Java Reference
In-Depth Information
Date, Time, and Timers
What You Will learn in this Chapter:
➤
Retrieving specific date and time information from a Date object
➤
Modifying the date and time of a Date object
➤
Delaying the execution of a function
➤
Executing a function at a set interval of time
Chapter 5 discussed that the concepts of date and time are embodied in JavaScript through the
Date
object. You looked at some of the properties and methods of the
Date
object, including
the following:
➤
The methods
getDate()
,
getDay()
,
getMonth()
, and
getFullYear()
enable you to
retrieve date values from inside a
Date
object.
➤
The
setDate()
,
setMonth()
, and
setFullYear()
methods enable you to set the date
values of an existing
Date
object.
➤
The
getHours()
,
getMinutes()
,
getSeconds()
, and
getMilliseconds()
methods
retrieve the time values in a
Date
object.
➤
The
setHours()
,
setMinutes()
,
setSeconds()
, and
setMilliseconds()
methods
enable you to set the time values of an existing
Date
object.
One thing not covered in that chapter is the idea that the time depends on your location
around the world. In this chapter you correct that omission by looking at date and time in
relation to
world time
.
For example, imagine you have a chat room on your website and want to organize a chat
for a certain date and time. Simply stating 15:30 is not good enough if your website attracts
international visitors. The time 15:30 could be Eastern Standard Time, Pacific Standard Time,