If you wish to Add Date to a PDF, a DocHub profile is all it takes.
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This tutorial provides steps on creating a custom date stamp or time stamp for docHub 10. Before starting, ensure that you have the custom stamp in either JPG or PDF format. The first code helps find the PDF file name for the custom stamp, while the second prompts the user for the date stamp. Write down both codes and save them in a text document. Open Acrobat and go to comment annotations, then select custom stamps to create your custom stamp using your chosen image.