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Shamsi Convertor

, 11 Jan 2006
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Convert Hijri Shamsi Date to Gregorian and Gregorian to Hijri Shamsi
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Introduction

One of the main iranian programmers is converting Date of conputer to Hijri Shamsi Date. The Hijri date have to kind. First Hijri Shamsi that it dates is related to Sun and the second one is hijri Ghamari that related to moon. the Hijri Shamsi is one of the most exact calendars in the world and it's made by Khayyam (iranian astrologer).

but as you know computer calendar work with gregorian calendar and any other kind of calendars need to convert from gregorian. this article try to convert Gregorian date to Hijri Shamsi and Hijri Shamsi date to Gregorian.

The main must we know for this converting is the diffrence of this calndars is 621 years. but one main problem is leap years in both calendars.

In Hijri Shamsi calendar the years that the remainder of their devide to 33 be one of 1, 5, 9, 13, 17, 22, 26, 30 this numbers is leap year.

And in Gregorian we the date class of .NET can calculate for us the gregorian year.
example:

Date.IsLeapYear(2005)

this function return a bool value.

Calculating Shamsi Date

Time Line of years

The point number 1 in picture show the start date of Shamsi Year

The point number 2 show Gregorian start date

the point number 3 show finish date of Shamsi year

The point number 4 show finish date of Gregorian year

First we devision 621 years from Gregorian year.

Year = GregorianDate.Year - 621

at this point we will be some where between point number 2 and 4. If we were after number 3 it means the diffrence year is 621 years but if we were before point number 3 the diffrence of years will be 622 years.

For finding this:

<BR>If ShamsiIsLeap(Year - 1) = True And Date.IsLeapYear(GregorianDate.Year) Then<BR>    ToEid = 80 'To Eid is diffrence between point number 2 and 3<BR>Else<BR>    ToEid = 79<BR>End If

If the passed days of Gregorian date were fewer than ToEid it means diffrence of years is 622 Years

       If GregorianDate.DayOfYear <= ToEid Then<BR>            Year -= 1 'Diffrence is 622 Years<BR>            Elapsed = 286 + GregorianDate.DayOfYear<BR>            If ShamsiIsLeap(Year) And Not Date.IsLeapYear(GregorianDate.Year) Then<BR>                Elapsed += 1<BR>            End If<BR>        Else<BR>            Elapsed = GregorianDate.DayOfYear - ToEid<BR>        End If

Elapsed is passed days of Shamsi year. and finally we convert passed days to Shamsi Date

DayOfYearToShamsi(Elapsed)
For converting Shamsi date to Gregorian we do this:
Private Sub ToGregorian()<BR>        Dim Y As Integer<BR>        Y = Year + 621<BR>        Dim DOY As Integer = DayOfYear()<BR>        Dim ToEid As Integer<BR>        Dim YearDays As Integer<BR>        If ShamsiIsLeap(Year - 1) And Date.IsLeapYear(Y) Then<BR>            ToEid = 80<BR>            YearDays = 366<BR>        Else<BR>            ToEid = 79<BR>            YearDays = 365<BR>        End If<BR>        Dim GDays As Integer = ToEid + DOY<BR>        If GDays > YearDays Then<BR>            GDays -= YearDays<BR>            Y += 1<BR>        End If<BR>        DayOfYearToGregorian(GDays, Y)<BR>End Sub<BR>

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About the Author

Hamed J.I
Web Developer
Iran (Islamic Republic Of) Iran (Islamic Republic Of)
I began programming with C/C++ when i was 15. Then try to learn VC++ but at the middle of my reading .NET came.
 
I began to read C# and VB.NET and also began designing basic websites by FrontPage and developed some websites for our school and some other companis.
 
Later learn Microcontroller and design some digital circuits with PIC microcontrollers for a industrial controller company.
 
As I learned SQL and ASP.NET developed some website such as news portals that are active now.
 
Now i'm a software student and teach programming in computer institues. And have my own job by getting projects from companies.

Comments and Discussions

 
Generalmain form missing PinmemberMarwan11111-Jun-11 14:45 
GeneralCode Not Works Pinmembereg_Anubhava26-Oct-09 0:38 
GeneralIt works wrong PinmemberAlexQII30-Jan-09 1:26 
QuestionC# shamsi PinmemberMaryam_F28-Jul-06 22:34 
Generalshamsi Pinmembershereen20063-Apr-06 3:48 
GeneralRe: shamsi PinmemberHamed_ji3-Apr-06 5:41 
GeneralCan't Download this code Pinmembera_mohammadi_m12-Mar-06 19:37 
GeneralRe: Can't Download this code PinmemberHamed_ji17-Mar-06 6:45 
GeneralShamsi date in sql server PinmemberHossein Hayatbakhsh14-Feb-06 0:53 
GeneralRe: Shamsi date in sql server PinmemberHamed_ji14-Feb-06 22:40 
GeneralPersia .NET API PinmemberMajid Shahabfar11-Jan-06 9:41 
General.Net 2 and accuracy of algorithms PinmemberHomam8511-Jan-06 6:42 
GeneralRe: .Net 2 and accuracy of algorithms PinmemberHamed_ji12-Jan-06 9:16 
GeneralRe: .Net 2 and accuracy of algorithms PinmemberHojjats13-Jan-06 10:15 
GeneralRe: .Net 2 and accuracy of algorithms PinmemberHamed_ji14-Jan-06 21:17 

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