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using System.Text;
using System.Windows.Forms;

namespace DatetimeColumnOfDgv
{
    public partial class Form1 : Form
    {
        private DataGridView dataGridView1 = new DataGridView();

        public Form1()
        {
            this.dataGridView1.Dock = DockStyle.Fill;
            this.Controls.Add(this.dataGridView1);
            this.Load += new EventHandler(Form1_Load);
            this.Text = "DataGridView calendar column demo";
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            CalendarColumn col = new CalendarColumn();
            col.SetDateTimeFormat("yyyy-MM-dd hh:mm:ss");
            this.dataGridView1.Columns.Add(col);
            this.dataGridView1.RowCount = 5;

            foreach (DataGridViewRow row in this.dataGridView1.Rows)
               row.Cells[0].Value = DateTime.Now;

        }

    }

}

using System.Windows.Forms;
using System.Collections.Generic;
using System.Text;

namespace DatetimeColumnOfDgv
{
    public class CalendarColumn : DataGridViewColumn
    {
        public static CalendarCell cc = new CalendarCell();

        public void SetDateTimeFormat(string value)
        {
            cc.SetDateTimeStyleFormat(value);
        }

        public CalendarColumn()  : base(cc){}

        public override DataGridViewCell CellTemplate
        {
            get
            {
                return base.CellTemplate;
            }
            set
            {
                // Ensure that the cell used for the template is a CalendarCell.
                if (value != null &&
                    !value.GetType().IsAssignableFrom(typeof(CalendarCell)))
                {
                    throw new InvalidCastException("Must be a CalendarCell");
                }

                base.CellTemplate = value;
            }
        }
    }

    public class CalendarCell : DataGridViewTextBoxCell
    {
        public void SetDateTimeStyleFormat(string value)
        {
            this.Style.Format = value;
        }

        public CalendarCell()  : base()
        {
            // Use the short date format.
            this.Style.Format = "d";
        }

        public override void InitializeEditingControl(int rowIndex, object
            initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
        {
            // Set the value of the editing control to the current cell value.
            base.InitializeEditingControl(rowIndex, initialFormattedValue,
                dataGridViewCellStyle);

            CalendarEditingControl ctl =
                DataGridView.EditingControl as CalendarEditingControl;

            ctl.Value = (DateTime)this.Value;
        }

        public override Type EditType
        {
            get
            {
                // Return the type of the editing contol that CalendarCell uses.
                return typeof(CalendarEditingControl);
            }
        }

        public override Type ValueType
        {
            get
            {
                // Return the type of the value that CalendarCell contains.
                return typeof(DateTime);
            }
        }

        public override object DefaultNewRowValue
        {
            get
            {
                // Use the current date and time as the default value.
                return DateTime.Now;
            }
        }
    }

    class CalendarEditingControl : DateTimePicker, IDataGridViewEditingControl
    {
        DataGridView dataGridView;
        private bool valueChanged = false;
        int rowIndex;

        public CalendarEditingControl()
        {
            this.Format = DateTimePickerFormat.Short;
        }

        // Implements the IDataGridViewEditingControl.EditingControlFormattedValue
        // property.
        public object EditingControlFormattedValue
        {
            get
            {
                return this.Value.ToShortDateString();
            }
            set
            {
                String newValue = value as String;
                if (newValue != null)
                {
                    this.Value = DateTime.Parse(newValue);
                }
            }
        }

        // Implements the
        // IDataGridViewEditingControl.GetEditingControlFormattedValue method.
        public object GetEditingControlFormattedValue( DataGridViewDataErrorContexts context )
        {
            return EditingControlFormattedValue;
        }

        // Implements the
        // IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
        public void ApplyCellStyleToEditingControl( DataGridViewCellStyle dataGridViewCellStyle )
        {
            this.Font = dataGridViewCellStyle.Font;
            this.CalendarForeColor = dataGridViewCellStyle.ForeColor;
            this.CalendarMonthBackground = dataGridViewCellStyle.BackColor; 
        }

        // Implements the IDataGridViewEditingControl.EditingControlRowIndex
        // property.
        public int EditingControlRowIndex
        {
            get
            {
                return rowIndex;
            }
            set
            {
                rowIndex = value;
            }
        }

        // Implements the IDataGridViewEditingControl.EditingControlWantsInputKey
        // method.
        public bool EditingControlWantsInputKey( Keys key, bool dataGridViewWantsInputKey )
        {
            // Let the DateTimePicker handle the keys listed.
            switch (key & Keys.KeyCode)
            {
                case Keys.Left:
                case Keys.Up:
                case Keys.Down:
                case Keys.Right:
                case Keys.Home:
                case Keys.End:
                case Keys.PageDown:
                case Keys.PageUp:
                    return true;
                default:
                    return false;
            }
        }

        // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
        // method.
        public void PrepareEditingControlForEdit(bool selectAll)
        {
            // No preparation needs to be done.
        }

        // Implements the IDataGridViewEditingControl
        // .RepositionEditingControlOnValueChange property.
        public bool RepositionEditingControlOnValueChange
        {
            get
            {
                return false;
            }
        }

        // Implements the IDataGridViewEditingControl
        // .EditingControlDataGridView property.
        public DataGridView EditingControlDataGridView
        {
            get
            {
                return dataGridView;
            }
            set
            {
                dataGridView = value;
            }
        }

        // Implements the IDataGridViewEditingControl
        // .EditingControlValueChanged property.
        public bool EditingControlValueChanged
        {
            get
            {
                return valueChanged;
            }
            set
            {
                valueChanged = value;
            }
        }

        // Implements the IDataGridViewEditingControl
        // .EditingPanelCursor property.
        public Cursor EditingPanelCursor
        {
            get
            {
                return base.Cursor;
            }
        }

        protected override void OnValueChanged(EventArgs eventargs)
        {
            // Notify the DataGridView that the contents of the cell
            // have changed.
            valueChanged = true;
            this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
            base.OnValueChanged(eventargs);
        }
    }
}