Calculate difference between two dates number of days

Question

I see that this question has been answered for Java  JavaScript  and PHP  but not C   So  how might one calculate the number of days between two dates in C

User · Answer

First declare a class that will return later:

public void date()
{
    Datetime startdate;
    Datetime enddate;
    Timespan remaindate;

    startdate = DateTime.Parse(txtstartdate.Text).Date;
    enddate = DateTime.Parse(txtenddate.Text).Date;

    remaindate = enddate - startdate;

    if (remaindate != null)
    {
        lblmsg.Text = "you have left with " + remaindate.TotalDays + "days.";
    }
    else
    {
        lblmsg.Text = "correct your code again.";
    }
}

protected void btncal_Click(object sender, EventArgs e)
{
    date();
}

Use a button control to call the above class. Here is an example:

User · Answer

For a and b as two DateTime types   DateTime d   DateTime Now  DateTime c   DateTime Now  c   d AddDays 145   string cc  Console WriteLine d   Console WriteLine c   var t    c - d  Days  Console WriteLine t   cc   Console ReadLine

User · Answer

Difference in days  hours  and minutes   TimeSpan ts   EndDate - StartDate      Difference in days   int differenceInDays   ts Days     This is in int double differenceInDays  ts TotalDays     This is in double     Difference in Hours  int differenceInHours   ts Hours     This is in int double differenceInHours  ts TotalHours     This is in double     Difference in Minutes  int differenceInMinutes   ts Minutes     This is in int double differenceInMinutes  ts TotalMinutes     This is in double   You can also get the difference in seconds  milliseconds and ticks

User · Answer

Assuming StartDate and EndDate are of type DateTime    EndDate - StartDate  TotalDays

User · Answer

For beginners like me that will stumble upon this tiny problem  in a simple line  with sample conversion to int   int totalDays   Convert ToInt32  DateTime UtcNow Date - myDateTime Date  TotalDays     This calculates the total days from today  DateTime UtcNow Date  to a desired date  myDateTime Date    If myDateTime is yesterday  or older date than today  this will give a positive     integer result   On the other side  if the myDateTime is tomorrow or on the future date  this will give a negative  -  integer result due to rules of addition   Happy coding

User · Answer

You can use the code below    int DateDifInSecond   EndDate Subtract StartDate  TotalSeconds

User · Answer

In case someone wants numer of whole days as a double  a  b of type DateTime      a Date - b Date  TotalDays

User · Answer

The top answer is correct  however if you would like only WHOLE days as an int and are happy to forgo the time component of the date then consider    EndDate Date - StartDate Date  Days   Again assuming StartDate and EndDate are of type DateTime

User · Answer

You can try this  EndDate Date Subtract DateTime Now Date  Days

User · Answer

Get the difference between the two dates and then get the days from   int total days    EndDate - StartDate  TotalDays

User · Answer

DateTime xmas   new DateTime 2009  12  25   double daysUntilChristmas   xmas Subtract DateTime Today  TotalDays

User · Answer

Use TimeSpan object which is the result of date substraction   DateTime d1  DateTime d2  return  d1 - d2  TotalDays

User · Answer

protected void Calendar1 SelectionChanged object sender  EventArgs e        DateTime d   Calendar1 SelectedDate         int a      TextBox2 Text   d ToShortDateString        string s   Convert ToDateTime TextBox2 Text  ToShortDateString        string s1    Convert ToDateTime Label7 Text  ToShortDateString        DateTime dt   Convert ToDateTime s  Date      DateTime dt1   Convert ToDateTime s1  Date      if  dt  lt   dt1                Response Write   lt script gt alert   Not a valid Date to extend warranty   lt  script gt               else               string diff   dt Subtract dt1  ToString            Response Write diff           Label18 Text   diff          Session  diff     Label18 Text

User · Answer

There often is a debate on time  hours  when it comes to counting days between two dates  The responses to the question and their comments show no exception  If performance is not a concern  I would strongly recommend documenting your calculation through intermediate conversions  For example   EndDate - StartDate  Days is unintuitive because rounding will depend on the hour component of StartDate and EndDate   If you want the duration in days to include fractions of days  then as already suggested use  EndDate - StartDate  TotalDays  If you want the duration to reflect the distance between two days  then use  EndDate Date - StartDate Date  Days If you want the duration to reflect the duration between the morning of the start date  and the evening of the end date  what you typically see in project management software   then use  EndDate Date - StartDate Date  Days   1

User · Answer

Using a timespan would solve the problems as it has many attributes   DateTime strt date   DateTime Now  DateTime end date   Convert ToDateTime  10 1 2017 23 59 59      DateTime add days   end date AddDays 1   TimeSpan nod    end date - strt date   Console WriteLine strt date        end date             nod TotalHours        Console ReadKey

User · Answer

I think this will do what you want   DateTime d1   DateTime Now  DateTime d2   DateTime Now AddDays -1    TimeSpan t   d1 - d2  double NrOfDays   t TotalDays

[c#] Calculate difference between two dates (number of days)?

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