How to check if a DateTime occurs today?

Question

if (newsStory.WhenAdded.Date == DateTime.Today)
{

}
else
{

}

Should do the trick.

if( newsStory.Date == DateTime.Today )
{
    // happened today
}

Try

if (newsStory.Date == DateTime.Now.Date) 
{ /* Story happened today */ }
else
{ /* Story didn't happen today */ }

My solution:

private bool IsTheSameDay(DateTime date1, DateTime date2)
{
    return (date1.Year == date2.Year && date1.DayOfYear == date2.DayOfYear);
}

If NewsStory was using a DateTime also, just compare the Date property, and you're done.

However, this depends what "today" actually means. If something is posted shortly before midnight, it will be "old" after a short time. So maybe it would be best to keep the exact story date (including time, preferably UTC) and check if less than 24 hours (or whatever) have passed, which is simple (dates can be subtracted, which gives you a TimeSpan with a TotalHours or TotalDays property).

You can implement a DateTime extension method.

Create new class for your extension methods:

namespace ExtensionMethods
{
    public static class ExtensionMethods
    {
        public static bool IsSameDay( this DateTime datetime1, DateTime datetime2 )
        {
            return datetime1.Year == datetime2.Year 
                && datetime1.Month == datetime2.Month 
                && datetime1.Day == datetime2.Day;
        }
    }
}

And now, everywhere on your code, where do you want to perform this test, you should include the using:

using ExtensionMethods;

And then, use the extension method:

newsStory.WhenAdded.IsSameDay(DateTime.Now);