How to Add or Subtract Days from a Date in Adobe Acrobat Forms
Question details
The user needs to configure an interactive PDF form to automatically calculate and display a new date by adding or subtracting a specific number of days from an input date.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Setting up form field calculations where an expiration date or future deadline (e.g., 180 days later) must be generated automatically based on a user's date entry.
- Observed behavior
- Acrobat requires properly parsed JavaScript Date objects and formatting (using util.scand and util.printd) to successfully compute and display the modified date.
Verify that the source text field is explicitly formatted as a Date field, and note the exact date format (e.g., 'mm/dd/yyyy') so you can match it precisely in your JavaScript code.
Use Custom JavaScript to Calculate the Date
Implement a custom calculation script in the destination field to parse the input, adjust the date, and format the output.
Because Adobe Acrobat does not provide a built-in pre-set for adding or subtracting days from a date, you must use Acrobat JavaScript. This involves converting the user's text string into a Date object, manipulating the time value, and printing it back into the destination field.
Open your PDF document in Adobe Acrobat, go to the Tools menu, and select 'Prepare Form' to view all interactive fields.
Right-click the text field where you want the calculated date to appear and select 'Properties'. Navigate to the 'Calculate' tab.
Select the 'Custom calculation script' radio button and click the 'Edit' button. Enter your JavaScript code. You will need to use 'util.scand()' to parse the source field's date, use the 'setDate()' method to add your desired number of days (e.g., +180), and use 'util.printd()' to format the final Date object for display.
Click 'OK' to save the script, close the properties dialog, and switch back to 'Preview' mode. Enter a date in the source field to verify the destination field updates correctly.
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Frequently Asked Questions
Why does my Acrobat date calculation script return an error?
This usually occurs if the date format specified in your 'util.scand()' JavaScript function does not perfectly match the format of the date string entered in the source field. Check both for exact matching, including case sensitivity.
Can I output the calculated date in a different format?
Yes. While you must read the source date using its specific format, you can use a completely different format string in the 'util.printd()' function to display the calculated date in your preferred style.
Is there a way to add days to a date in Acrobat without JavaScript?
No, standard Adobe Acrobat does not offer a no-code formula strictly for adding or subtracting days from a date. You must use JavaScript or install a third-party form calculation plugin.
