"JS Note" 5.3 Date type 5.4 regexp type

Information stored in Date type: Number of milliseconds since UTC (January 1, 1970 0 o'clock)

To create a Date object:

Using the constructor date ()

A Date object that represents the current number of milliseconds: var now = new Date ();//no parameter Shime the current number of milliseconds

A Date object that represents the specified number of milliseconds: var date1 = new Date (milliseconds);

To obtain the milliseconds method:

Method One: Date.parse (datestring);//datestring is a string representing the local time

The Date.parse () method returns the number of milliseconds that the string corresponds to, or Nan if the string cannot represent the date.

Common strings:

• Month/day/year: 6/18/2004
• Month name Day, year: January 12,2004
• Day of the week abbreviation month: minute: Second time zone: Tue May 2004 00:00:00 GMT-0700 (Beijing time is gmt+0800)
• ECMAScript 5 Standard: yyyy-mm-ddthh:mm:ss.sssz:2013-10-30t00:00:00+0800

Date.parse () Simple usage: var somedate = new Date ("January 12,2004");//Background call Date.parse ()

Method Two: DATE.UTC (year, month (based on 0) [, day = 1, time = 0, min = 0, sec =0, msec =0]);//Parameter is GMT time, not local time

Simple method: var allfives = new Date (2005, 4, 5, 17, 55, 55);//Direct parameter to constructor date (), the argument is local time! The sentence returns local time May 5, 2005 5:55:55

Date Object String method

Returns the local time string:

toLocaleString ()

ToString ()

toDateString ()

toTimeString ()

toLocaleDateString ()

toLocaleTimeString ()

Returns the UTC time String:

toUTCString ()

Read, set DateTime method

Number of milliseconds to read:

Date.now (): Read the number of milliseconds in the moment

ECMAScript 5 Support Browser: Ie9+,firefox 3+,safari3+,opera10.5,chrome

Common applications: Calculate code run time

var start = Date.now ();

DoSomething ();

var stop = Date.now (),

result = Stop-start;

Other browsers:

var start = +new Date ();

DoSomething ();

var stop = +new Date (),

result = Stop-start;

Note: Use unary operator "+" for non-numeric values

Use number () to convert the value:

• False=>0 true=>1
• String: Converting by a set of rules
• Object: Call valueof () if not, call ToString ()

GetTime (): reads the number of milliseconds for a Date object

ValueOf (): reads the number of milliseconds for a Date object

Common applications: Use > < >= <= to compare the size of a Date object (background call valueof ())

var date1 = new Date (2007,0,1);

var date2 = new Date (2007,1,1);

Alert (Date1 < date2);//true

Alert (date1> date2);//false

• Call valueof () if not, call ToString ()

Set Date object milliseconds: SetTime ()

Four-digit year: getFullYear () setfullyear () getUTCFullYear () setUTCFullYear ()

Month: Month (0-11)//DATE.UTC () method is also the monthly parameter 0--11

Date: Date (1-31)

Day of the Week: Day (0-6,0 is Sunday, only get method)

Time: Hour (0--23)

Points: Minutes

Seconds: Seconds

MS: Milliseconds

Time zone skew minutes (UTC time-local time = minutes): getTimezoneOffset ()

"JS Note" 5.3 Date type 5.4 regexp type