仅从 DateTime 对象获取 Date 或 Time

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最佳答案

var day = value.Date; // a DateTime that will just be whole days
var time = value.TimeOfDay; // a TimeSpan that is the duration into the day

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You can also use DateTime.Now.ToString("yyyy-MM-dd") for the date, and DateTime.Now.ToString("hh:mm:ss") for the time.

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You can use Instance.ToShortDateString() for the date,
and Instance.ToShortTimeString() for the time to get date and time from the same instance.

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Sometimes you want to have your GridView as simple as:

  <asp:GridView ID="grid" runat="server" />

You don't want to specify any BoundField, you just want to bind your grid to DataReader. The following code helped me to format DateTime in this situation.

protected void Page_Load(object sender, EventArgs e)
{
grid.RowDataBound += grid_RowDataBound;
// Your DB access code here...
// grid.DataSource = cmd.ExecuteReader(CommandBehavior.CloseConnection);
// grid.DataBind();
}


void grid_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType != DataControlRowType.DataRow)
return;
var dt = (e.Row.DataItem as DbDataRecord).GetDateTime(4);
e.Row.Cells[4].Text = dt.ToString("dd.MM.yyyy");
}

The results shown here. DateTime Formatting

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var currentDateTime = dateTime.Now();
var date=currentDateTime.Date;

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With the .NET 6 which added DateOnly and TimeOnly structs it's now possible to get the date and time like this:

var dateTime = DateTime.Now;
var date = DateOnly.FromDateTime(dateTime);
var time = TimeOnly.FromDateTime(dateTime);

Docs:

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Use this: if dt = DateTime.Now;

var DateOnly = new DateTime(dt.Year, dt.Month, dt.Day);