C# initialize datetime to null

Accept Solution Reject Solution. You define the datetime variable as nullable: C. Posted 5-Sep pm Wendelius. Sergey Alexandrovich Kryukov 6-Sep am. Correct, my 5. OP needs to learn basics of. NET types. Wendelius 6-Sep am. Thanks, I agree. Member 6-Sep am. If you define the datetime as nullable, it's default value is null , not any date. Especially when you have explicitely set the variable to null, the default doesn't even matter.

Sounds like you're either using a different variable or you set it somewhere else. Use the debugger and with a watch, see the changes that are taking place concerning this variable. DateTime is not nullable type. Posted 5-Sep pm Prerak Patel. Don't mix up default time with null. Null should be used to carry semantic if "undetermined time, no time". I would prefer the simpler-to-use variant shown by Mika though, please see. Well, Here is the fundamental stuff of nullable DateTime.

Instead of assigning the DateTime to null, you can use the readonly field DateTime. In the base class library, the MinValue field is a public static readonly field. It won't change throughout your program's execution. Info We looked at the exact value of DateTime. C program that shows null DateTime and MinValue.

When you try to assign a DateTime to the null literal in the C language, The compiler will give an error "Cannot convert null to System. The null value in the language is only used on reference types. Using C.

I have a string dateTimeEnd. Could you please help me out to define what is wrong in my code? Parse dateTimeEnd ; eventCustom. GibboK GibboK Add a comment.

Active Oldest Votes. It looks like you just want: eventCustom. An alternative would be: DateTime validValue; eventCustom. TryParse dateTimeEnd, out validValue? Jon Skeet Jon Skeet 1. Shouldn't this be other way around? Will fix. Rather default DateTime? GertArnold: They're equivalent - it doesn't matter which you use.

DateTime is a non-nullable value type DateTime? Rahul Rahul 5, 6 6 gold badges 32 32 silver badges 56 56 bronze badges. This should work: if! The year 1 through the number of years in calendar. The month 1 through the number of months in calendar.

The calendar that is used to interpret year , month , and day. The first call instantiates a DateTime value by using a PersianCalendar object. Because the Persian calendar cannot be designated as the default calendar for a culture, displaying a date in the Persian calendar requires individual calls to its PersianCalendar.

GetMonth , PersianCalendar. GetYear methods. The second call to the constructor instantiates a DateTime value by using a HijriCalendar object. The example changes the current culture to Arabic Syria and changes the current culture's default calendar to the Hijri calendar.

Because Hijri is the current culture's default calendar, the Console. WriteLine method uses it to format the date. When the previous current culture which is English United States in this case is restored, the Console. WriteLine method uses the current culture's default Gregorian calendar to format the date.

The allowable values for year , month , and day depend on calendar. An exception is thrown if the specified date and time cannot be expressed using calendar. Eras in the Japanese calendars are based on the emperor's reign and are therefore expected to change.