JavaScript Date format and this month's get

This article on-line collection reprint, feel very useful place, so stay (after all, knowledge by accumulating) ...

1 The primary use of the Date----to take a separate value

Date ()//------Returns the day and time. GetDate ()//---Returns one day in one months from the Date object (1 ~ 31). GetDay ()//----Returns the day of the week from the Date object (0 ~ 6). GetMonth ()//---Returns the month (0 ~ 11) from the Date object. getFullYear ()//returns the year as a four-digit number from a Date object. GetYear ()//----Please use the getFullYear () method instead. GetHours ()//---Returns the hour of the date object (0 ~ 23). Getminutes ()//-Returns the minute of the Date object (0 ~ 59). Getseconds ()//-returns the number of seconds (0 ~ 59) of the Date object. Getmilliseconds ()//returns the milliseconds of the date object (0 ~ 999). GetTime ()//-----Returns the number of milliseconds since January 1, 1970.

2 Primary use----assignment for Date

SetDate ()//-----Set the day of the month in the Date object (1 ~ 31). Setmonth ()//----Set the month (0 ~ 11) in the Date object. setFullYear ()//-sets the year (four digits) in the Date object. Setyear ()//-----Please use the setFullYear () method instead. Sethours ()//----Set the hour (0 ~ 23) in the Date object. Setminutes ()//--sets the minute (0 ~ 59) in the Date object. Setseconds ()//--sets the second (0 ~ 59) in the Date object. Setmilliseconds ()//sets the milliseconds (0 ~ 999) in the Date object. SetTime ()//------Set the Date object in milliseconds.

3 primary use of Date----formatting values

ToString ()//-----Converts the Date object to a string. It doesn't make much sense. totimestring ()//-converts the time portion of a Date object to a string. Standard format, not much meaning todatestring ()//-converts the date part of a Date object to a string. Standard format, not much meaning toutcstring ()//-converts a Date object to a string based on the universal. toLocaleString ()//Converts a Date object to a string based on the local time format. toLocaleTimeString ()//Converts the time portion of a Date object to a string based on the local time format. Of course, it is in the format, but not the custom format tolocaledatestring ()//based on the local time format, convert the date part of the dates object to a string. Of course, in the format, but not the custom format d.valueof ()//----return is the value of the definition, it does not make much sense, if you use the new Date () then return the number of milliseconds, equivalent to gettime ()

4 Date formatting functions, simple formatting

  Extension to date, convert  Date  to string   //  month (m), Day (d), hour (h), Minute (m), seconds (s), quarter (q) in the specified format   can use  1-2  placeholder,   //  year (y) to use  1-4  placeholders, milliseconds (S) can only be used with  1  placeholders (yes  1-3  Digit)    //  example:   //  (New date ()). Format ("Yyyy-mm-dd hh:mm:ss. S ")  ==> 2006-07-02 08:09:04.423   //  (New date ()). Format ("YYYY-M-D H:M:S.S")       ==> 2006-7-2 8:9:4.18    date.prototype.format = function (FMT) { //author: meizz      var o = {        "m+"  : this.getmonth () +1,                  //Month         "d+"  : this.getdate (),                     //Day         "H +"  : this.gethours (),                    //hours         "m+"  :  This.getminutes (),                  //points         "s+"  : this.getseconds (),                  //sec          "q+"  : math.floor ((This.getmonth () +3)/3),  //quarterly          "S"   : this.getmilliseconds ()               //Ms      };     if (/(y+)/.test (FMT))        fmt=fmt.replace (regexp.$1,  (this.getfullyear () + ""). substr (4 - regexp.$1.length));      for (Var k in o)        if (new  regexp ("(" + k + ")"). Test (FMT))               fmt = fmt.replace (regexp.$1,  (regexp.$1.length==1)  ?                       (o [K])  :  (("+ o[k"). substr (("" + o[k]). Length));  return fmt;    } //  Sample Code Var today = new date (). Format (' Yyyy-mm-dd hh:mm:ss. S '); Console.info (today);

5 Date Gets the last day of the first day of the month, the last day of the first day of the week

/** *  first day of the Week  */function showweekfirstday ()  {     var  Nowdate=new date ();      var weekfirstday=new date (Nowdate-( Nowdate.getday ()-1) *86400000);      return weekfirstday.format (' yyyy-MM-dd  Hh:mm:ss. S ')  } /**  *  last day of the Week   */ function showweeklastday ()  {      var nowdate=new date ();      var weekfirstday= New date (nowdate-(Nowdate.getday ()-1) *86400000);      var weeklastday=new  date ((weekfirstday/1000+6*86400) *1000);      return weeklastday.format (' Yyyy-mm-dd hh:mm:ss. S ')  } /**  *  first day of the Month   */ function showmonthfirstday ()  {      var nowdate=new date ();      var monthfirstday= NEw date (Nowdate.getfullyear (), Nowdate.getmonth (), 1);     return  Monthfirstday.format (' Yyyy-m-d hh:mm:ss. S ')  } /**  *  last day of the Month   */ function showmonthlastday ()  {      var nowdate=new date ();     var  Monthnextfirstday=new date (Nowdate.getfullyear (), Nowdate.getmonth () +1,1);      Var monthlastday=new date (MonthNextFirstDay-86400000);     return  Monthlastday.format (' Yyyy-mm-dd hh:mm:ss. S ')  }

Note: The 5th depends on the formatting of the 6th. Well, although these on-line search a lot of, but, oneself summed up again, always feel to learn a lot of things, hehe, knowledge needs to sum up and accumulate ...

JavaScript Date format and this month's get