Convert string Persian date to Gregorian DateTime

Question

To convert a string Persian date to gregorian DateTime, I use date time picker and it sends me a string like "۱۳۹۴/۰۲/۲۰"

PersianCalendar p = new PersianCalendar();               
string[] d = start.Split('/');           
DateTime dt = new DateTime(int.Parse(d[0]), 
                           int.Parse(d[1]),
                           int.Parse(d[2]),
                           new HijriCalendar());

and my function that converts is

public static DateTime ToGregorianDate(this DateTime dt)
{
     PersianCalendar pc = new PersianCalendar();
     return pc.ToDateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, 0, 0);    
}

It gives DateTime how can I send correct DateTime when it wants to convert shows this error:

Input string was not in a correct format.

Answer 1

You have two different problems:

• Arabic digits aren't supported by DateTime parsing

• PersianCalendar isn't part of any CultureInfo, so you can't use it directly while parsing the string to DateTime (and you can't set it to a preexisting CultureInfo).

Possible solution:

string date = "۱۳۹۴/۰۲/۲۰";
string date2 = Regex.Replace(date, "[۰-۹]", x => ((char)(x.Value[0] - '۰' + '0')).ToString());

Replace the digits from Arabic to decimal

DateTime dt = DateTime.ParseExact(date2, "yyyy/MM/dd", CultureInfo.InvariantCulture);

Then parse the date ignoring the calendar

PersianCalendar pc = new PersianCalendar();
DateTime dt2 = pc.ToDateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, dt.Second, dt.Millisecond);

Then convert the date to the right calendar.

This solution is broken because Persian Calendar months have a different number of days than Gregorian months