How to Correctly Convert a C# DateTime to a SQL Server 'yyyy-MM-dd HH:mm:ss' Format?

Converting DateTime Format to SQL Format in C#

Formatting a C# DateTime variable to match the expected SQL Server date format ("yyyy-MM-dd HH:mm:ss") can be challenging. Here's a detailed explanation of your code and a working solution:

Original Code:

DateTime myDateTime = DateTime.Now;
string sqlFormattedDate = myDateTime.Date.ToString("yyyy-MM-dd HH:mm:ss");

The issue with this code is that myDateTime.Date only contains the date portion, while myDateTime also includes the time. To obtain a string with both the date and time in the desired format, you need to use myDateTime directly.

Revised Code with Concatenated Strings:

string sqlFormattedDate = myDateTime.Date.ToString("yyyy-MM-dd") + " " + myDateTime.TimeOfDay.ToString("HH:mm:ss");

This code splits the DateTime object into its date and time components and concatenates them into a string. However, this version will fail with a compile-time error because myDateTime.TimeOfDay is of type TimeSpan and does not have a ToString method that takes a format string.

To fix this, you can use the ToString() method of DateTime directly instead of splitting the date and time components:

Correct Solution:

DateTime myDateTime = DateTime.Now;
string sqlFormattedDate = myDateTime.ToString("yyyy-MM-dd HH:mm:ss.fff");

The ToString("yyyy-MM-dd HH:mm:ss.fff") format string specifies the desired SQL Server date format, including millisecond precision. This code should produce the correctly formatted string without any errors.

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