How to convert a Persian date into a Gregorian date?

Question

I use the function below to convert Gregorian dates to Persian dates, but I\'ve been unable to write a function to do the reverse conversion. I want a function that converts

Answer 1

1- first install Persiandate NuGet package (17KB)

Install-Package PersianDate

2- use ToFa and toEn static methods of PersianDate class like(do not worry about the seperators and directions which will be handled by library itself as you can see in the following samples .also you can find the Usage Console project inside in GitHub to test it yourself easily):

   //default format 
    string dts=ConvertDate.ToFa(DateTime.Now);//1393/08/01
    //date only (short and D for Long)
    dts=ConvertDate.ToFa(DateTime.Now, "d");//93/08/01 
    dts=ConvertDate.ToFa(DateTime.Now, "D");//پنج شنبه, 01 آبان 1393
    //time only 
    dts=ConvertDate.ToFa(DateTime.Now, "t");//21:53 
    dts=ConvertDate.ToFa(DateTime.Now, "T");//21:53:26
    //general short date + time
    dts=ConvertDate.ToFa(DateTime.Now, "g");//93/08/01 21:53 
    dts=ConvertDate.ToFa(DateTime.Now, "G");//93/08/01 21:53:26
    //general full date + time
    dts=ConvertDate.ToFa(DateTime.Now, "f");//پنج شنبه, 01 آبان 1393 21:53 
    dts=ConvertDate.ToFa(DateTime.Now, "F");//پنج شنبه, 01 آبان 1393 21:53:26
    //only month and year
    dts=ConvertDate.ToFa(DateTime.Now, "m");//آبان 1 
    dts=ConvertDate.ToFa(DateTime.Now, "y");//1393 آبان

    dts=ConvertDate.ToFa(DateTime.Now);//1393/08/01
    // converting back to Gregorian date 
    Datetime dt= ConvertDate.ToEn(dts);//2014/10/23 00:00:00

3- Source code available in GitHub for any modifications and supporting new formats.

look for the following functions source code to see how it is generally working

    public static DateTime ToEn(string fadate)
    {
        if (fadate.Trim() == "") return DateTime.MinValue;
        int[] farsiPartArray = SplitRoozMahSalNew(fadate);

        return new PersianCalendar().ToDateTime(farsiPartArray[0], farsiPartArray[1], farsiPartArray[2], 0, 0, 0, 0);

    }

    private static int[] SplitRoozMahSalNew(string farsiDate)
    {
        int pYear = 0;
        int pMonth = 0;
        int pDay = 0;


        //normalize with one character
        farsiDate = farsiDate.Trim().Replace(@"\", "/").Replace(@"-", "/").Replace(@"_", "/").
            Replace(@",", "/").Replace(@".", "/").Replace(@" ", "/");


        string[] rawValues = farsiDate.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries);


        if (!farsiDate.Contains("/"))
        {
            if (rawValues.Length != 2)
                throw new Exception("usually there should be 2 seperator for a complete date");
        }
        else //mostly given in all numeric format like 13930316
        {
            // detect year side and add slashes in right places and continue
        }
        //new simple method which emcompass below methods too
        try
        {
            pYear = int.Parse(rawValues[0].TrimStart(new[] { '0' }).Trim());
            pMonth = int.Parse(rawValues[1].TrimStart(new[] { '0' }).Trim());
            pDay = int.Parse(rawValues[2].TrimStart(new[] { '0' }).Trim());

            // the year usually must be larger than 90
            //or for historic values rarely lower than 33 if 2 digit is given
            if (pYear < 33 && pYear > 0)
            {
                //swap year and day
                pYear = pDay;
                pDay = int.Parse(rawValues[0]); //convert again
            }
            //fix 2 digits of persian strings
            if (pYear.ToString(CultureInfo.InvariantCulture).Length == 2)
                pYear = pYear + 1300;
            //
            if (pMonth <= 0 || pMonth >= 13)
                throw new Exception("mahe shamsi must be under 12 ");
        }
        catch (Exception ex)
        {
            throw new Exception(
                "invalid Persian date format: maybe all 3 numric Sal, Mah,rooz parts are not present. \r\n" + ex);
        }

        return new[] { pYear, pMonth, pDay };
    }

Answer 2

This method converts a string which represents a shamsi date to System.DateTime :

    public DateTime milady(string shamsiDate)
    {
        DateTime dt = new DateTime();
        PersianCalendar pc = new PersianCalendar();

        int pYear = Convert.ToInt32(shamsiDate.Substring(0, 4));
        int pMonth =Convert.ToInt32(shamsiDate.Substring(5, 2));
        int pDay =  Convert.ToInt32( shamsiDate.Substring(8));


        dt = pc.ToDateTime(pYear, pMonth, pDay,0,0,0,0);
        return dt;
    }

Answer 3

You can use PersianDateTime, using Nuget:

PM> Install-Package PersianDateTime

and how you can use:

DateTime miladiDate = new DateTime(2013, 5, 31);
PersianDateTime persianDate = new PersianDateTime(miladiDate);

and:

PersianDateTime persianDate = PersianDateTime.Parse("1392/03/02");
DateTime miladiDate = persianDate.ToDateTime(); 

for : more info about PersianDateTime