I think you need to replace each occurence of the date in question by a 'date field'.
You can insert the date as a field that will update automatically every time you open the document. This can be particularly helpful when used in conjunction with templates or mail merge documents, as you never have to worry that the date is incorrect or spend time entering the date.
To insert a date field in your document, follow these steps:
1. Postion the cursor where you would like to place the field
2. From the Insert menu, select Field…
3. In the Field dialog box, select Date in the Field names: scroll box
4. In the Date formats: box, select the date format that best suits the context of your document
5. Click OK
The date field will be inserted in your document in the format you selected. Each time you open the document or use the F9 key to update fields, the date will be updated.
