonth = 1
  END

END

IF @shMonth=1 SET @shMaah=N'فروردین'
IF @shMonth=2 SET @shMaah=N'اردیبهشت'
IF @shMonth=3 SET @shMaah=N'خرداد'
IF @shMonth=4 SET @shMaah=N'تیر'
IF @shMonth=5 SET @shMaah=N'مرداد'
IF @shMonth=6 SET @shMaah=N'شهریور'
IF @shMonth=7 SET @shMaah=N'مهر'
IF @shMonth=8 SET @shMaah=N'آبان'
IF @shMonth=9 SET @shMaah=N'آذر'
IF @shMonth=10 SET @shMaah=N'دی'
IF @shMonth=11 SET @shMaah=N'بهمن'
IF @shMonth=12 SET @shMaah=N'اسفند'

IF @DayCnt=1 SET @shRooz=N'شنبه'
IF @DayCnt=2 SET @shRooz=N'یکشنبه'
IF @DayCnt=3 SET @shRooz=N'دوشنبه'
IF @DayCnt=4 SET @shRooz=N'سه‌شنبه'
IF @DayCnt=5 SET @shRooz=N'چهارشنبه'
IF @DayCnt=6 SET @shRooz=N'پنجشنبه'
IF @DayCnt=7 SET @shRooz=N'جمعه'

--SET @DayDate = @shRooz + " " + LTRIM(STR(@shDay,2)) + " " + @shMaah + " " + STR(@shYear,4)
--پنجشنبه 17 اردیبهشت 1394

/*
SET @DayDate = LTRIM(STR(@shDay,2)) + " " + @shMaah + " " + STR(@shYear,4)
--17 اردیبهشت 1394

SET @DayDate = STR(@shYear,4) + "/"+LTRIM(STR(@shMonth,2)) + "/" + LTRIM(STR(@shDay,2))
--1394/2/17


--1394/02/17
*/
SET @DayDate = REPLACE(RIGHT(STR(@shYear, 4), 4), ' ', '0') + '/'+ REPLACE(STR(@shMonth, 2), ' ', '0') + '/' + REPLACE(( STR(@shDay,2) ), ' ', '0')
RETURN @DayDate
END

It is really easy to customize the result of the function. adopted from: this page

How to convert datetime in Persian in SQL Server

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