Given that my response is about 8 years later you are probably an expert C programmer by now :. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. DateTime "null" value Ask Question. Asked 13 years, 2 months ago. Active 1 year, 10 months ago. Viewed k times. Improve this question. Mats Mats Add a comment. Active Oldest Votes. You can also use a nullable DateTime, like this: DateTime? MinValue : default DateTime or, in more recent versions of C , default. Improve this answer. Dan 6, 4 4 gold badges 36 36 silver badges 87 87 bronze badges.
Joel Coehoorn Joel Coehoorn k gold badges silver badges bronze badges. It would greatly help if you provide an example of how to use it. It's also good to note that when you DO initialize them and with null, they are assigned DateTime.
MinValue as well — Jeff LaFay. Value; to read from it, and if MyNullableDate. HasValue to check if it is null — satibel.
If you're using. NET 2. Mark Ingram Mark Ingram You can use nullable types even in earlier versions of. NET, no need for 3. It came in. NET in 3. Nullable types are available in. Net 2. C has had the shorthand? Only VB. Net didn't have the shorthand? MinValue; — Joel Coehoorn. I would use dt.
GetValueOrDefault -- it's the most efficient option. Iman Iman This helped me discover passing just null doesn't work.
It needs to be DateTime? Following way works as well myClass. Now : DateTime? Iman Aleksei Aleksei 1, 9 9 silver badges 13 13 bronze badges. David Mohundro David Mohundro It is worth pointing out that, while a DateTime variable cannot be null , it still can be compared to null without a compiler error: DateTime date; You can use a nullable class.
Aaron Smith Aaron Smith 3, 4 4 gold badges 27 27 silver badges 25 25 bronze badges. The user could then simply not enter a value into this box make sure you tick allow blanks. Setting a default value in the textbox with the expected format of the Date helps with managing. I haven't tested this specific example yet, however we use Date as String parameters and that works fine. Hopefully this gives you a few ideas or a step in the right direction. Unfortunately doesn't work.
When I run the report I have to select the date to be able to view the result. To sum up: I need a datetime parameter that can be set to blank null , but the checkbox next to it saying "NULL" is not accepted by my users.
I'm having the same issue and this is driving me crazy. Have you found any solution If so please share.. That would be really helpful. My work around for this is to create a dataset that with the following query:. Worked perfect for me.
Sign in. United States English. Ask a question. Quick access. TryParseExact methods. More on this visit here. Calendar class is an abstract class which is present in System. Globalization namespace. There are different types of Calendar available in. Net framework. Replace "System. GetYear DateTime.
GetMonth DateTime. A calendar divides into multiple eras. Net framework it supports only one era except JapaneseCalendar supports multiple. ToDateTime year, month, day, 0, 0, 0, 0, era ; Console. GetMonth date2 , cal.
GetDayOfMonth date2 , cal. GetYear date2 , cal. It is present in System namespace. You need to call static members and methods. WriteLine z. ToUniversalTime DateTime. ConvertTime DateTime. Now, TimeZoneInfo. Local, tzObject ; Console. WriteLine "1. IsDaylightSavingTime tstTime? DaylightName : tzObject. Local, tzObject1 ; Console. WriteLine "2. IsDaylightSavingTime tstTime2? DaylightName : tzObject1. ConvertTime ut1, TimeZoneInfo. Utc, tzObject2 ; Console.
WriteLine "3. IsDaylightSavingTime tstTime3? DaylightName : tzObject2. Net uses CultureInfo class for providing information about specific culture. The information is writing system, date, number, string, and calendar. It is present in System. TryParse dateInHindi, new System. CultureInfo "hi-IN" , System. Net version foreach CultureInfo ci in CultureInfo. GetCultures CultureTypes. WriteLine ci. It is a structure type like DateTime. It is introduced in. Net framework 3. It provides precise information because it contains offset from Date and Time is taken.
Offset Returns the time offset from UTC. It provides a better way to work with different times from different time zones. Now; dateTimeObj. Parse DateTime. UtcNow, TimeZoneInfo.
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