is it possible to change from DateTime? to DateTime?

The question is what datetime value should you pass into the inner method, if the outer method receives null DateTime?

One way is to pass in DateTime.MinValue:
if (dateTime == null)
  InnerMethod(DateTime.MinValue);

Another way is to skip calling InnerMethod altogether if DateTime is null:
if (dateTime != null)
  InnerMethod(dateTime);

thank you for your answer,
i didnot succed with your help,

here's the situation.

i have an object drain wich contain the following getter:

OBJET DRAIN
 public DateTime?  DrainDate
        {
            set { DrainDate_ = value ; }
            get
            {
                return ((DrainDate_ != null)? DrainDate_ : DateTime.MinValue);
            }
           
        }

when i try to get the value i receive the error : cannot  convert from nullable datetime to target datetime.

  foreach (Drain currentDrain in _Drains)
                {
                    DateTime _currentDrainDate = currentDrain.DrainDate;

this last line refuses to accept my value.
any idea, on how to do it?

ok, i could change the line like this:
foreach (Drain currentDrain in _Drains)
                {
                    DateTime? _currentDrainDate = currentDrain.DrainDate;

and it will pass,
the problem is that i use _currentDrainDate later on my inner method,
and the method i give it to ,  is not declare with a parameter of type "DateTime?" but "DateTime"

thank you very much,

i didnt think about trying that,
i try several things but not that cast,
"IT DID IT" , as we say in french switzerland ;o)

best regards.