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02.20.2007 at 07:08AM PST, ID: 22401001

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6.8

Valid date using C#

Zone: Microsoft Visual C#.Net

Tags: date

i have a string variable in which i get values from 3 different date variable and make it look like a date

eg validdate = requestdate1.month + "/" + requestdate2.day + "/" + requestdate3.year

i want to compare the validdate and see whether it is actually a valid date.

so lets say if get a validdate = "2/30/2007" or "4/31/2007"

i would like to convert those dates into 2/28/2007 or 4/30/2007.

so basically i want to convert any invalid date into last day of that given month.

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Question Stats

Zone: Programming

Question Asked By: pratikshahse

Solution Provided By: Ehrick

Participating Experts: 3

Solution Grade: A

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02.20.2007 at 07:29AM PST, ID: 18571200

jijeesh:

Use TryParse() method to validate a date and if it's invalid reduce day by one and try parse again util you get a valid one. Implement using recursive call.

private DateTime GetValidDate(int day, int month, int year)
{
DateTime date;
string dateText = month + "/" + day + "/" + year;
bool isValid = DateTime.TryParse(dateText, DateTimeFormatInfo.InvariantInfo,
DateTimeStyles.None, out date);
if(isValid)
{
return date;
}
else
{
GetValidDate(day--, month, year);
}
}

02.20.2007 at 07:51AM PST, ID: 18571384

pratikshahse:

I am getting couple errors 1 on DateTimeFormatInfo
( The type or namespace name 'DateTimeFormatInfo' could not be found (are you missing a using directive or an assembly reference?)

2 on DateTimeStyles
(The type or namespace name 'DateTimeStyles' could not be found (are you missing a using directive or an assembly reference?)

how do i fix that?

02.20.2007 at 08:00AM PST, ID: 18571462

jijeesh:

plz include

using System.Globalization;

~jme

02.20.2007 at 08:07AM PST, ID: 18571529

pratikshahse:

throws me an error over here now
bool isValid = DateTime.Parse(dateText, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None);

Cannot implicitly convert type 'System.DateTime' to 'bool'

And also i took out the 4 arguement as it said its not allowed

02.20.2007 at 08:19AM PST, ID: 18571634

jijeesh:

Its bool isValid = DateTime.TryParse(dateText, DateTimeFormatInfo.InvariantInfo,
DateTimeStyles.None, out date);

Please refer my solution.

02.20.2007 at 08:23AM PST, ID: 18571664

pratikshahse:

then it gives me this error
'System.DateTime' does not contain a definition for 'TryParse'

02.20.2007 at 08:32AM PST, ID: 18571755

jijeesh:

I think you are using VS 2003, my code was written in VS2005. So, please do the necessary changes in the method to work with VS2003.

02.20.2007 at 08:50AM PST, ID: 18571904

Ehrick:

You could use a try...catch block to test for an error, although this is generally considered bad practice. To do this, modify jijeesh's suggestion to be:

private DateTime GetValidDate(int day, int month, int year)
{
DateTime date;
try
{
date = new DateTime(year, month, day);
}
catch(ArgumentOutOfRangeException e)
{
date = GetValidDate(--day,month,year);
}
return date;
}

Most of that code is, of course, jijeesh's.
If you don't like the idea of a try..catch block, you could write a method that specifically checks the day based on the month (so you'd have a function that returned the number of days in a certain month, for example). That would require a fair bit more coding.

Accepted Solution

02.20.2007 at 11:05AM PST, ID: 18572943

pratikshahse:

yes my code is in VS2003. what is equivalent to tryparse in 2003. i tried using .Parse and .ParseExact and they both are giving me error "Cannot implicitly convert type 'System.DateTime' to 'bool'

EmrahZengin

04.05.2008 at 03:03PM PDT, ID: 21289830

Also DateTime.DaysInMonth is a good Method for kind of these stuff.

         
              private DateTime GetValidDate(int day, int month, int year)
   {
      DateTime date;
      int dayMax = DateTime.DaysInMonth(year, month);
      int newDay = day;
      if (day > dayMax || day <1) 
            newDay = DayMax;
 
      date = new DateTime(year, month, newDay);
      return date;
   }

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