Question

I’ve found that the Date.TryParse is pretty lenient on input – so skipping out the day or month will still return a value, though always floor rounded. E.g.:

DateTime.TryParse("2010", out testDate)
-> 01 Jan 2010

or

DateTime.TryParse("may 2010", out testDate)
-> 01 May 2010

I’d like to allow the user to input a date to be used as the upper date limit for a search – Is there a simple way to get it to round up – e.g.: return 31/12/2010 when just ‘2010’ is entered…

Thanks in advance.

Answer 1

You could have something like this:

string inputDate = "May 2010";
int year = 0;
DateTime date = new DateTime();

// Try to parse just by year.
// Otherwise parse by the input string.
if (int.TryParse(inputDate, out year))
{
    date = new DateTime(year, 12, 31);
}
else
{
    // Parse the date and set to the last day of the month.
    if (DateTime.TryParse(inputDate, out date))
    {
        date = date.AddMonths(1).AddMilliseconds(-1);
    }
    else
    {
        // Throw exception for invalid date?
    }
}