Multidimensional Arrays
The array examples I have
shown so far deal with single-dimensional arrays. That is, there is a single
value associated with each index of the array. Some languages allow you to
create multi-dimensional array as a database table with multiple fields (Coloumns).
Javascript does not provide
explicit support for multi-dimesional arrays, but you can simulate them by
creating an array of custom objects.
Date Object
The Date Object is the means
by which you work with date and time values in javascript. You should
understand three significant facts regarding the Date object before using it:
]
Following the UNIX convention, Javascript considers January
1,1970 to be the baseline date. Consequently , you cannot work with dates prior
to that time frame.
]
When you create a Date Object , the time reflected
within the object is based on the client machine. You are thus dependent on the
client computer to have a working and accurate clock. Keep this dependency in
mind as you consider time-sensitive code in your Javascript scripts.
Creating a Date Object
Creating a Date object is similar to creating string or array objects.
You can create as many Date objects as you want in your scripts. Using the new
operator, you can define a Date Object as follows:
Var dateVariable=new Date([parameter])
You can include several parameters.
|
Method |
Description |
|
getDate() |
Returns date within month(1-31) |
|
getDay() |
Returns day within week(0-6) |
|
getHours() |
Returns hour within day(0-23) |
|
getMinutes() |
Returns minutes within hour(0-59) |
|
getSeconds() |
Returns seconds within minutes |
|
getTime() |
Returns number of milliseconds |
|
getYear() |
Returns number of years since 1900 |
|
getTimeZoneOffset() |
Returns minutes offset from GMT/UTC |
|
getMonth() |
Returns month within year |
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Date object</title>
</head>
<body style="background-color: aquamarine;">
<h1>Date object</h1>
<hr>
<script>
document.write("<b>");
dt=new Date();
document.write(dt);
document.write("<br/>");
document.write("<br/>");
document.write("Date within
month:"+dt.getDate());
document.write("<br/>");
document.write("<br/>");
document.write("Day within
week:"+dt.getDay());
document.write("<br/>");
document.write("<br/>");
document.write("Month within
year:"+dt.getMonth());
document.write("<br/>");
document.write("<br/>");
document.write("Number of year
since 1900:"+dt.getYear());
document.write("<br/>");
document.write("<br/>");
document.write("Hour within
day:"+dt.getHours());
document.write("<br/>");
document.write("<br/>");
document.write("Minutes within
hour:"+dt.getMinutes());
document.write("<br/>");
document.write("<br/>");
document.write("Seconds within
minutes :"+dt.getSeconds());
document.write("<br/>");
document.write("Number of
milliseconds since 1/1/70:"+dt.getTime());
document.write("<br/>");
document.write("<br/>");
</script>
</hr>
</body>
</html>
Output
Set methods of
the Date object
|
Method |
Description |
|
setDate() |
Returns date within month(1-31) |
|
setDay() |
Returns day within week(0-6) |
|
setHours() |
Returns hour within day(0-23) |
|
setMinutes() |
Returns minutes within hour(0-59) |
|
setSeconds() |
Returns seconds within minutes |
|
setTime() |
Returns number of milliseconds |
|
setYear() |
Returns number of years since 1900 |
|
setTimeZoneOffset() |
Returns minutes offset from GMT/UTC |
|
setMonth() |
Returns month within year |
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Date Object</title>
</head>
<body style="background-color: tomato;">
<h1>Set Methos</h1>
<hr>
<script>
document.write("<b>");
dt=new Date();
document.write(dt);
dt.setDate(29);
dt.setHours(20);
dt.setMinutes(30);
dt.setMonth(11);
dt.setSeconds(50);
dt.setYear(2001);
document.write("<br/>");
document.write(dt);
document.write("</b>");
</script>
</hr>
</body>
</html>
Output
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