Use the Date object in Dreamweaver to insert the current date in whatever format you prefer and to update that date.
Dreamweaver provides a convenient Date object, which inserts the current date in whatever format you prefer (with or without the time) and provides the option of updating that date whenever you save the file.
The dates and times shown in the Insert Date dialog box are not the current date, nor do they reflect the dates/times that a visitor sees when they display your site. They are examples only of the way you want to display this information.
If you have selected Update Automatically On Save, you can edit the date format after it has been inserted into the document by clicking on the formatted text and selecting Edit Date Format in the Property inspector.