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convert string to persian date time

I am developing an asp.net web site, I want to convert a string of Persian date to DateTime type and I used below code but I get Gregorian date
System.Globalization.CultureInfo pr = new System.Globalization.CultureInfo("fa-ir");
DateTime dt = DateTime.ParseExact("1396/04/31", "yyyy/MM/dd", pr);
dt is 7/22/2017 but it must be 1396/04/31
I try this code too but have the same problem
PersianCalendar persianDate = new PersianCalendar();
DateTime st = persianDate.ToDateTime(1396, 04, 31, 0, 0, 0, 0);
I use windows 10 and .net 4.5
how can I resolve this problem.
please help me.

you can use PersianCalendar
System.Globalization.CultureInfo pr = new System.Globalization.CultureInfo("fa-ir");
DateTime dt = DateTime.ParseExact("1396/04/31", "yyyy/MM/dd", pr);
PersianCalendar pc = new PersianCalendar();
Console.WriteLine("Today in the Persian Calendar: {0}, {1}/{2}/{3} {4}:{5}:{6}\n",
pc.GetDayOfWeek(dt),
pc.GetYear(dt),
pc.GetMonth(dt),
pc.GetDayOfMonth(dt),
pc.GetHour(dt),
pc.GetMinute(dt),
pc.GetSecond(dt));

SqlDateTime overflow error when passing DateTime value to SQL database through webservice

Textview has a text with a date (DateTime.Now.LocalTime) that results in this format: 7/4/2016 3:32:40 PM. I tried passing this through DateTime time = Convert.ToDateTime(time.Text); but gives me the SqlDateTime overflow error so I tried changing it into DateTime time = DateTime.ParseExact(txt.Text, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture); but gives me an incorrect format error. What could be the problem?
Here are my codes:
TextView txt = FindViewById<TextView>(Resource.Id.txt);
DateTime time = DateTime.ParseExact(txt.Text, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);
// to pass to webservice
userInfo.TimeStamp = time; // TimeStamp is DateTime type
Relevant codes:
private void DialogBox(object sender, EventArgs eventArgs) // this is for inserting the DateTime value into database
{
EmployeeDetails userInfo = new EmployeeDetails();
DateTime now = DateTime.Now.ToLocalTime();
TextView txt = FindViewById<TextView>(Resource.Id.txt);
if (String.IsNullOrWhiteSpace(request.Text))
{
Android.Support.V7.App.AlertDialog.Builder builder = new Android.Support.V7.App.AlertDialog.Builder(this, Resource.Style.AppCompatAlertDialogStyle);
builder.SetTitle("Warning!");
builder.SetIcon(Resource.Drawable.warning);
builder.SetMessage("Please specify your comment or suggestion.");
builder.SetPositiveButton("OK", (s, ev) => { });
builder.Show();
}
else
{
txt.Text = now.ToString(); // this is for getting the value of passed datetime for next use
userInfo.TimeStamp = now;
_client.InsertToFeedbackTableAsync(userInfo);
}
}
private void ClientOnInsertToFeedbackTableCompleted(object sender, InsertToFeedbackTableCompletedEventArgs ea)
{
EmployeeDetails userInfo = new EmployeeDetails();
TextView txt = FindViewById<TextView>(Resource.Id.txt);
DateTime time = DateTime.ParseExact(txt.Text, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);
string msg = null;
if (ea.Error != null)
{
//blahblah
}
else if (ea.Cancelled)
{
//blahblah
}
else
{
msg = null;
RunOnUiThread(() =>
{
userInfo.TimeStamp = time;
_client.InsertToAnswersTableRequestAsync(userInfo);
});
}
}
private void ClientOnInsertToAnswersTableRequestCompleted(object sender, InsertToAnswersTableRequestCompletedEventArgs ea)
{
EmployeeDetails userInfo = new EmployeeDetails();
TextView txt = FindViewById<TextView>(Resource.Id.txt);
DateTime time = DateTime.ParseExact(txt.Text, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);
string msg = null;
if (ea.Error != null)
{
//blahblah
}
else if (ea.Cancelled)
{
//blahblah
}
else
{ // blahblah}
My code in the webservice:
var fbID = from y in context.Feedbacks where y.timestamp == userInfo.TimeStamp select y.id; // where y.timestamp and userInfo.TimeStamp are DateTime
var fb_ID = fbID.FirstOrDefault();
int returnfbID = Convert.ToInt32(fb_ID);

Since your datetime values such as 7/4/2016 3:32:40 PM can contain single digits, not necessarily 2 digits all times, you should use the format string "M/d/yyyy h:m:s tt" to DateTime.ParseExact.

How convert Gregorian date to Persian date?

I want to convert a custom Gregorian date to Persian date in C#.
For example, i have a string with this contents:
string GregorianDate = "Thursday, October 24, 2013";
Now i want to have:
string PersianDate = پنج‌شنبه 2 آبان 1392 ;
or
string PersianDate = 1392/08/02
Thanks

Use the PersianCalendar:
string GregorianDate = "Thursday, October 24, 2013";
DateTime d = DateTime.Parse(GregorianDate);
PersianCalendar pc = new PersianCalendar();
Console.WriteLine(string.Format("{0}/{1}/{2}", pc.GetYear(d), pc.GetMonth(d), pc.GetDayOfMonth(d)));

DateTime date = new DateTime(2013, 10, 24);
var calendar = new PersianCalendar();
var persianDate = new DateTime(calendar.GetYear(date), calendar.GetMonth(date), calendar.GetDayOfMonth(date));
var result = persianDate.ToString("yyyy MMM ddd", CultureInfo.GetCultureInfo("fa-Ir"));

You can use PersianDateTime:
PM> Install-Package PersianDateTime
The Reference: PersianDateTime
You can use string.Split() if you need customization.

Adding up to other answers, You can get the first one by using PersianDateTime:
var gregorianDate = "Thursday, October 24, 2013";
var date = DateTime.Parse(gregorianDate);
var persianDate = new PersianDateTime(date);
var result = persianDate.ToString("dddd d MMMM yyyy");

The fowlling code should work in .net 4+ :
DateTime date=Convert.ToDateTime("2020-07-12T19:30:00.000Z");
string persianDateString = date.ToString("yyyy/MM/dd",new CultureInfo("fa-IR"));
persianDateString value would be:
1399/04/23

In windows 10, using framework 4+:
Console.WriteLine(Convert.ToDateTime("1392/08/02",new CultureInfo("fa-IR")));
or
Console.WriteLine(DateTime.Parse("1392/08/02", new CultureInfo("fa-IR")));

You can convert a DateTime to Iran time using this method:
DateTime timeInIran = TimeZoneInfo.ConvertTimeBySystemTimeZoneId(DateTimeToConvert, "Iran Standard Time" );

Convert string to DateTime Format - wrong format

I really cannot make sense of why this does not want to work. I get an exception:
String was not recognized as a valid DateTime.
I am reading the string date from a file and looks like this 2/27/2014 10:10:55
This method receives the filename and extrapolates the data I need (latitude, longitude, date)
public void ReadCsvFile(string filename)
{
var reader = new StreamReader(File.OpenRead(filename));
gpsDataList = new List<GpsFileClass>();
while(!reader.EndOfStream){
var line = reader.ReadLine();
var values = line.Split(',');
if(values[2].Contains("A")){
values[2] = values[2].Substring(0,values[2].IndexOf("A"));
values[2].Replace("\"", "");
values[2] = values[2].Trim();
}
if(values[2].Contains("P")){
values[2] = values[2].Substring(0, values[2].IndexOf("P"));
values[2].Replace("\"", "");
values[2] = values[2].Trim();
}
gpsDataList.Add(new GpsFileClass(Convert.ToDouble(values[0]), Convert.ToDouble(values[1]), Convert.ToString(values[2])));
}
}
Once the I have the file data in a List<> I want to do some date comparisons and calculations. But first; I try to convert the string data containing date information to datetime like this:
public void SaveFrameGpsCoordinate()
{
int listSize = gpsDataList.Count;
DateTimeFormatInfo dateTimeFormatInfo = new DateTimeFormatInfo();
dateTimeFormatInfo.ShortDatePattern = "dd-MM-yyyy HH:mm:ss";
dateTimeFormatInfo.DateSeparator = "/";
//DateTime tempDateA = DateTime.ParseExact(gpsDataList[0].timeCaptured, "dd/MM/yyyy HH:mm:ss",null);
//DateTime tempDateB = DateTime.ParseExact(gpsDataList[lastRecordData].timeCaptured, "dd/MM/yyyy HH:mm:ss", null);
DateTime tempDateA = Convert.ToDateTime(gpsDataList[0].timeCaptured.Replace("\"", ""), System.Globalization.CultureInfo.GetCultureInfo("hi-IN").DateTimeFormat);
DateTime tempDateB = Convert.ToDateTime(gpsDataList[lastRecordData].timeCaptured.Replace("\"", ""), System.Globalization.CultureInfo.GetCultureInfo("hi-IN").DateTimeFormat);
}
As you can see even ParseExact throws the same exception, I tried it (hence commented it out).
There are a lot solutions for this kind of problem but non seem to work on mine. I get that DateTime by default uses en-US calture. But When I even when I change the culture to "af-ZA" I get the same exception.
Please help.

I don't believe it; The variable that holds the size of the List<> was going out of range (check line 3 of code below) but for some reason it did not throw an "out of range exception".
public void SaveFrameGpsCoordinate()
{
int listSize = gpsDataList.Count - 1;
DateTimeFormatInfo dateTimeFormatInfo = new DateTimeFormatInfo();
dateTimeFormatInfo.ShortDatePattern = "dd-MM-yyyy HH:mm:ss";
dateTimeFormatInfo.DateSeparator = "/";
//DateTime tempDateA = DateTime.ParseExact(gpsDataList[0].timeCaptured, "dd/MM/yyyy HH:mm:ss",null);
//DateTime tempDateB = DateTime.ParseExact(gpsDataList[lastRecordData].timeCaptured, "dd/MM/yyyy HH:mm:ss", null);
DateTime tempDateA = Convert.ToDateTime(gpsDataList[0].timeCaptured.Replace("\"", ""), System.Globalization.CultureInfo.GetCultureInfo("hi-IN").DateTimeFormat);
DateTime tempDateB = Convert.ToDateTime(gpsDataList[lastRecordData].timeCaptured.Replace("\"", ""), System.Globalization.CultureInfo.GetCultureInfo("hi-IN").DateTimeFormat);
}

You can use the ParseExact method
var dateTime = DateTime.ParseExact("2/27/2014 10:10:55",
"M/d/yyyy h:m:s", CultureInfo.InvariantCulture);

'dd' expects a 2 digit date. You probably want to use 'd' instead.
Similarly 'MM' expects a 2 digit month - again you probably want to use 'M' instead.
Source: http://msdn.microsoft.com/en-us/library/8kb3ddd4(v=vs.110).aspx

Date format from Dutch to English

I have a date in string format (i.e in Dutch language), like "7 juli 2013". I want to convert it in English format. "Convert.toDateTime(strValue) throw exception as that converts only English format. I also try this
string strValue = "7 juli 2013";
CultureInfo ci = new CultureInfo("en-US");
strValue = strValue.ToString(ci);
but this is not working. What is the way to convert it?

string strValue = "7 juli 2013";
// Convert to DateTime
CultureInfo dutch = new CultureInfo("nl-NL", false);
DateTime dt = DateTime.Parse(strValue, dutch);
// Convert the DateTime to a string
CultureInfo ci = new CultureInfo("en-US", false);
strValue = dt.ToString("d MMM yyyy", ci);
You first convert the string to a DateTime, then .ToString the DateTime!
And, in general, it's false that Convert.ToDateTime uses only English. The overload you used uses the current culture of your pc (so on my pc it uses italian), and there is the Convert.ToDateTime(string, IFormatProvider) overload that accepts a CultureInfo.
Multilanguage... But note that this is wrong! You can't be sure that a word doesn't have different meaning in different places!!!
// The languages you want to recognize
var languages = new[] { "nl-NL", "it-IT" };
DateTime dt = DateTime.MinValue;
bool success = false;
foreach (var lang in languages)
{
if (DateTime.TryParse(strValue, new CultureInfo(lang, false), DateTimeStyles.AssumeLocal, out dt))
{
success = true;
break;
}
}
if (success)
{
CultureInfo ci = new CultureInfo("en-US", false);
strValue = dt.ToString("d MMM yyyy", ci);
}