The
Date object is used to work with dates and
times.
Examples
Date
Returns today's
date including date, month, and year. Note that the
getMonth method returns 0 in January, 1 in February etc.
So add 1 to the getMonth method to display the correct
date.
Time
Returns the current
local time including hour, minutes, and seconds. To
return the GMT time use getUTCHours, getUTCMinutes
etc.
Set date
You can also
set the date or time into the date object, with the
setDate, setHour etc. Note that in this example, only
the FullYear is set.
UTC time
The getUTCDate
method returns the Universal Coordinated Time which is
the time set by the World Time Standard.
Display weekday
A simple
script that allows you to write the name of the current
day instead of the number. Note that the array object is
used to store the names, and that Sunday=0, Monday=1
etc.
Display full date
How to
write a complete date with the name of the day and the
name of the month.
Display time
How to
display the time on your pages. Note that this script is
similar to the Time example above, only this script
writes the time in an input field. And it continues
writing the time one time per second.
The Date
object
The Date object is used to
work with dates and times.
You create an instance of
the Date object with the "new" keyword.
To store the current date
in a variable called "my_date":
After creating an instance
of the Date object, you can access all the methods of
the object from the "my_date" variable. If, for example,
you want to return the date (from 1-31) of a Date
object, you should write the following:
You can also write a date
inside the parentheses of the Date() object, like
this:
new Date("Month dd, yyyy hh:mm:ss")
new Date("Month dd, yyyy")
new Date(yy,mm,dd,hh,mm,ss)
new Date(yy,mm,dd)
new Date(milliseconds) |
Here is how you can create
a Date object for each of the ways above:
var my_date=new Date("October 12, 1988 13:14:00")
var my_date=new Date("October 12, 1988")
var my_date=new Date(88,09,12,13,14,00)
var my_date=new Date(88,09,12)
var my_date=new Date(500) |
The Most
Common Methods
NN: Netscape, IE: Internet
Explorer, ECMA: Web Standard
Methods |
Explanation |
NN |
IE |
ECMA |
| Date() |
Returns a
Date object |
2.0 |
3.0 |
1.0 |
| getDate() |
Returns
the date of a Date object (from 1-31) |
2.0 |
3.0 |
1.0 |
| getDay() |
Returns
the day of a Date object (from 0-6. 0=Sunday,
1=Monday, etc.) |
2.0 |
3.0 |
1.0 |
| getMonth() |
Returns
the month of a Date object (from 0-11. 0=January,
1=February, etc.) |
2.0 |
3.0 |
1.0 |
| getFullYear() |
Returns
the year of the Date object (four
digits) |
4.0 |
4.0 |
1.0 |
| getHours() |
Returns
the hour of the Date object (from 0-23) |
2.0 |
3.0 |
1.0 |
| getMinutes() |
Returns
the minute of the Date object (from
0-59) |
2.0 |
3.0 |
1.0 |
| getSeconds() |
Returns
the second of the Date object (from
0-59) |
2.0 |
3.0 |
1.0 |
The
built-in Math object includes mathematical constants and
functions.
The Math
object
The built-in Math object
includes mathematical constants and functions. You do
not need to create the Math object before using
it.
To store a random number
between 0 and 1 in a variable called
"r_number":
To store the rounded number
of 8.6 in a variable called "r_number":
The Most
Common Methods
NN: Netscape,
IE: Internet Explorer, ECMA: Web
Standard
Methods |
Explanation |
NN |
IE |
ECMA |
| max(x,y) |
Returns the number with the highest value
of x and y |
2.0 |
3.0 |
1.0 |
| min(x,y) |
Returns the number with the lowest value of
x and y |
2.0 |
3.0 |
1.0 |
| random() |
Returns a random number between 0 and
1 |
2.0 |
3.0 |
1.0 |
| round(x) |
Rounds x to the nearest integer |
2.0 |
3.0 |
1.0 |
|
|
