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C# String was not recognized as a valid DateTime

Error being thrown when the dateString is the following but worked earlier for a different time, not sure why it isn't working now.
string dateString = "Jul 24, 2015 4:03:51 PM PDT";
string format = "MMM dd, yyyy h:mm:ss tt PDT";
CultureInfo provider = CultureInfo.InvariantCulture;
DateTime time = DateTime.ParseExact(dateString, format, provider);
Console.WriteLine(time);
Edited Code: The error is thrown either of the last two lines, sometimes the first DateTime will execute but not the second. The prompt window just asks for, first, the earliest date and time which is: Jul 24, 2015 6:26:15 AM PDT. And then another prompt for the latest DateTime which is: Jul 24, 2015 4:03:51 PM PDT
string afterpromptvalue = Prompt.ShowDialog("Enter earliest Date and Time", "Unshipped Orders");
string beforepromptvalue = Prompt.ShowDialog("Enter latest Date and Time", "Unshipped Orders");
string format = "MMM dd, yyyy h:mm:ss tt PDT";
CultureInfo provider = CultureInfo.InvariantCulture;
DateTime createdAfter = DateTime.ParseExact(afterpromptvalue, format, provider);
DateTime createdBefore = DateTime.ParseExact(beforepromptvalue, format, provider);
Edited again: I wanted to put the prompt dialog box code, because this may be the issue.
public static class Prompt
{
public static string ShowDialog(string text, string caption)
{
Form prompt = new Form();
prompt.Width = 500;
prompt.Height = 150;
prompt.FormBorderStyle = FormBorderStyle.FixedDialog;
prompt.Text = caption;
prompt.StartPosition = FormStartPosition.CenterScreen;
Label textLabel = new Label() { Left = 50, Top=20, Text=text };
TextBox textBox = new TextBox() { Left = 50, Top=50, Width=400 };
Button confirmation = new Button() { Text = "Ok", Left=350, Width=100, Top=70, DialogResult = DialogResult.OK };
confirmation.Click += (sender, e) => { prompt.Close(); };
prompt.Controls.Add(textBox);
prompt.Controls.Add(confirmation);
prompt.Controls.Add(textLabel);
prompt.AcceptButton = confirmation;
return prompt.ShowDialog() == DialogResult.OK ? textBox.Text : "";
}
}

Your code worked at my machine without any error. Try executing it on some other machine or in different solution. If it works means your solution need to be clean and build. If do not work means you you probably missing required references -
using System;
using System.Globalization;

A common error with date parsing is using dd instead of d. With dd, a value of 24 will pass, but 9 will not; the latter would have to be 09 instead. If you use a single d, however, then 9, 09, and 24 would all be allowed.

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

Convert comma separated string to datetime

The Exchange webservice has a method that takes the DateTime in the format below
appointment.Start = new DateTime(2014, 03, 04, 11, 30, 00);
I have a string which is formed by concatenating various fields to form the date my string is as below:
string date="2014,03,04,11,00,00"
But if i try to to parse my string as the date it gives the error "String was not recognized as a valid DateTime".
DateTime.Parse(date)

You can use DateTime.ParseExact:
string date = "2014,03,04,11,00,00";
DateTime dateTime = DateTime.ParseExact(date, "yyyy,MM,dd,HH,mm,ss", CultureInfo.CurrentCulture);

Try this :
string date = "2014,03,04,11,00,00";
DateTime datDate;
if(DateTime.TryParseExact(date, new string[] { "yyyy,MM,dd,hh,mm,ss" },
System.Globalization.CultureInfo.InvariantCulture,
System.Globalization.DateTimeStyles.None, out datDate))
{
Console.WriteLine(datDate);
}

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);
}