Acrobat Comments Date Registration Form As

The Date object cant be used directly in a mathematical expression.

Dates and times, both separately and together are useful, if not absolutely necessary, for a variety of PDF-document applications.

The first, and probably the most common, use is for a date or time field on a form.

Examples include the date on which the form was filled out, birthday, expiration date, start andor end time, hours worked, days rented and so on.

All of these fields require an expression of time displayed as either a date or time string.

Adobe Acrobat provides several built-in date-and-time formatting options.

Acrobat Comments Date Registration Form As

They are great for displaying a datetime, but what do you do if you want to use a date or time in a calculation, such as figuring out a due date or a rental cost Or maybe you need to use the date to set various options on the form, such as changing the cost on a registration form as the event gets nearer.

So how do you work with dates and times programmatically in Acrobat Dates in JavaScript First, it is important to understand that Acrobat JavaScript is divided into two parts, the core JavaScript language, which is the same for JavaScript in any application, and the Acrobat Document Object Model (DOM), which handles access to AcrobatPDF specific functionality.

Dates and times are so generally useful that they are included as part of the core JavaScript language.

The Acrobat DOM helps us to use dates and times by providing some utility functions, but basic data and time manipulation is done with core JavaScript functionality so well start by looking at this functionality first.

The core JavaScript language handles dates and times with a single object, the Date object.

Internally this object represents a DateTime with the number of milliseconds from some arbitrary calendar date.

This object provides several functions for creating, accessing, printing, and manipulating dates and times.

In order to easily test and debug the codes several examples in this article will use the Acrobat JavaScript Console (a.k.a the console window).

Activate the JavaScript Console now to test out the following code.

Once the console window is open, enter the following JavaScript code: var rightNow new Date(); Place the cursor on the line (anywhere on the line will do as long as none of the text is selected) and press ControlEnter keys at the same time (CommandEnter for the Macintosh platform).

If your keyboard has a number pad you can use the Enter key on the number pad without pressing the Control(Command on Mac) key.

Now lets enter a line of code for displaying the DateTime value.

Enter the following code in the console window and execute it with ControlEnter: rightNow.toString(); Your console window should look similar to Figure 1 below.

Figure 1: Using the Console Window to create and display a Date Object Date objects are created with a special JavaScript function called a constructor.

Lets take another look at that line of code that creates the Date object.

The default constructor for the Date object creates an object that represents the current date and time, so its what we will always use to get this information.

The Date object also includes functions for converting the raw date value into a human-readable string.

Acrobat JavaScript includes a much better date-formatting function.

Acrobat Pdf For Mac Comments Date