No DateTime?.ToString(string) overload?

Question

I am aware of the standard procedure for displaying a DateTime in a custom format, like so:

MessageBox.Show(dateSent.ToString(\"dd/MM/yyyy hh:mm:s

Answer 1

Instead of having to manually perform a null check every time, you can write an extension method.

 public static string ToStringFormat(this DateTime? dt, string format)
 {
      if(dt.HasValue) 
         return dt.Value.ToString(format);
      else
         return "";
 }

And use it like this (with whatever string format you want)

 Console.WriteLine(myNullableDateTime.ToStringFormat("dd/MM/yyyy hh:mm:ss"));

Answer 2

You can still use

variableName.Value.ToString(customFormat);

Answer 3

DateTime? is syntactic sugar for Nullable<DateTime> and that's why it don't have ToString(format) overload.

However, you can access underlying DateTime struct using Value property. But before that use HasValue to check, if the value exists.

MessageBox.Show(dateSent.HasValue ? dateSent.Value.ToString("dd/MM/yyyy hh:mm:ss") : string.Empty)