I want to display a message only when the datetime is before or on todays date. Here is what I have:
var todaysdate = DateTime.Today;
if (acct.maturityDate <= todaysdate )
{
maturityText.Visible = true;
}
I get a message saying that (acct.maturityDate <= todaysdate ).
Cannot apply operator '<=' to operands of type 'string' and 'system.datetime', candidates are bool <=(system.datetime,system.datetime) (in struct datetime).
Any help is appreciated.
As the error says, maturityData is a string and not a DateTime you need to convert it:
var todaysdate = DateTime.Today;
if (DateTime.Parse(acct.maturityDate) <= todaysdate ) {
maturityText.Visible = true;
}
I'm making a direct parse there, you might want to consider TryParse or ParseExact depending on your needs.
This means that the property acct.maturityDate is of the type string and not the expected type System.DateTime. Convert/parse the property to a DateTime and your problem should be solved, or make sure the property is already a DateTime.
As mentioned in my comment, the type of maturityDate is a string. using DateTime.Parse() would allow you to resolve your issues and so will DateTime.TryParseExact()
Converting to the correct type will allow you to use the correct operators.
Firstly you have to change maturityDate to DateTime type, and then you should use DateTime.Compare method you can refer to this link
If maturityDate must be left as-is, you can either use the DateTime.Parse, DateTime.TryParse, or DateTime.TryParseExact methods.
Parse will throw an exception if maturity date cannot be parsed.
TryParse and TryParseExact will not throw exceptions, but will allow you to make a decision based on whether the date is able to be parsed.
TryParseExact allows you to parse your date even if it doesn't match a standard DateTime format. You simply specify the format string, as well as culture and style information, in the method parameters.
Parse Example:
var todaysdate = DateTime.Today;
if (DateTime.Parse(acct.maturityDate) <= todaysdate ) {
maturityText.Visible = true;
}
TryParse Example:
var todaysdate = DateTime.Today;
DateTime dt;
if (DateTime.TryParse(acct.maturityDate, out dt)
{
if (dt <= todaysdate)
{
maturityText.Visible = true;
}
}
TryParseExact Example:
var todaysdate = DateTime.Today;
DateTime dt;
// use whatever format string matches appropriately
if (DateTime.TryParseExact(acct.maturityDate, "YYYY-MM-dd HH:mm:ss"
, CultureInfo.InvariantCulture
, DateTimeStyles.None, out dt)
{
if (dt <= todaysdate)
{
maturityText.Visible = true;
}
}
Related
How can I convert a system date format (like 3/18/2014) to the format readable in DateTime?
I wanted to get the total days from two dates, which will come from two TextBoxes.
I have tried this syntax:
DateTime tempDateBorrowed = DateTime.Parse(txtDateBorrowed.Text);
DateTime tempReturnDate = DateTime.Parse(txtReturnDate.Text);
TimeSpan span = DateTime.Today - tempDateBorrowed;
rf.txtDaysBorrowed.Text = span.ToString();
But tempDateBorrowed always returns the minimum date for a DateTime varibale. I think this is because DateTime does not properly parse my system date format. As a consequence, it incorrectly displays the number of days. For example, if I try to enter 3/17/2014 and 3/18/2014 respectively, I always get -365241 days instead of 1.
Edit: I wanted my locale to be non-specific so I did not set a specific locale for my date format. (My system format by the way is en-US)
Try DateTime.ParseExact method instead.
See following sample code (I've used strings instead of TextBoxes since I used a Console app to write this code). Hope this helps.
class Program
{
static void Main(string[] args)
{
string txtDateBorrowed = "3/17/2014";
string txtReturnDate = "3/18/2014";
string txtDaysBorrowed = string.Empty;
DateTime tempDateBorrowed = DateTime.ParseExact(txtDateBorrowed, "M/d/yyyy", null);
DateTime tempReturnDate = DateTime.ParseExact(txtReturnDate, "M/d/yyyy", null);
TimeSpan span = DateTime.Today - tempDateBorrowed;
txtDaysBorrowed = span.ToString();
}
}
ToString is not Days
TimeSpan.TotalDays Property
You can try specifying the format of the datetime in the textboxes like this
DateTime tempDateBorrowed = DateTime.ParseExact(txtDateBorrowed.Text.Trim(), "M/d/yyyy", CultureInfo.InvariantCulture);
DateTime tempReturnDate = DateTime.ParseExact(txtReturnDate.Text.Trim(), "M/d/yyyy", CultureInfo.InvariantCulture);
Also you may have to check if the values from the textboxes are valid.
My first thought is to just replace the TextBox controls with a DateTimePicker or equivalent, depending on what platform you're developing on. Converting strings to dates or vice-versa is more of a pain than it seems at first.
Or you could try using DateTime.ParseExact instead, to specify the exact expected format:
DateTime tempDateBorrowed =
DateTime.ParseExact("3/17/2014", "M/dd/yyyy", CultureInfo.InvariantCulture);
Or you could specify a specific culture in the call to DateTime.Parse:
var tempDateBorrowed = DateTime.Parse("17/3/2014", new CultureInfo("en-gb"));
var tempDateBorrowed = DateTime.Parse("3/17/2014", new CultureInfo("en-us"));
try formatting your date to iso 8601 or something like that before parsing it with DateTime.Parse.
2014-03-17T00:00:00 should work with DateTime.Parse. ("yyyy-MM-ddTHH:mm:ssZ")
Try this:
if(DateTime.TryParseExact(txtDateBorrowed.Text, "M/d/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out tempDateBorrowed))
{
TimeSpan span = DateTime.Today - tempDateBorrowed;
}
I have a program that has synchronization. That means I need to save the last synchronization date and check if it needs to be synchronized.
So, I have this:
IS.SaveContactsRetrieveDate(DateTime.Now.ToString("dd.MM.yyyy"));
Saving a date to Isolated Storage.
Then, when I call IF:
DateTime toDate = DateTime.Now;
string contactsRetriveDate = IS.ReadContactsRetriveDate();
if (contactsRetriveDate == "" || DateTime.Compare(toDate, DateTime.Parse(contactsRetriveDate)) == 1)
{
MessageBox.SHow("");
}
The problem is that when user changes the region code fails here:
DateTime.Compare(toDate, DateTime.Parse(contactsRetriveDate))
With incorrect input error.
I understand that Latvian format is dd.MM.yyyy and USA MM/dd/yyyy - but I can't find a solution...
I need all datetime parsed in one format, so I could add days, weeks and compare date.
You should serialize and deserialize your date in a culture-independent manner (where "d" is the "Short date pattern" of the Standard Date and Time Format Strings):
var s = DateTime.Now.ToString("d", CultureInfo.InvariantCulture);
var d = DateTime.Parse(s, CultureInfo.InvariantCulture);
You can use ParseExact
DateTime.ParseExact(datestring, "dd.MM.yyyy", System.Globalization.CultureInfo.InvariantCulture);
you already know format so you can go for this, but make sure the string is in same format and never changes.
u can try this one:
DateTime toDate = DateTime.Now;
string contactsRetriveDate = IS.ReadContactsRetriveDate();
DateTime contactsRetriveDat = Convert.ToDateTime(contactsRetriveDate);
if (contactsRetriveDate == "" || toDate.CompareTo(contactsRetriveDat)==0)
{
MessageBox.SHow("");
}
I have the following method in order to verify whether a string is a valid datetime:
public bool isDate(string date)
{
bool check = false;
try
{
DateTime converted_date = Convert.ToDateTime(date);
check = true;
}
catch (Exception)
{
check = false;
}
return check;
}
Now, the exception "String was not recognized as valid datetime" is caught whenever I try to pass a string like this:
"12/31/2013 12:00:00 AM"
I cannot understand why this is happening. Can someone help me solve this please?
Instead of the try/catch block, try the built in TryParse method in the DateTime class. It takes your string as a parameter and if it converts successfully it will place the value in the "result" variable. It returns a boolean value representing whether it worked or not.
public bool isDate(string date)
{
var result = new DateTime();
return DateTime.TryParse(date, out result);
}
Most likely your current culture settings are different from the format date is provided in. You can try specifying the culture explicitly:
CultureInfo culture = new CultureInfo("en-US"); // or whatever culture you want
Convert.ToDateTime(date, culture);
You can also use DateTime.TryParseExact and pass a format string (eg. MM/dd/yy H:mm:ss zzz, see more here) to check if the date has a specific format.
I am using Datetime.TryParse method to check the valid datetime. the input date string would be any string data. but is returning false as the specify date in invalid.
DateTime fromDateValue;
if (DateTime.TryParse("15/07/2012", out fromDateValue))
{
//do for valid date
}
else
{
//do for in-valid date
}
Edit: I missed. I need to check the valid date with time as "15/07/2012 12:00:00".
Any suggestions are welcome.
You could use the TryParseExact method which allows you to pass a collection of possible formats that you want to support. The TryParse method is culture dependent so be very careful if you decide to use it.
So for example:
DateTime fromDateValue;
string s = "15/07/2012";
var formats = new[] { "dd/MM/yyyy", "yyyy-MM-dd" };
if (DateTime.TryParseExact(s, formats, CultureInfo.InvariantCulture, DateTimeStyles.None, out fromDateValue))
{
// do for valid date
}
else
{
// do for invalid date
}
You should be using TryParseExact as you seem to have the format fixed in your case.
Something like can also work for you
DateTime.ParseExact([yourdatehere],
new[] { "dd/MM/yyyy", "dd/M/yyyy" },
CultureInfo.InvariantCulture,
DateTimeStyles.None);
As the others said, you can use TryParseExact.
For more informations and the use with the time, you can check the MSDN Documentation
I want today's date in mm/dd/yyyy format from a DateTime variable. How to get it?
I need to check this with some date variable so it must be also in date variable format?plz help
Ex: i need to get today date in mm/dd/yyyy format and i already date which is datetime datatype in mm/dd/yyyy format and i have to compare them
You should use DateTime.Today:
DateTime today = DateTime.Today; // As DateTime
string s_today = today.ToString("MM/dd/yyyy"); // As String
Edit: You edited your post to add another question, so here comes my edit to supply at least some sort of answer.
Update While you can use DateTime.Compare() you should use plain comparisson:
if(today < otherdate)
{
// Do something.
}
Alternatively, you can use DateTime-variables to check against other DateTime-variables using the DateTime.Compare() method. Both otpions will work and it comes down to preference and what you want to do with the result.
int result = DateTime.Compare(today, otherdate);
if(result < 0)
MessageBox.Show("Today is earlier than the 'otherdate'");
elseif(result > 0)
MessageBox.Show("Today is later than the 'other date'");
else
MessageBox.Show("Dates are equal...");
string datestring = DateTime.Now.ToString("MM/dd/yyyy");
MSDN say: Custom Date and Time Format Strings
To convert DateTime variable to string in the specified format:
DateTime d = ...;
string s = d.ToString("MM/dd/yyyy");
If you want to compare only date part of DateTime, not time part:
DateTime d1 = DateTime.Parse("10/10/2011");
DateTime d2 = DateTime.Parse("01/01/2011");
if (d1.Date > d2.Date)
{
// do the stuff
}
DateTime.Now.ToString("MM/dd/yyyy");
DateTime.Today.ToString("MM/dd/yyyy");
DateTime.Parse is what you are looking for...