Hi,
Create a new, empty form in design view. Click the crossed tools (More
Controls) that is in your toolbox and find the Calendar Control in your extra
controls. Your cursor should turn into a cross with a little hammer beside
it. Draw a box the size of the calendar you want on the form. Your
calendar should start automatically.
Enter the following code into the Double Click Event Procedure of your VB
Code.
Private Sub actlCalendar_DblClick()
Dim dtmDate As Date
'To set the date control to date selected on the calendar
dtmDate = Me.ActiveControl.Value
DoCmd.Close acForm, Me.Name 'Closes form once value is selected
Screen.ActiveControl.Value = dtmDate
End Sub
Then (we're getting close to the end...

)
create a text box on the form that you wish to have the calendar pop up on
and place this code in the double click event procedure
Private Sub TxtEndDate_DblClick(Cancel As Integer)
DoCmd.OpenForm "frmCalendar"
End Sub
Run your form, and hopefully, double clicking inside your text box will
start the Calendar form. Double click the desired date which will then enter
that date into your text box.
Hope it works out for you...