如何只存储日期时间的日期部分。 今天属性到SQL Server表的datetime列？

Question

I am trying to update a datetime column in a SQL Server 2012 table by using

newItem.DateSaved = DateTime.Today;

I want to save only the Date part of DateTime , but when I am checking in the table I can see that it saves also the time part: 2018-07-27 00:00:00.000 . How I can make it to store only date part? 2018-07-27 ?

Edit

Because my column is datetime , I see that I can't store only the date part. But how I can show to the user only the date part without time? Here is the select part of the Linq-to-SQL query:

select new { Date = smv.DateSaved.Value.Date }).Distinct();

Answer 1

A datetime column always has a time part - just, in your case it will all be zeros. A datatime is just a number under the hood; it doesn't have any choice about what it has / doesn't have; similarly, it doesn't have any notion of formatting until your code tries to display it, and then it is the dispalying code that chooses the format.

If you don't want a time part, use date instead of datetime for your column.

Answer 2

在SQL Server中将列类型从datetime更改为date （ https://docs.microsoft.com/en-us/sql/t-sql/data-types/date-transact-sql?view=sql-server-2017 ）

Answer 3

If you want to store only the date without time in SQL Server database you can set the column type to date

ALTER TABLE table_name
ALTER COLUMN DateSaved date; 

Reference: https://docs.microsoft.com/en-us/sql/t-sql/data-types/date-transact-sql?view=sql-server-2017

If you have a DateTime property in your model and you want to show only the date part just format it in your control in the View. For example:

$"{newItem.DateSaved:yyyy-MM-dd}"

or

newItem.DateSaved.ToString("yyyy-MM-dd")

You can also use "d" or "D" (short and long version) instead of specific format like "yyyy-MM-dd" if you want to have default formatting.

If your view is written in HTML or XAML do it there using the same formatting technique.

Answer 4

It is because your field on the database is DateTime . If you want to store just date, you should have a field with date data type. In this link , you can see the difference between the date data types.