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karlc12137324
Participant
November 7, 2019
Question

Subtract multiple various days from date input by user

  • November 7, 2019
  • 1 reply
  • 2419 views

So, as ignorant and ineperienced as I am, I spent the last three days browsing these topics and still have to clue how to calculate (and display) a date into one field that is 180 days from a date that is input by the user.

 

I've read a ton about the 'get' function and can't even get a wrong date to display in my results field.

 

When I click on the suggested "Read everything on this page" links it does nothing for me. I'm totally ignorant...

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1 reply

try67
Community Expert
try67Community Expert
Community Expert
November 7, 2019

Have you seen these tutorials? They're a good starting point to learning how to work with Date objects in Acrobat (which is not a simple task):

https://acrobatusers.com/tutorials/working-with-date-and-time-in-acrobat-javascript
https://acrobatusers.com/tutorials/working-with-date-and-time-in-acrobat-javascript-part-2
https://acrobatusers.com/tutorials/working-date-and-time-acrobat-javascript-part-3-3

 

If you're interested in an easy way of doing it I can recommend my own (paid-for) tool that allows you to quickly set up such calculations, without having to write any code at all. You can find it here: http://try67.blogspot.com/2012/01/acrobat-apply-automatic-date.html

    K
    karlc12137324Author
    Participant
    November 7, 2019

    Yep, been over that. It's all greek to me, but if I can't figure it out I might be lost!

     

    I'll get back at it

    Thom Parker
    Community Expert
    Thom ParkerCommunity Expert
    Community Expert
    November 7, 2019

    Date calculations are tricky because dates are not single valued entities. Actually though, they are. It's just that we view dates and times in a complicated way, using day, month, and year values. The idea behind any date calculation is to convert the date representation into a single number, then add or subtract a quantity, and finally convert it back to the date representation. The conversions are pretty complicated, but we don't have to worry about it because JavaScript provides us with conversion functions, util.scand and util.printd.

     

    You're calculation script should be something like this.

     

    var dateIn = util.scand("...", getField("Date").value);

    var newTime = dateIn.getTime() + value180days;

    event.value =   util.printd("...", new Date(newTime));

     

    All you need to do is fill in the "..." bits and calculate "value180days"

     

     

    Thom Parker - Software Developer at PDFScriptingUse the Acrobat JavaScript Reference early and often
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