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Javascript to add or subtract dates by month
JavaScript code example for date addition and subtraction. Because JavaScript does not have the AddDays method similar to C #, you need to write a function to implement date addition and subtraction. I would like to share it with you. If you need it, you can refer
You need to use it in the project and write it yourself. Javascript date plus or minus by month
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<! DOCTYPE html> <Html xmlns = "http://www.w3.org/1999/xhtml"> <Head> <Meta charset = "UTF-8"> <Title> </title> <Script> Function dateToDate (date ){ Var sDate = new Date (); If (typeof date = 'object' & Typeof new Date (). getMonth = "function" ){ SDate = date; } Else if (typeof date = "string "){ Var arr = date. split ('-') If (arr. length = 3 ){ SDate = new Date (arr [0] + '-' + arr [1] + '-' + arr [2]); } }
Return sDate; }
Function addMonth (date, num ){ Num = parseInt (num ); Var sDate = dateToDate (date );
Var sYear = sDate. getFullYear (); Var sMonth = sDate. getMonth () + 1; Var sDay = sDate. getDate ();
Var eYear = sYear; Var eMonth = sMonth + num; Var eDay = sDay; While (eMonth> 12 ){ EYear ++; EMonth-= 12; }
Var eDate = new Date (eYear, eMonth-1, eDay );
While (eDate. getMonth ()! = EMonth-1 ){ EDay --; EDate = new Date (eYear, eMonth-1, eDay ); }
Return eDate; }
Function calcDate (){ Var d = document. getElementById ('date'). value; Var n = document. getElementById ('num'). value; Var eDate = addMonth (d, n ); Document. getElementById ('result '). innerHTML = eDate. getFullYear () + '-' + (eDate. getMonth () + 1) + '-' + eDate. getDate (); } </Script> </Head> <Body> <Input type = "date" id = "date"/> <Input type = "number" id = "num" value = "1"/> <Input type = "button" value = "Calculate" onclick = "calcDate ()"/> <Div id = "result"> </div> </Body> </Html> |
Method 2:
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<Script language = "javascript"> Date. prototype. Format = function (fmt) { // Code Author: meizz Var o = { "M +": this. getMonth () + 1, // month "D +": this. getDate (), // day "H +": this. getHours (), // hour "M +": this. getMinutes (), // minute "S +": this. getSeconds (), // second "Q +": Math. floor (this. getMonth () + 3)/3), // quarter "S": this. getMilliseconds () // millisecond }; 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]): ("00" + o [k]). substr ("" + o [k]). length ))); Return fmt; } Date. prototype. addDays = function (d) { This. setDate (this. getDate () + d ); }; Date. prototype. addWeeks = function (w) { This. addDays (w * 7 ); }; Date. prototype. addMonths = function (m) { Var d = this. getDate (); This. setMonth (this. getMonth () + m ); If (this. getDate () <d) This. setDate (0 ); }; Date. prototype. addYears = function (y) { Var m = this. getMonth (); This. setFullYear (this. getFullYear () + y ); If (m <this. getMonth ()) { This. setDate (0 ); } }; </Script> |
Method 3:
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<Script> Function DateAdd (interval, number, date) { /* * --------------- DateAdd (interval, number, date )----------------- * DateAdd (interval, number, date) * Function: implements the DateAdd function of VBScript. * Parameter: interval, a string expression, indicating the time interval to be added. * Parameter: number, numeric expression, indicating the number of time intervals to be added. * Parameter: date, time object. * Return: a new time object. * Var now = new Date (); * Var newDate = DateAdd ("d", 5, now ); * Author: wanghr100 (Baby gray bean. net) * Update: * --------------- DateAdd (interval, number, date )----------------- */ Switch (interval) { Case "y ":{ Date. setFullYear (date. getFullYear () + number ); Return date; Break; } Case "q ":{ Date. setMonth (date. getMonth () + number * 3 ); Return date; Break; } Case "m ":{ Date. setMonth (date. getMonth () + number ); Return date; Break; } Case "w ":{ Date. setDate (date. getDate () + number * 7 ); Return date; Break; } Case "d ":{ Date. setDate (date. getDate () + number ); Return date; Break; } Case "h ":{ Date. setHours (date. getHours () + number ); Return date; Break; } Case "m ":{ Date. setMinutes (date. getMinutes () + number ); Return date; Break; } Case "s ":{ Date. setSeconds (date. getSeconds () + number ); Return date; Break; } Default :{ Date. setDate (d. getDate () + number ); Return date; Break; } } } Var now = new Date (); // Add five days. Var newDate = DateAdd ("d", 5, now ); Alert (newDate. toLocaleDateString ()) // Add two months. NewDate = DateAdd ("m", 2, now ); Alert (newDate. toLocaleDateString ()) // Add one year NewDate = DateAdd ("y", 1, now ); Alert (newDate. toLocaleDateString ()) </Script> |
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