If a simple date is typed as text from the keyboard, it is not going to update any more than if you were to type in this sentence, it would update. If your date is updating, you have inserted a date field. Right click and toggle the field to view the field.
A CREATEDATE field reflects the date the document was created (or saved using SAVEAS). You can insert it as many times as you require in a document and it will always display that date. The problem highlighted with CREATEDATE is that the document is saved using SAVINGAS with a different name. The date you do that then becomes the new CREATEDATE.
You cannot stop a date field from updating. It will update to reflect the system date of the computer when the document is opened and you cannot undo that change. You can change that DATE field to a CREATEDATE field but there is no guarantee that the date thus produced was the intended date.
As long as documents are renamed the CREATEDATE will be an issue. Just make sure that it isn't an issue for others in your documents, by inserting the dates as text and not as fields.
If you are using a template which has lots of Date fields, then unlink them before saving the document for the last time. You can do that with a macro
http://www.gmayor.com/installing_macro.htm e.g.
Code:
Option Explicit
Sub UnlinkAllDateFields()
Dim oStory As Range
Dim oFld As Field
For Each oStory In ActiveDocument.StoryRanges
For Each oFld In oStory.Fields
If oFld.Type = wdFieldDate Or oFld.Type = wdFieldDate Then
oFld.Unlink
End If
Next oFld
If oStory.StoryType <> wdMainTextStory Then
While Not (oStory.NextStoryRange Is Nothing)
Set oStory = oStory.NextStoryRange
For Each oFld In oStory.Fields
If oFld.Type = wdFieldDate Or oFld.Type = wdFieldDate Then
oFld.Unlink
End If
Next oFld
Wend
End If
Next oStory
Set oStory = Nothing
lbl_Exit:
Exit Sub
End Sub
You may also find
http://www.gmayor.com/FutureDateAddIn.htm useful?