Summary of JavaScript time operations

Date object Introduction

JS has objects dedicated to date and time processing.

Date object attributes:

Attribute	Description	FF	IE
Constructor	Returns a reference to the date function that creates this object.	1	4
Prototype	Allows you to add attributes and methods to objects.	1	4

Date object method:

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

Get date and time

1. Get the current date and time of the system

var date= new Date();

2. Obtain the specified date Based on the date string.

Method 1: new date (mm/DD/YYYY)

var date= new Date("05/15/2013");

Method 2: New Date (MM-DD-YYYY)

var date= new Date("05-15-2013");

Method 3: new date (yyyy/mm/DD) (Note: new date (YYYY-MM-DD) This method does not work)

var date= new Date("2013/05/15");

Method 4: setfullyear (yyyy, mm, DD) (Note: The month ranges from 0 to 11. Therefore, to get February, set the month value to 04. )

var date= new Date();date.setFullYear(2013,04,15);

Addition and subtraction of dates

1. Increase or decrease the number of days. Use the getdate () + adddays Method

var date=new Date()date.setDate(date.getDate()+5)

Note: This method automatically handles changes in the month and year. (For example, if you add 30 days, it will be one month .)
This method can also directly add a function to the date object:

<script>var date=new Date()Date.prototype.addDays = function(days) {this.setDate(this.getDate()+days);} date.addDays(5);</script>

2. Increase or decrease the number of months. Use the getmonth () + addmonths Method

The processing method is similar to the number of days. The year change will also be automatically processed.

var date=new Date()date.setMonth(date.getMonth()+10);

3. Weekly and quarterly Processing

Weekly processing can be attributed to daily processing. Week * 7

Quarter processing can be returned to month processing at quarter * 3

Based on the above, you can add functions like adddate to date for unified processing.