how to convert string into datetime

Declare @date_and_time varchar(100);

set @date_and_time= '04/29/23 01:29:55'
select Cast(@date_and_time as datetime)

print Cast(@date_and_time as datetime)

you can try below code :-

SELECT CONVERT(datetime, '2023-05-07 12:34:56', 120) As Todaydate

SELECT CAST('2023-05-07 12:34:56' AS datetime) As Todaydate

string date_and_time = "04/29/23 01:29:55";
DateTime datetime;

using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();

    using (SqlCommand command = new SqlCommand("SELECT CONVERT(datetime, @date_and_time, 101)", connection))
    {
        command.Parameters.AddWithValue("@date_and_time", date_and_time);

        using (SqlDataReader reader = command.ExecuteReader())
        {
            if (reader.Read())
            {
                datetime = reader.GetDateTime(0);
            }
        }
    }
}

also like this

Declare @date_and_time varchar(100)= '04/29/23 01:29:55'
select Cast(@date_and_time as datetime)

You can use the `CONVERT` function in SQL Server to convert the string to a datetime data type. Here's an example:

```
DECLARE @date_and_time varchar(100) = '04/29/23 01:29:55'
DECLARE @datetime datetime

SET @datetime = CONVERT(datetime, @date_and_time, 101)

SELECT @datetime
```

In this example, the third parameter of the `CONVERT` function, which is set to 101, specifies the style of the input date string. Style 101 represents the format `mm/dd/yyyy`. The converted datetime value can then be assigned to a datetime variable or used in a query.