HTML Dom tutorial 47-javascript date object

HTML Dom tutorial 47-javascript date object

 

The date object is an internal data type of JavaScript.

The date object does not have any attribute that can be read and written directly. All accesses to the date and time values are executed through the method.

Access detailed information about the date object method from the following table.

1: date object Method

Method	Description	FF	N	IE
Date ()	Returns the date and time of the current day.	1	2	3
Getdate ()	Returns a day of a month from the date object (1 ~ 31)	1	2	3
Getday ()	Returns a day of the week from the date object (0 ~ 6)	1	2	3
Getmonth ()	Returns the month from the date object (0 ~ 11)	1	2	3
Getfullyear ()	Returns the year from the date object with four digits	1	4	4
Getyear ()	Returns the year from the date object with two or four digits.	1	2	3
Gethours ()	Returns the hour of the date object (0 ~ 23)	1	2	3
Getminutes ()	Returns the minute of the date object (0 ~ 59)	1	2	3
Getseconds ()	Returns the number of seconds of the date object (0 ~ 59 ))	1	2	3
Getmilliseconds ()	Returns the millisecond of the date object (0 ~ 999)	1	4	4
Gettime ()	Returns the number of milliseconds since January 1, January 1, 1970.	1	2	3
Gettimezoneoffset ()	Returns the minute difference (GMT) between the local time and Greenwich Mean Time)	1	2	3
Getutcdate ()	Returns the Day (1 ~ 31)	1	4	4
Getutcday ()	Returns the day of the week (0 ~ 6)	1	4	4
Getutcmonth ()	Returns the month (0 ~ 11)	1	4	4
Getutcfullyear ()	Returns the four-digit year from the date object based on the universal time.	1	4	4
Getutchours ()	Returns the hour of the date object based on the Universal Time (0 ~ 23)	1	4	4
Getutcminutes ()	Returns the minute of the date object based on the Universal Time (0 ~ 59)	1	4	4
Getutcseconds ()	Returns the second of the date object based on the Universal Time (0 ~ 59)	1	4	4
Getutcmilliseconds ()	Returns the millisecond of the date object based on the Universal Time (0 ~ 999)	1	4	4
Parse ()	Returns the number of milliseconds from midnight, January 1, January 1, 1970 to the specified date (string ).	1	2	3
Setdate ()	Set a day of the month in the date object (1 ~ 31 ))	1	2	3
Setmonth ()	Set the month (0 ~ 11 ))	1	2	3
Setfullyear ()	Set the year in the date object (four digits)	1	4	4
Setyear ()	Set the year (two or four digits) in the date object ).	1	2	3
Sethours ()	Set the hour in the date object (0 ~ 23)	1	2	3
Setminutes ()	Set the minute in the date object (0 ~ 59)	1	2	3
Setseconds ()	Set the second in the date object (0 ~ 59)	1	2	3
Setmilliseconds ()	Set the millisecond in the date object (0 ~ 999)	1	4	4
Settime ()	Calculate the date and time by adding or subtracting a specified number of milliseconds to or from midnight, January 1, January 1, 1970	1	2	3
Setutcdate ()	Set the day of the month in the date object according to the Universal Time (1 ~ 31)	1	4	4
Setutcmonth ()	Set the month in the date object according to the Universal Time (0 ~ 11)	1	4	4
Setutcfullyear ()	Set the year (four digits) in the date object based on the universal time)	1	4	4
Setutchours ()	Set the hour (0 ~ 23)	1	4	4
Setutcminutes ()	Set the minute (0 ~ 59)	1	4	4
Setutcseconds ()	Set the second in the date object according to the Universal Time (0 ~ 59)	1	4	4
Setutcmilliseconds ()	Set the millisecond S (0 ~ 999)	1	4	4
Tosource ()	Representing the objectSource code	1	4	-
Tostring ()	Converts a date object to a string.	1	2	4
Totimestring ()	Converts the time part of the date object to a string.	1	2	4
Todatestring ()	Converts the date part of the date object to a string.	1	2	4
Togmtstring ()	Converts a date object to a string based on Greenwich Mean Time.	1	2	3
Toutcstring ()	Converts a date object to a string based on the universal time.	1	4	4
Tolocalestring ()	Converts a date object to a string based on the local time format.	1	2	3
Tolocaletimestring ()	Converts the time part of the date object to a string based on the local time format.	1	2	3
Tolocaledatestring ()	Converts the date part of the date object to a string based on the local time format.	1	2	3
UTC ()	Obtain a date based on the universal time, and then return the number of milliseconds from midnight, January 1, January 1, 1970 to that date.	1	2	3
Valueof ()	Returns the original value of the date object.	1	2	4

2: date object attributes

Attribute	Description	FF	N	IE
Constructor	A reference to the function used to create an object	1	4	4
Prototype	Allows you to add attributes and methods to objects	1	3	4

 

3: getdate (), getmonth () method

The following example shows different time formats:

<HTML>
<Body>

<SCRIPT type = "text/JavaScript">

VaR d = new date ()
VaR day = D. getdate ()
VaR month = D. getmonth () + 1
VaR year = D. getfullyear ()

Document. Write (day + "." + month + "." + Year)
Document. Write ("<br/> ")
Document. Write (Year + "/" + month + "/" + Day)

</SCRIPT>

</Body>
</Html>

4: tolocalestring () method

In this example, we will convert a specific date to a string based on the local time:

 
<SCRIPT type = "text/JavaScript">

VaR born = new date ("July 21,198 3 01:15:00 ")
Document. Write (born. tolocalestring ())

</SCRIPT>
 

Output:

 
July 21, 1983 1:15:00
5: getday () method
 

The getday () method returns the number of a day of the week.

The following example creates an array to output the name of the week instead of a number:

 
<SCRIPT type = "text/JavaScript">

VaR d = new date ()

VaR weekday = new array (7)
Weekday [0] = "Sunday"
Weekday [1] = "Monday"
Weekday [2] = "Tuesday"
Weekday [3] = "Wednesday"
Weekday [4] = "Thursday"
Weekday [5] = "Friday"
Weekday [6] = "Saturday"

Document. Write ("Today it is" + weekday [D. getday ()])

</SCRIPT>
 

Output:

 
Today it is Wednesday