C# How would I check if a date that is currently a string is today?

Question

I have a date that is in a format called \'String(Generalized-Time)\', see MSDN linked here , I need to check if this date is today and if it is do X.

To complicate thi

Answer 1

Like this:

   DateTime dt;
   if (DateTime.TryParse(stringValue, out dt) && 
       dt.Date == DateTime.Today)
   {
       // do some stuff
   }

To check if it's anytime within the last four days,

   DateTime dt;
   if (DateTime.TryParse(stringValue, out dt) && 
       dt.Date > DateTime.Today.AddDays(-4f) &&
       dt < DateTime.Now)
   {
       // do some stuff
   }

or, as an extension method

public static bool WithinPreviousPeriod(this DateTime dt, int daysBack)
{
     return dt.Date > DateTime.Today.AddDays(-daysBack))
             && dt < DateTime.Now;
}

Answer 2

if(DateTime.Parse(yourString).Date == DateTime.Now.Date )
{
  //do something
}

Should see if the day is today. However this is missing error checking (it assumes yourString is a valid datetime string).

To do the more complicated check you could do:

DateTime date = DateTime.Parse(yourString);
int dateOffset = 4;

if(date.Date >= DateTime.Now.AddDays(-dateOffset).Date)
{
//this date is within the range!
}