Determining age using Javascript within Adobe Acrobat

Question

Determining age using Javascript within Adobe Acrobat

I've encountered a challenge trying to populate a field in an interactive PDF form. I am utilizing JavaScript to calculate the current age of a client by subtracting two date fields (DateToday and ClientDOB) already present in the form, and then aiming to have it display in a "ClientAge" field. The DateToday field is set to auto-populate when the form is opened. My goal is for the ClientAge field to populate once the user selects a value for ClientDOB.

My desired calculation is as follows, which seems straightforward:

DateToday - ClientDOB = ClientAge

Below is the code I'm using:

var DateToday_ = Date2Num(DateToday.formattedValue, "MM/DD/YYYY")
var ClientDOB_ = Date2Num(ClientDOB.formattedValue, "MM/DD/YYYY")
var diff = DateToday_ - ClientDOB_
ClientAge.value = Floor(diff / 365.25)

I'm puzzled as to why the ClientAge field isn't populating after selecting ClientDOB. Any insights or assistance would be greatly appreciated. Thank you.

javascript forms pdf adobe

Answer 1

Answer №1

This piece of code was sourced from the internet, although the exact origin is unknown. Despite this uncertainty, I have utilized it in various scenarios and found it to be effective. The concept behind it is that the variance between dates is measured in milliseconds, with a specific date representing the number of seconds elapsed since a predetermined date in the past. By determining the difference in seconds between two dates (such as Date of Birth to the present), one can calculate the corresponding number of years. It should be noted that the date format used here is in British style (dd/mm/yy), so adjustments will need to be made for those operating in American format (mm/dd/yy).

// obtain current date IN THIS NON-AMERICAN FORMAT
var oNow = new Date();
// fetch date from 'Demo.DOB' input field
var oMyDate = util.scand('dd/mm/yy', this.getField('Demo.DOB').value);
// define a second in milliseconds
var nSec = 1000;
// define a minute in milliseconds
var nMin = 60 * nSec;
// define an hour in milliseconds
var nHr = 60 * nMin;
// define a day in milliseconds
var nDay = 24 * nHr;
// calculate today's date as the number of days from the epoch date
var nNowDays = Number(oNow) / nDay;
// round down to whole days
nNowDays = Math.floor(nNowDays);
// calculate the inputted date in days from the epoch date
var nMyDateDays = Number(oMyDate) / nDay;
// round down to whole days
nMyDateDays = Math.floor(nMyDateDays);
// determine the difference in the number of days
var nDiffDays = nNowDays - nMyDateDays;
// adjust the difference to account for counting the starting day as 1
++nDiffDays;
// convert days to years
var nYears = nDiffDays / 365.2525
// round down to whole years
nYears = Math.floor(nYears);
// set the value of the field to the calculated number of years (nYears)
event.value = nYears;

Answer 2

This piece of code was sourced from the internet, although the exact origin is unknown. Despite this uncertainty, I have utilized it in various scenarios and found it to be effective. The concept behind it is that the variance between dates is measured in milliseconds, with a specific date representing the number of seconds elapsed since a predetermined date in the past. By determining the difference in seconds between two dates (such as Date of Birth to the present), one can calculate the corresponding number of years. It should be noted that the date format used here is in British style (dd/mm/yy), so adjustments will need to be made for those operating in American format (mm/dd/yy).

// obtain current date IN THIS NON-AMERICAN FORMAT
var oNow = new Date();
// fetch date from 'Demo.DOB' input field
var oMyDate = util.scand('dd/mm/yy', this.getField('Demo.DOB').value);
// define a second in milliseconds
var nSec = 1000;
// define a minute in milliseconds
var nMin = 60 * nSec;
// define an hour in milliseconds
var nHr = 60 * nMin;
// define a day in milliseconds
var nDay = 24 * nHr;
// calculate today's date as the number of days from the epoch date
var nNowDays = Number(oNow) / nDay;
// round down to whole days
nNowDays = Math.floor(nNowDays);
// calculate the inputted date in days from the epoch date
var nMyDateDays = Number(oMyDate) / nDay;
// round down to whole days
nMyDateDays = Math.floor(nMyDateDays);
// determine the difference in the number of days
var nDiffDays = nNowDays - nMyDateDays;
// adjust the difference to account for counting the starting day as 1
++nDiffDays;
// convert days to years
var nYears = nDiffDays / 365.2525
// round down to whole years
nYears = Math.floor(nYears);
// set the value of the field to the calculated number of years (nYears)
event.value = nYears;

Determining age using Javascript within Adobe Acrobat

Answer №1

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