How to Calculate a Date 14 Days After a Digital Signature in PDF
Question details
The user wants to automatically calculate and populate an Effective Date field exactly 14 days after a digital signature is applied to a PDF document.
- Product
- Device & OS
- not provided
- Scenario
- Creating an interactive PDF form that requires a delayed effective date based on the final approval or digital signature date.
- Observed behavior
- Needs a method to trigger a date calculation dynamically so the field remains empty until the document is actually signed.
Ensure your PDF editing software supports form field JavaScript actions and that your document contains both a digital signature field and a separate text field for the effective date.
Add a JavaScript Action to the Signed Event
This method uses a simple JavaScript snippet triggered when the document is signed to calculate the future date and populate the target field.
By utilizing the 'Signed' event built into digital signature fields, you can execute custom scripts the moment a user applies their certificate. This ensures the 14-day calculation only happens upon final approval.
Open your PDF and enter the form editing or preparation mode to access field properties.
Right-click on your digital signature field and select 'Properties' from the context menu.
Go to the 'Signed' tab in the Properties dialog box. This tab handles actions that occur upon applying a signature.
Choose 'Run a JavaScript' as the action. Input the script that gets the current date, adds 14 days to it, and assigns this new date to the Effective Date text field.
Close the properties window, save your PDF, and test the signature field to ensure the effective date populates correctly.
Edit and Sign PDFs Seamlessly with WPS Office
WPS PDF provides comprehensive tools to create interactive forms, add digital signatures, and manage document approvals securely and efficiently.
- 1. Open PDF in WPS: Launch WPS Office and open your PDF document in the WPS PDF editor.
- 2. Enter Form Mode: Navigate to the 'Form' tab to add or edit text fields and digital signature boxes.
- 3. Apply Signatures: Use the 'Protect' or 'Fill & Sign' features to manage and apply digital signatures securely.
Frequently Asked Questions
Can I hide the Effective Date field until the document is signed?
Yes. You can set the Effective Date field's initial visibility to 'Hidden' in its properties. Then, add a line to your Signed event JavaScript to change the visibility to 'Visible' when the date is calculated.
What happens if the signature is cleared or removed?
If a digital signature is cleared, any data populated via the Signed event will typically remain unless you add a specific script or action to reset the Effective Date field when the signature is removed.
Does this work on mobile PDF readers?
Most mobile PDF readers do not support advanced JavaScript for form fields or digital signature events. It is recommended that users sign and process these specific forms on a desktop PDF application.
