By default, a digital signature contains a date and time. The digitally-authorized time stamp indicates the contents of the document existed at that time and have not been changed since then. You can configure a new time stamp authority and add it to the list of time stamp servers. The time stamp will show on the Date/Time tab in the Signature Properties dialog box. Otherwise, the current date and time of your computer will be used instead.

Set up time stamp servers

  1. Open a PDF and choose Security > Digital IDs and Certificates > Manage Digital Identities.

  2. In the Security Settings dialog box, select Time Stamp Server in the left-side window and then click Add….

  3. In the Add Time Stamp Server dialog box, name the time stamp authority and enter its URL. Check The server requires you to log in if needed and then enter the user name and password. Click OK.

Add a document timestamp

  1. Open a PDF you want to add a timestamp to and choose Security > Sign/Certify > Time Stamp Document.

  2. In the Time Stamp Service dialog box, select an existing time stamp service from the list and click If there isn’t any existing one, click Add to add a new time stamp server.

  3. In the Save as dialog box, choose a location to save the document with the timestamp and click Save.

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