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private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
{
if (dateTimePicker1.Value.Hour > 6)
{
dateTimePicker1.CustomFormat = "'PM' yyyy-MM-dd hh:mm:ss";
}
else
{
dateTimePicker1.CustomFormat = "'TM' yyyy-MM-dd hh:mm:ss";
}
}