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C# How to seperate string character by character [closed]

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I have parsed a response from an Api into date string, and its data. The date string shows as:
"201710010900000"
What i am trying to to do is convert this into a format that can be read by date mm/dd/yyyy to do this
i must grab the first 4 letters as year, the next 2 as month, the next 2 as day. ideally call these into separate strings date,month,day. that way it can be converted into one string.
string reDate = (month + "/" + day + "/" + year);
Is there a way to call each character of the string individually, Or what would be the best way to do this?

A string is an array of characters. Just iterate over it or use an indexer, eg:
var someChar="201710010900000"[0];
You don't need to do that if you want to parse this as a date though, as you should. Just use DateTime.ParseExact, eg:
var input="201710010900000";
var format="yyyyMMddHHmmssf";
var date=DateTime.ParseExact(input,format,CultureInfo.InvariantCulture);
Other overloads allow you to specify multiple formats, eg this one.
ParseExact will throw an exception if the conversion fails. If you expect this to be a common occurence, you can use TryParseExact :
var styles=DateTimeStyles.None;
var culture=CultureInfo.InvariantCulture;
if (DateTime.TryParseExact(input,format,culture,styles,out var date))
{
//Do something with the date
}
Once you have the DateTime value you can use the standard string formatting mechanisms to generate a string with the format you want, in the culture you want.
If you want a US-style short date, you can write any of the following :
var targetCulture = CultureInfo.GetCultureInfo("en-US");
var text1=date.ToString("d",targetCulture);
var text2=String.Format(targetCulture,"This is my date: {0:d}",result);

DateTime.ParseExact or DateTime.TryParseExact were made for this purpose:
DateTime dt;
bool validDate = DateTime.TryParseExact("201710010900000", "yyyyMMddHHmmssf", null, DateTimeStyles.None, out dt);
To separate the day, month etc you just need to use the available properties:
int year = dt.Year;
int month = dt.Month;
int day = dt.Day;
int hour = dt.Hour;
If you want the return string with this format: month+"/"+ day+"/"+year use DateTime.ToString:
string returnString = dt.ToString("MM/dd/yyyy", CultureInfo.InvariantCulture);

ParseExact into DateTime and then represent it as a String:
string source = "201710010900000";
string result = DateTime
.ParseExact(source, "yyyyMMddHHmmssf", CultureInfo.InvariantCulture)
.ToString("MM'/'dd'/'yyyy");

If your plan is to 'iterate' over the response you can try something like:
var input = "201710010900000";
var year = Convert.ToInt32(input.Substring(0, 4));
var month = Convert.ToInt32(input.Substring(4, 2));
var day = Convert.ToInt32(input.Substring(6, 2));
var hour = Convert.ToInt32(input.Substring(8, 2));
var minutes = Convert.ToInt32(input.Substring(10, 2));
var seconds = Convert.ToInt32(input.Substring(12, 2));
var date = new DateTime(year, month, day, hour, minutes, seconds);
Console.WriteLine(date);
I hope it helps,
Another aproach is to create a new date specifying the imput format as somebody else answered here (and to be fair a very good aproach).
Juan

Formatting datetime variable [closed]

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I am trying to convert and store a date in the form of String into datetime variable.
String fromdate= "02-JUN-2014";
DateTime dFromDate = Convert.ToDateTime(fromdate);
This dfromDate is used in another function which expects date to be in 02-JUN-2014 format.But since dfromDate storing the date as 06/02/2014, there is a format exception.

You can use ParseExact()
String fromdate="02-JUN-2014";
DateTime dFromDate = DateTime.ParseExact(fromdate, "dd-MMM-yyyy",CultureInfo.InvariantCulture)

Wrap fromDate in quotes:
var fromdate = "02-JUN-2014";
var dFromDate = Convert.ToDateTime(fromdate);

I am not to sure of the entire context but you could always use the folowing to create a new date:
DateTime thisDate1 = new DateTime(2011, 6, 10);
Console.WriteLine("Today is " + thisDate1.ToString("MMMM dd, yyyy") + ".");
// The example displays the following output:
// Today is June 10, 2011.

You want to use DateTime.ParseExact i.e.
DateTime dFromDate = DateTime.ParseExact(fromdate, "dd-MMM-yyyy", CultureInfo.InvariantCulture);
You may need to specific a culture for your language if you are not US (CultureInfo.InvariantCulture is a special form of US).

Convert.ToDateTime uses standard date and time format of your CurrentCulture and looks like dd-MMM-yyyy is not one of them.
You can use ParseExact method with english-based culture like InvariantCulture.
String fromdate = "02-JUN-2014";
DateTime dFromDate = DateTime.ParseExact(fromdate, "dd-MMM-yyyy",
CultureInfo.InvariantCulture);

Using DateTime.ParseExactmight work, and itis the best option if you know exactly the format string, but you could also set the current CultureInfo for the call:
String fromdate= "02-JUN-2014";
DateTime dFromDate = Convert.ToDateTime(fromdate, CultureInfo.CurrentCulture);
Or:
String fromdate= "02-JUN-2014";
DateTime dFromDate = Convert.ToDateTime(fromdate, new CultureInfo("es-ES"));

String fromdate= "02-JUN-2014";
DateTime dFromDate = DateTime.ParseExact(fromdate,"dd-MMM-yyyy",
CultureInfo.InvariantCulture);
Use ParseExact method.

Your first problem might be, that you need to assign a string like this:
String fromdate = "02-JUN-2014";

Create Datetime object with specific date format [closed]

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How can I create instance of DateTime with specific date format ?
I would like to get DateTime with date format like: "yyyy-MM-dd".
Is is possible to get this instance like
var myDate = DateTime.Now.ToDateFormat("yyyy-MM-dd");
I must have DateTime object not a string.

DateTime is a class to store date and time information, it can be represented as string in very many ways (use .ToString(format) to specify the format required); if you want to change its default string reprsentation (i.e. default format, in order not to put ToString(format) everywhere within your code):
CultureInfo culture = new CultureInfo(Thread.CurrentThread.CurrentCulture.Name, true);
culture.DateTimeFormat.ShortDatePattern = "yyyy-MM-dd";
culture.DateTimeFormat.LongTimePattern = "HH:mm:ss";
Thread.CurrentThread.CurrentCulture = culture;
...
// 2016-05-25 14:26:46
// since "yyyy-MM-dd" + "HH:mm:ss" is a default format now
Console.Write(DateTime.Now);
so whenever DateTime should be represented as string (usually input/output operations) the format will be "yyyy-MM-dd HH:mm:ss"

I cant comment yet, so i have to do it this way.
See DateTime as an object with the properties "Month", "Day" and "Week". Until you print it, there is no date format.
Are you having issues between the javascript and C# date format (and/or model binding)?

Not exactly sure what the question is. I think Stephen provided an answer. DateTime does not have a format. But if not then I guess it's one of the following:
1) How to parse string into a DateTime?
// s is string containing date
DateTime s2d=DateTime.ParseExact(s, "yyyy-MM-dd", CultureInfo.InvariantCulture);
2) How to get date only component, with time 00:00:00.00000
DateTime dateOnly=myDate.Date;
DateTime dateOnlyNow=DateTime.Today; // For today's date.

Try this :
string fromFormat = "dd/MM/yyyy HH:mm:ss";
string toFormat = "yyyy-MM-dd HH:mm:ss";
string mydate = DateTime.Now.ToString();
DateTime newDate = DateTime.ParseExact(mydate, fromFormat, null);
String dat = newDate.ToString(toFormat);

DateTime objects can be created in different ways, e.g.:
DateTime myDate0 = DateTime.Now;
DateTime myDate1 = new DateTime(2016, 5, 25);
DateTime myDate2 = new DateTime(2016, 5, 25, 16, 45, 59, 985);
DateTime myDate3 = DateTime.ParseExact("2016-05-25", "yyyy-MM-dd", CultureInfo.InvariantCulture);
Date information is variable and can be changed in different ways, e.g.:
myDate0 = myDate0.Subtract(new TimeSpan(12, 0, 0));
myDate1 = myDate1.AddYears(15);
myDate2 = myDate2.Add(new TimeSpan(31, 7, 45, 59));
myDate3 = myDate3.AddDays(31);
myDate3 = myDate3.AddHours(7);
DateTime object can be represented as string in different ways, as written here by Dmitry Bychenko and Beldi Anouar too e.g.:
string string0 = myDate0.ToString("yyyy-MM-dd");
string string1 = myDate1.ToShortDateString();

How to find number of days from two string type dates? [closed]

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I have two text box dates (8/11/2014) and (9/11/2014). I want to find the number of days between these two dates. I am getting some string error message. Please help me..

Just parse both dates and then substract them and count total days like this:
DateTime date1 = DateTime.ParseExact(dateString1, "d/M/yyyy", CultureInfo.InvariantCulture);
DateTime date2 = DateTime.ParseExact(dateString2, "d/M/yyyy", CultureInfo.InvariantCulture);
var days = (int)(date2-date1).TotalDays;

I feel taking risk to answer this but..
You can use DateTime.ParseExact or DateTime.TryParseExact methods to parse your strings and subtract each other and use TimeSpan.TotalDays property. You can use TimeSpan.Days property as well if you are interested in the total days as an int rather than a double.
string txtdate = "8/11/2014";
DateTime dt;
if(DateTime.TryParseExact(txtdate, "d/MM/yyyy",
CultureInfo.InvariantCulture,
DateTimeStyles.None, out dt))
{
}
string txtdate1 = "9/11/2014";
DateTime dt1;
if(DateTime.TryParseExact(txtdate1, "d/MM/yyyy",
CultureInfo.InvariantCulture,
DateTimeStyles.None, out dt1))
{
}
var totaldays = (dt1 - dt).Days; // 1
You said;
I need output as 8/11/2014-9/11/2014=1. But I applied your code it
shows output like 1.0?
I told you TotalDays property returns double and Days property returns int. But besides that, you seems like a result as 9/11/2014 - 8/11/2014 = 1 instead of just 1. In such a case, you can use string.Format like;
var result = string.Format("{0} - {1} = {2}",
dt1.ToString("d/MM/yyyy", CultureInfo.InvariantCulture),
dt.ToString("d/MM/yyyy", CultureInfo.InvariantCulture),
totaldays);
result will be 9/11/2014 - 8/11/2014 = 1

String not valid as a datetime string - Convert "yyyyMMdd" to datetime [closed]

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I have strings in format of "yyyyMMdd".
I would like to convert them into DateTime with the format but I get an error that says the string is not valid as a DateTime string.
How can I do this?

Use DateTime.ParseExact to specify the format and invariant culture:
var date = DateTime.ParseExact(date, "yyyyMMdd", CultureInfo.InvariantCulture);

Try DateTime.TryParseExact
DateTime dt;
DateTime.TryParseExact(textBox.Text, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None, out dt);

Use DateTime.ParseExact:
string dateString = "20130701";
DateTime dt = DateTime.ParseExact(dateString, "yyyyMMdd", null, DateTimeStyles.None);

This question has been asked and answered before. But here is an example of working code:
string DateString = "20130701";
DateTime DT = DateTime.ParseExact(DateString, "yyyyMMdd", CultureInfo.InvariantCulture);
Where CultureInfo.InvariantCulture is a part of the System.Globalization namespace.
http://msdn.microsoft.com/en-us/library/system.globalization.cultureinfo(v=vs.71).aspx

Break them into a format which DateTime.Parse will accept as valid. You could even use a regular expression to parse out the information
Regex format = new Regex("(?<year>^[0-9]{4})(?<month>[0-9]{2})(?<day>[0-9]{2})");
Match m = format.Match(inputString);
int year = int.Parse(m.Groups["year"].Value;
int month = int.Parse(m.Groups["month"].Value;
int day = int.Parse(m.Groups["day"].Value;
DateTime date = new DateTime(year, month, day);