How to calculate months between two datetimepicker in C#

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Good day everyone please i want to calculate months differences between two date time picker. And i want it to give me an error if it more than one year. the code here is for if the dates choosen has not expired

What I have tried:

<pre>DateTime reqdt = dtrequest.Value.Date;
DateTime retdt = dtreturn.Value.Date;

TimeSpan ts = retdt - reqdt;
int days = ts.Days;
if (days <= 0)
{
MessageBox.Show("Date Expired");
}
else
{
MessageBox.Show("better");

lbldiff.Text = days.ToString() + "Days";

Posted 24-May-19 15:08pm

akinwunmi

Updated 24-May-19 19:40pm

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3 solutions

Solution 1

Quote:
i want to calculate months differences between two date time

You basically have 2 solutions:
- Either you say that a month is roughly 31.5 days and use the number of days for the calculation.
- Either you do the calculation yourself by handling years, months and days of both dates.
it will look like:

C#

NbMonths= ( retdt.year - reqdt.year ) * 12 + ( retdt.month - reqdt.month )
if ( retdt.day < reqdt.day ) {
  NbMonths--
}

Posted 24-May-19 18:10pm

Patrice T

Solution 2

If you need a more accurate calculation, that takes internationalization (Culture/Calendar) into account, CodeProject has an excellent article/code-library by Jani Giannoudis: [^]. This is being developed on GitHub now, and updated for .NET Core, Mono, Xamarin and UWP.

You can examine the (complex) code in the 'DateDiff class to see how total months are calculated.

Another full featured C# library for Date/Time calculations is Jon Skeet's 'NodaTime: [^] ... on GitHub: [^]

Posted 24-May-19 18:42pm

BillWoodruff

Updated 24-May-19 18:53pm

v2

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George Swan · Accepted Answer · 2019-05-24T19:41:00

Solution 3

C#

//The trick here is to use the AddYears method
DateTime firstDate = DateTime.Now;
DateTime secondDate= firstDate.AddDays(367);
DateTime expiryDate = firstDate.AddYears(1);
string msg = secondDate > expiryDate ? "Expired" : "Not Expired";
Console.WriteLine(msg);

Posted 24-May-19 19:41pm

George Swan