hi iam creating a hotel reservation form and wanted to calculate total cost of stay by the nights stayed. it requires an arrival date and departure date but i want to add a validation so if the user inputs an incorrect format a message box displays asking them to try again. here is my code already had a bit of help with converting the timespan so once again any help would be amazing. the error is on the line that begins "dateDiff = aDate" and it says the variables aDate and dDate are unassigned thanks in advance:
String arrival, departure;
arrival = textBox1.Text;
departure = textBox2.Text;
DateTime aDate, dDate;
try
{
aDate = DateTime.ParseExact(arrival, "dd/mm/yyyy", null);
dDate = DateTime.ParseExact(departure, "dd/mm/yyyy", null);
return;
}
catch
{
MessageBox.Show("Invalid input format please enter in format DD/MM/YYYY");
}
TimeSpan dateDiff;
dateDiff = dDate.Subtract(aDate);
int nights = (int)dateDiff.TotalDays;
textBox3.Text = ("" + nights);
textBox5.Text = ("£" + (nights * 115));
The reason for the compiler warning is that you haven't assigned a value to your local DateTime fields. Local variables are not initialized with a default value, hence you must do it manually before you can use them. Since you assign the value in a Try/Catch it's not ensured that they will ever get one.
Instead you could use DateTime.TryParseExact:
DateTime aDate, dDate;
if( DateTime.TryParseExact(arrival, "dd/mm/yyyy", null, DateTimeStyles.None, out aDate)
&& DateTime.TryParseExact(departure, "dd/mm/yyyy", null, DateTimeStyles.None, out dDate))
{
// ...
}
else{
MessageBox.Show("Invalid input format please enter in format DD/MM/YYYY");
}
Your code it continuing after your catch. Place the code using the dates within your try-block.
String arrival, departure;
arrival = textBox1.Text;
departure = textBox2.Text;
DateTime aDate, dDate;
try
{
aDate = DateTime.ParseExact(arrival, "dd/mm/yyyy", null);
dDate = DateTime.ParseExact(departure, "dd/mm/yyyy", null);
TimeSpan dateDiff;
dateDiff = dDate.Subtract(aDate);
int nights = (int)dateDiff.TotalDays;
textBox3.Text = ("" + nights);
textBox5.Text = ("£" + (nights * 115));
}
catch
{
MessageBox.Show("Invalid input format please enter in format DD/MM/YYYY");
}
And don't return if they parse successfully, or you'll have no result when your input does validate.
Alternatively, place the return in your catch-block, so that execution is stopped on failure.
Your code should be
String arrival, departure;
arrival = textBox1.Text;
departure = textBox2.Text;
DateTime aDate, dDate;
try
{
aDate = DateTime.ParseExact(arrival, "dd/mm/yyyy", null);
dDate = DateTime.ParseExact(departure, "dd/mm/yyyy", null);
TimeSpan dateDiff;
dateDiff = dDate.Subtract(aDate);
int nights = (int)dateDiff.TotalDays;
textBox3.Text = ("" + nights);
textBox5.Text = ("£" + (nights * 115));
}
catch
{
MessageBox.Show("Invalid input format please enter in format DD/MM/YYYY");
return;
}
Use dateTimePicker control you don't need to Parse
Assign some default values to your aDate, dDate, and the error will go away. The reason is that compiler can't determine if they will be assigned values for sure in the try block. You can do
DateTime aDate = default(DateTime);
DateTime dDate = default(DateTime);
BUT
instead of using try-catch to validate date, its better if you use DateTime.TryParseExact
DateTime aDate, dDate;
if (DateTime.TryParseExact(arrival,
"dd/MM/yyyy",
CultureInfo.InvariantCulture,
DateTimeStyles.NoCurrentDateDefault,
out aDate))
{
MessageBox.Show("Invalid input format please enter in format DD/MM/YYYY");
}
So your complete code should be:
String arrival, departure;
arrival = textBox1.Text;
departure = textBox2.Text;
DateTime aDate, dDate;
if (DateTime.TryParseExact(arrival,
"dd/MM/yyyy",
CultureInfo.InvariantCulture,
DateTimeStyles.NoCurrentDateDefault,
out aDate))
{
MessageBox.Show("Invalid input format for Arrival Date - please enter in format DD/MM/YYYY");
}
if (DateTime.TryParseExact(departure,
"dd/MM/yyyy",
CultureInfo.InvariantCulture,
DateTimeStyles.NoCurrentDateDefault,
out dDate))
{
MessageBox.Show("Invalid input format for Departure Date - please enter in format DD/MM/YYYY");
}
TimeSpan dateDiff;
dateDiff = dDate.Subtract(aDate);
int nights = (int)dateDiff.TotalDays;
textBox3.Text = ("" + nights);
textBox5.Text = ("£" + (nights * 115));
Related
I have date in format 2017-08-24 22:22:45. How to extract only 2017-08-24?
I tried to use:
var data = date.Split('-');
string convertedDate = data[0] + date[1] + date[2];
But I dislike this solution/
DateTime s = DateTime.Parse("2017-08-24 22:22:45");
Console.WriteLine(s.ToString("yyyy-MM-dd"));
More datetime .ToString() formats
https://blog.nicholasrogoff.com/2012/05/05/c-datetime-tostring-formats-quick-reference/
Other option could be:
string date = "2017-08-24 22:22:45";
string convertedDate = date.Split(' ')[0];
// Result: 2017-08-24
if Date:
string convertedDate = date.ToString("yyyy-MM-dd");
if String:
string convertedDate = data.Substring(0,10);
Simply:
var convertedDate = date.Substring(0, 10);
Your string can be converted into a DateTime object then you can use however you want.
string dateStr = "2017-08-24 22:22:45";
DateTime date = DateTime.Now;
if(DateTime.TryParse(dateStr, out date))
Console.Write(date.ToString("yyyy-MM-dd"));
Using ParseExact
var strDate = "2017-08-24 22:22:45";
DateTime myDate = DateTime.ParseExact(strDate, "yyyy-MM-dd HH:mm:ss",
System.Globalization.CultureInfo.InvariantCulture);
Console.WriteLine("Your date "+ myDate.ToString("yyyy-MM-dd"));
https://msdn.microsoft.com/en-us/library/w2sa9yss(v=vs.110).aspx
You could use a Regular Expression pattern:
var src = "2017-08-24 22:22:45";
var pattern = #"^\d{4}-\d{2}-\d{2}";
var ans = Regex.Match(src, pattern).Value;
But that is probably overkill - just extract it:
var ans = src.Substring(0, 10);
This works for you,
string date = "2017-08-24 22:22:45";
string convertedDate = date.Split(' ')[0];
So I am trying to change the language of a DateTime in C# from English to French. It was working perfectly yesterday, made a few changes (that had nothing to do with the date at all) come back today and am running into this error:
An exception o type System.FormatException occured in msorlib.dll but was not handled in user code. Additional Information: String was not recognized as a valid DateTime.
Here is my code:
string period;
period = Convert.ToString(Request.QueryString["Period"]);
string format = "dddd, MMMM dd, yyyy";
string fDate = from.ToLongDateString();
var fr = DateTime.ParseExact(fDate, format, new CultureInfo("en-US"));
var fromDate = fr.ToString("D", new CultureInfo(this.BGUser.UICultureInfoString));
string tDate = to.ToLongDateString();
var td = DateTime.ParseExact(tDate, format, new CultureInfo("en-US"));
var toDate = td.ToString("D", new CultureInfo(this.BGUser.UICultureInfoString));
if (period == null)
return "<b>" + this.Translate("Orders due ", 4386) + fromDate + " - " + toDate + "</b>";
else if (period.Equals("archive"))
return "<b>" + this.Translate("Orders due before ", 4387) + toDate + "</b>";
else if (period.Equals("future"))
return "<b>" + this.Translate("Orders due after ", 4388) + fromDate + "</b>";
It is specifically getting the error on the line
var fr = DateTime.ParseExact(fDate, format, new CultureInfo("en-US"));
The from and to are DateTime variables that are passed into the function and are correct. Any help is much appreciated!
Thanks for the comments. I took your comments into account and did this which seems to work
var fromDate = from.ToString("D", new CultureInfo(this.BGUser.UICultureInfoString));
var toDate = to.ToString("D", new CultureInfo(this.BGUser.UICultureInfoString));
DateTime time = DateTime.Now;
string newTime = time.ToShortTime();
How to convert this newTime string into DateTime format
Please try with the below code snippet.
DateTime time = DateTime.Now;
string newTime = time.ToShortTimeString();
DateTime dt = new DateTime();
DateTime.TryParse(newTime,out dt);
Note : It will set current Date.
Finaly I found an answer
const string FMT = "O";
DateTime now1 = DateTime.Now;
string strDate = now1.ToString(FMT);
DateTime now2 = DateTime.ParseExact(strDate, FMT, CultureInfo.InvariantCulture);
I have a date in the following format. It is always in this format.
yyyyMMdd -> 20130912
I need to convert it to a date. But I need to be sure that the date is converted to the correct date format of the PC. Cultureinfo.InvariantCulture. Here is what my code looks like now.
DateTime parsedDateTime;
int year = Int32.Parse(rows[row][4].ToString().Substring(0, 4));
int month = Int32.Parse(rows[row][4].ToString().Substring(4, 2));
int day = Int32.Parse(rows[row][4].ToString().Substring(6, 2));
DateTime value = new System.DateTime(year, month, day);
bool DateTimeParseFail = DateTime.TryParse(value.ToString("yyyy-MM-dd"), CultureInfo.InvariantCulture, DateTimeStyles.None, out parsedDateTime);
if (!DateTimeParseFail) {
msg = "Data Feed Convert string to DateTime: Date " + rows[row][4].ToString() + " - " + value.ToString();
ComponentMetaData.FireError(0, ComponentMetaData.Name, msg, string.Empty, 0, out pbCancel);
throw new Exception(msg);
} else {
buffer[colIndex] = parsedDateTime;
}
This just looks like overkill to me and I suspect that I'm over-thinking it. There has to be an easier way of doing this. But everything I have tried hasn't worked like I expected it.
Try this:
string dateText = rows[row][4].ToString();
DateTime date = DateTime.ParseExact(dateText, "yyyyMMdd", CultureInfo.InvariantCulture);
string result = date.ToShortDateString(CultureInfo.InvariantCulture.DateTimeFormat.ShortDatePattern);
Note that I'm assuming your assertion that the date is always in this format is correct. If it's not, you'll find that the code throws an exception.
(The code you've posted suggests that your assertion is not true, because you've got a fallback format and some failure handling there...)
Use the TryParseExact of DateTime....
var dateString = "20130912"; //rows[row][4].ToString()
DateTime parsedDateTime;
var DateTimeParseFail= DateTime.TryParseExact(dateString, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None, out parsedDateTime);
if (!DateTimeParseFail) {
msg = "Data Feed Convert string to DateTime: Date " + rows[row][4].ToString() + " - " + value.ToString();
ComponentMetaData.FireError(0, ComponentMetaData.Name, msg, string.Empty, 0, out pbCancel);
throw new Exception(msg);
} else {
buffer[colIndex] = parsedDateTime;
}
I have a DateTime object 2/19/2011 12:00:00 AM. I want to convert this object to a string 19/2/2011.
Please help me to convert DateTime to string format.
DateTime dt = DateTime.ParseExact(yourObject.ToString(), "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);
string s = dt.ToString("dd/M/yyyy", CultureInfo.InvariantCulture);
First of all, you don't convert a DateTime object to some format, you display it in some format.
Given an instance of a DateTime object, you can get a formatted string in that way like this:
DateTime date = new DateTime(2011, 2, 19);
string formatted = date.ToString("dd/M/yyyy");
As everyone else said, but remember CultureInfo.InvariantCulture!
string s = dt.ToString("dd/M/yyyy", CultureInfo.InvariantCulture)
OR escape the '/'.
You have to pass the CultureInfo to get the result with slash(/)
DateTime.Now.ToString("dd/MM/yyyy", CultureInfo.InvariantCulture)
DateTime.ToString("dd/MM/yyyy") may give the date in dd-MM-yyyy format. This depends on your short date format. If short date format is not as per format, we have to replace character '-' with '/' as below:
date = DateTime.Now.ToString("dd/MM/yyyy").Replace('-','/');
It's simple--tostring() accepts a parameter with this format...
DateTime.ToString("dd/MM/yyyy");
Here is a method, that takes datetime(format:01-01-2012 12:00:00) and returns string(format: 01-01-2012)
public static string GetDateFromDateTime(DateTime datevalue){
return datevalue.ToShortDateString();
}
You can use the ToString() method, if you want a string representation of your date, with the correct formatting.
Like:
DateTime date = new DateTime(2011, 02, 19);
string strDate = date.ToString("dd/MM/yyyy");
In C# 10 you can use DateOnly.
DateOnly date = new(2011, 02, 19);
string output = date.ToString("dd/M/yyyy", CultureInfo.InvariantCulture);
If you want the string use -
DateTime.ToString("dd/MM/yyyy")
On my login form I am showing the current time on a label.
public FrmLogin()
{
InitializeComponent();
lblTime.Text = DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss tt");
}
private void tmrTime_Tick(object sender, EventArgs e)
{
lblHora.Text = DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss tt");
}
string currentdatetime = DateTime.Now.ToString("dd'/'MM'/'yyyy");
DateTime.Parse(YOUR_DATE_OBJECT).ToShortDateString();
ToShortDateString() method will help you convert DateTime To Just Date String,format dd/mm/yyyy.
This works for me:
string dateTimeString = "21-10-2014 15:40:30";
dateTimeString = Regex.Replace(dateTimeString, #"[^\u0000-\u007F]", string.Empty);
string inputFormat = "dd-MM-yyyy HH:mm:ss";
string outputFormat = "yyyy-MM-dd HH:mm:ss";
var dateTime = DateTime.ParseExact(dateTimeString, inputFormat, CultureInfo.InvariantCulture);
string output = dateTime.ToString(outputFormat);
Console.WriteLine(output);
this is you need and all people
string date = textBox1.Text;
DateTime date2 = Convert.ToDateTime(date);
var date3 = date2.Date;
var D = date3.Day;
var M = date3.Month;
var y = date3.Year;
string monthStr = M.ToString("00");
string date4 = D.ToString() + "/" + monthStr.ToString() + "/" + y.ToString();
textBox1.Text = date4;