Cannot implicitly convert type System DateTime to System DateTime An explicit conversion exists

Question

I am trying to convert datetime  todatetime but I get this Error      Error 7   Cannot implicitly convert type  System DateTime   to    System DateTime   An explicit conversion exists   Here is my code   public string ConvertToPersianToShow DateTime   datetime      DateTime dt    string date    dt   datetime     string year   Convert ToString persian date GetYear dt      string month   Convert ToString persian date GetMonth dt      string day   Convert ToString persian date GetDayOfMonth dt       if  month Length    1           month    0    Convert ToString persian date GetMonth dt          if  day Length    1           day    0    Convert ToString persian date GetDayOfMonth dt             date   Convert ToString persian date GetYear dt              Convert ToString persian date GetMonth dt               Convert ToString persian date GetDayOfMonth dt      date   year         month         day     dt Hour     dt Minute         return date

User · Answer

The problem is that you are passing a nullable type to a non-nullable type.

You can do any of the following solution:

A. Declare your dt as nullable

DateTime? dt = dateTime;

B. Use Value property of the the DateTime? datetime

DateTime dt = datetime.Value;

C. Cast it

DateTime dt = (DateTime) datetime;

User · Answer

dt is nullable you need to access its Value  if  datetime HasValue      dt   datetime Value    It is important to remember that it can be NULL  That is why the nullablestruct has the HasValue property that tells you if it is NULL or not   You can also use the null-coalescing operator    to assign a default value  dt   datetime    DateTime Now    This will assign the value on the right if the value on the left is NULL

User · Answer

You have 3 options   1  Get default value  dt   datetime  DateTime Now    it will assign DateTime Now  or any other value which you want  if datetime is null  2  Check if datetime contains value and if not return empty string  if  datetime HasValue  return     dt   datetime Value    3  Change signature of method to   public string ConvertToPersianToShow DateTime  datetime    It s all because DateTime  means it s nullable DateTime so before assigning it to DateTime you need to check if it contains value and only then assign

User · Answer

you should be using the  Value of the datetime parameter  All Nullable structs have a value property which returns the concrete type of the object  but you must check to see if it is null beforehand otherwise you will get a runtime error   i e   datetime Value   but check to see if it has a value first   if  datetime HasValue          work with datetime Value

[c#] Cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'. An explicit conversion exists

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