How Can I Override Default Date and Time Formatting in a DataGridView?

Customize date and time format in DataGridView

In Windows Forms applications, you can use the DefaultCellStyle attribute to customize the datetime format of a DataGridView column.

To override the default formatting based on system settings, follow these steps:

1. Set the dataGrid.Columns[<column_index>].DefaultCellStyle.Format</column_index> attribute to the desired format.

2. Choose an appropriate format string to define the datetime format:

   • "MM/dd/yyyy HH:mm:ss": Use the standard date and time format of the 24-hour clock.
   • "MM/dd/yyyy hh:mm:ss tt": Use 12-hour (AM/PM) date and time format.

For example, if you have a column showing the "Last Action" column with a value of System.DateTime, you can format it as "MM/dd/yyyy hh:mm:ss" using the following code:

dataGrid.Columns[2].DefaultCellStyle.Format = "MM/dd/yyyy hh:mm:ss";

Alternatively, if you prefer the 12-hour format with AM/PM notation, you can use the following code:

dataGrid.Columns[2].DefaultCellStyle.Format = "MM/dd/yyyy hh:mm:ss tt";

By implementing this format override, you can ensure that the "Last Action" column in the DataGridView is displayed in the desired format, regardless of your system locale.

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