JavaScript Tutorials - Herong's Tutorial Examples - 2.33, by Herong Yang
The "Date" Object Type - Managing Dates and Times
This section provides a quick description and a tutorial example script on the 'Date' built-in object type, which is used to create 'Date' objects.
The "Date" object type is a built-in object type to be used to create a "Date" object, representing a moment in time. It has the following main features:
Here is a tutorial example script showing some of those features:
// Date_Object_Type.js // Copyright (c) 2013 HerongYang.com. All Rights Reserved. // Creating a new Date object var myObject = new Date(2008, 0, 1, 2, 3, 4); // Checking this object println("\nAbout this \"myObject\":"); println(" Type = "+(typeof myObject)); println(" Instance Of Object: "+(myObject instanceof Object)); println(" Instance Of Date: "+(myObject instanceof Date)); // Using Number's inherited methods var v = myObject.valueOf(); var s = myObject.toString(); var h = myObject.getHours(); println("\nExecution result:"); println(" typeof myObject = "+(typeof myObject)); println(" typeof myObject.valueOf() = "+(typeof v)); println(" typeof myObject.toString() = "+(typeof s)); println(" typeof myObject.getHours(() = "+(typeof h)); println(" value of myObject.valueOf() = "+v); println(" value of myObject.toString() = "+s); println(" value of myObject.toString() = "+h); println("\nUsing methods of the Date constructor:"); var myTime = Date.parse("Tue Jan 01 2008"); var myDate = new Date(myTime); println(" typeof myTime = "+(typeof myTime)); println(" typeof myDate = "+(typeof myDate)); println(" myTime = "+myTime); println(" myDate.toString() = "+myDate.toString());
If you run this script with "jrunscript", you will get:
About this "myObject": Type = object Instance Of Object: true Instance Of Date: true Execution result: typeof myObject = object typeof myObject.valueOf() = number typeof myObject.toString() = string typeof myObject.getHours(() = number value of myObject.valueOf() = 1199170984000 value of myObject.toString() = Tue Jan 01 2008 02:03:04 GMT-0000 value of myObject.toString() = 2 Using methods of the Date constructor: typeof myTime = number typeof myDate = object myTime = 1199163600000 myDate.toString() = Tue Jan 01 2008 00:00:00 GMT-0000
Now we know how to create "Date" objects with the "Date()" constructor.
Read other "Date" related chapters to see more tutorial examples.
Table of Contents
ECMAScript Language Specification and JavaScript Dialects
Data Types, Variables and Expressions
Creating, Accessing, and Manipulating Arrays
Defining and Calling Functions
Web Browser Supporting JavaScript
Server-Side and Client-Side Web Scripting
Defining Your Own Object Types
Inheritance of Properties and Methods through the Prototype Object Chain
'jrunscript' - JavaScript Shell Command from JDK
Using Functions as "Function" Objects
►Introduction to Built-in Object Types
Overview of Built-in Object Types
The "Object" Object Type - The Root Object Type
The "Global" Object Type - The Invisible Global Container
Global Properties and Functions Defined in ECMAScript
Global Properties and Functions Provided by "jrunscript"
The "Function" Object Type - Functions Are Objects
The "Array" Object Type - Arrays Are Objects
The "JSON" Object Type - parse() and stringify()
The "String" Object Type - Not Equal to String Primitive Type
The "Boolean" Object Type - Wrapping Boolean Values into Objects
The "Number" Object Type - Not Equal to Number Primitive Type
►The "Date" Object Type - Managing Dates and Times
The "RegExp" Object Type - Regular Expression Patterns
The "Error" Object Type - Runtime Exceptions
The "Math" Object Type - The Math Container
W3C's Document Object Model (DOM) Specifications