Declare @MyDate JalaliDate = '1392/02/11 21:38:24'
Select @MyDate.ToString() as MyDateTime
           , @MyDate.GetDate() as MyDate
           , @MyDate.GetTime() as MyTime
           , @MyDate.Year as MyYear
           , @MyDate.Month as MyMonth
          , @MyDate.Day as MyDay
          , @MyDate.Hour as MyHour
          , @MyDate.Minute as MyMinute
          , @MyDate.Second as MySecond
          , @MyDate.JalaliDateAdd('Year',1) as NextYear
          , @MyDate.JalaliDateAdd('Month',1) as NextMonth
          , @MyDate.JalaliDateAdd('Day',1) as NextDay
          , @MyDate.JalaliDateAdd('Hour',1) as NextHour
          , @MyDate.JalaliDateAdd('Minute',1) as NextMinute
          , @MyDate.JalaliDateAdd('Second',1) as NextSecond

using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;

public partial class UserDefinedFunctions
{
    [Microsoft.SqlServer.Server.SqlFunction]
    public static JalaliDate GetCurrentDateTime()
    {
        System.Globalization.PersianCalendar pers = new System.Globalization.PersianCalendar();
        DateTime CurrentDate = DateTime.Now;
        JalaliDate jl;
        jl.Year = (Int16)pers.GetYear(CurrentDate);
        jl.Month = (byte)pers.GetMonth(CurrentDate);
        jl.Day = (byte)pers.GetDayOfMonth(CurrentDate);
        jl.Hour = (byte)pers.GetHour(CurrentDate);
        jl.Minute = (byte)pers.GetMinute(CurrentDate);
        jl.Second = (byte)pers.GetSecond(CurrentDate);
        return jl;
    }
}

Declare @MyDate JalaliDate = dbo.GetCurrentDateTime()

Select dbo.GetCurrentDateTime().ToString()