How to Declare Null value in Datetime

Question

if (date2 == ) { date2 = null; } DateTime dates2 = DateTime.ParseExact(date2 dd-MM-yyyy H:mm CultureInfo.InvariantCulture); by using this code i got an Error 'String reference not set to an instance of a String.'.

Ehsan Sajjad · Answer

You can use Nullable DateTime in this case and your code can be made more simple like: DateTime?dates2= null ; if (!String.IsNullOrEmpty(date2)) { dates2=DateTime.ParseExact(date2 dd-MM-yyyyH:mm CultureInfo.InvariantCulture); }

Vinay Singh · Answer

Hi Try the below link http://www.dotnetperls.com/nullable-datetime Since DateTime is a value type you cannot assign null to it but exactly for these cases (absence of a value) Nullable was introduced - use a nullable DateTime instead: DateTime?myTime= null ;

Rafnas T P · Answer

if (date2 == ) { date2 = DBNull.Value; }

Francis · Answer

decalare datetime as nullable like below it will solve your issue: DateTime ? dt ; dt = null ;