By default, Microsoft Word will format dates and days of the week automatically as you type them. If you enter "janu," for example, Word will give you the option to press "Enter" to enter the word "January." Another way to have a date automatically inserted into a document is by using a form field. These Word "formulas" will calculate the current date in a document based on the format and other options you select.
Place your cursor on the page where you want Word to calculate the date.
Go to the "Insert" menu and select "Field" in Word 2003. In Word 2007 or Word 2010, go to the "Insert" tab, click "Quick Parts" in the "Text" group and select "Field." The Field dialogue box will open.
Select "Date" in the Field Names box.
Choose a format in the "Date Formats" box. Select the "Preserve Formatting During Updates" check box.
Click "OK" to insert the date form field onto the document. Press "Alt" and "F9" to toggle between the form field and the date text in the Word document.