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POWeird bug when inserting DateTime to sql server 2008
 

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  1. POWeird bug when inserting DateTime to sql server 2008
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    <p>I'm inserting a datetime field to sql server. From my local computer it works just fine. example: the datetime field in sql server is : "2013-07-31 08:00:00.000", but when I run the application form the server it switches the day and month and insert it like this: "2013-07-31 15:15:00.000".</p> <p>My relevant page loads some entries from the sql server depending on today's date. Like this:</p> <pre><code>public List&lt;act_event&gt; return_event_list(DateTime date) //return all events for spesific date { List&lt;act_event&gt; event_list = new List&lt;act_event&gt;(); String date_sql = date.ToString("yyyy-MM-dd"); using (SqlConnection con = connect("igroup20_test2ConnectionString")) { using (SqlCommand cmd = create_command(con, "select * from act_events where '" + date_sql + "'&gt;=(CAST(e_start as DATE)) and '" + date_sql + "'&lt;=(CAST(e_end as DATE))")) { using (SqlDataReader rdr = cmd.ExecuteReader()) { while (rdr.Read()) { act_event a_event = new act_event(); a_event.e_num = Convert.ToInt32(rdr["e_num"]); a_event.name = rdr["e_name"].ToString(); a_event.start = Convert.ToDateTime(rdr["e_start"]); a_event.end = Convert.ToDateTime(rdr["e_end"]); a_event.description = rdr["e_description"].ToString(); a_event.address = rdr["e_address"].ToString(); event_list.Add(a_event); } } } } return event_list; } </code></pre> <p><strong>This is how I insert the datetime fields:</strong></p> <pre><code>public void add_event(act_event add_avent) { using (SqlConnection con = connect("igroup20_test2ConnectionString")) { using (SqlCommand cmd = create_command(con, "insert into act_events values(@e_name, @e_start, @e_end, @e_description, @e_address)")) { cmd.Parameters.AddWithValue("@e_name", add_avent.name); SqlParameter param2 = new SqlParameter("@e_start", SqlDbType.DateTime); param2.Value = add_avent.start; cmd.Parameters.Add(param2); SqlParameter param3 = new SqlParameter("@e_end", SqlDbType.DateTime); param3.Value = add_avent.end; cmd.Parameters.Add(param3); //cmd.Parameters.Add(new SqlParameter("@e_start", SqlDbType.DateTime)); //cmd.Parameters["@e_start"].Value = DateTime.Parse(add_avent.start.ToString()); //cmd.Parameters.Add(new SqlParameter("@e_end", SqlDbType.DateTime)); //cmd.Parameters["@e_end"].Value = DateTime.Parse(add_avent.end.ToString()); cmd.Parameters.AddWithValue("@e_description", add_avent.description); cmd.Parameters.AddWithValue("@e_address", add_avent.address); cmd.ExecuteNonQuery(); } //using (SqlCommand cmd2=create_command } } </code></pre> <p><strong>I tried changing the select command, adding this:</strong></p> <pre><code>using (SqlCommand cmd = create_command(con, "select * from act_events where ( '" + date_sql + "'&gt;=(CAST(e_start as DATE)) and '" + date_sql + "'&lt;=(CAST(e_end as DATE)) ) or ( '" + date_sql2 + "'&gt;=(CAST(e_start as DATE)) and '" + date_sql2 + "'&lt;=(CAST(e_end as DATE)) ) ")) </code></pre> <p>but for some of the dates it gives me an error:</p> <blockquote> <p>Conversion failed when converting date and/or time from character string.</p> </blockquote> <p>What should I do?</p> <p><strong>EDIT:</strong></p> <p>I tried to run the query from the sql studio itself like this:</p> <pre><code>select * from act_events where ( '2013-08-03'&gt;=(CAST(e_start as DATE)) and '2013-08-03'&lt;=(CAST(e_end as DATE)) ) or ( '2013-03-08'&gt;=(CAST(e_start as DATE)) and '2013-03-08'&lt;=(CAST(e_end as DATE)) ) </code></pre> <p>it gives me:</p> <p><img src="https://i.stack.imgur.com/Gc7uU.jpg" alt="enter image description here"></p> <p>But if I run it like this: (different date)</p> <pre><code>select * from act_events where ( '2013-07-30'&gt;=(CAST(e_start as DATE)) and '2013-07-30'&lt;=(CAST(e_end as DATE)) ) or ( '2013-30-07'&gt;=(CAST(e_start as DATE)) and '2013-30-07'&lt;=(CAST(e_end as DATE)) ) </code></pre> <p>it gives me this error:</p> <p><img src="https://i.stack.imgur.com/JtXjA.jpg" alt="enter image description here"></p> <p><strong>EDIT2:</strong></p> <p><strong>After James suggestion I made a parameterized query like this:</strong></p> <pre><code>String date_sql = date.ToString("yyyy-MM-dd"); String date_sql2 = date.ToString("yyyy-dd-MM"); using (SqlConnection con = connect("igroup20_test2ConnectionString")) { using (SqlCommand cmd = create_command(con, "select * from act_events where @date1&gt;=(CAST(e_start as DATE)) and @date2&lt;=(CAST(e_end as DATE))")) { cmd.Parameters.AddWithValue("@date1", date_sql); cmd.Parameters.AddWithValue("@date2", date_sql); cmd.Parameters.AddWithValue("@date3", date_sql2); cmd.Parameters.AddWithValue("@date4", date_sql2); </code></pre> <p>which still won't load the correct entries from the sql server</p> <p><strong>Then I tried this query:</strong></p> <pre><code>String date_sql = date.ToString("yyyy-MM-dd"); String date_sql2 = date.ToString("yyyy-dd-MM"); using (SqlConnection con = connect("igroup20_test2ConnectionString")) { using (SqlCommand cmd = create_command(con, "select * from act_events where ( @date1&gt;=(CAST(e_start as DATE)) and @date2&lt;=(CAST(e_end as DATE)) ) or ( @date3&gt;=(CAST(e_start as DATE)) and @date4&lt;=(CAST(e_end as DATE)) )")) { cmd.Parameters.AddWithValue("@date1", date_sql); cmd.Parameters.AddWithValue("@date2", date_sql); cmd.Parameters.AddWithValue("@date3", date_sql2); cmd.Parameters.AddWithValue("@date4", date_sql2); </code></pre> <p>And again it just give me:</p> <pre><code>Conversion failed when converting date and/or time from character string. </code></pre>
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    1. CO`yyyy-MM-dd` is an amiguous format with `datetime` (but not for `date`). It is interpreted according to the default language of the login. `yyyyMMdd` is unamiguous.
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