Add days to JavaScript Date

Question

How to add days to current Date using JavaScript  Does JavaScript have a built in function like  Net s AddDay

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var today   new Date    var tomorrow   new Date    tomorrow setDate today getDate   1     Be careful  because this can be tricky   When setting  tomorrow   it only works because it s current value matches the year and month for  today    However  setting to a date number like  32  normally will still work just fine to move it to the next month

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2 39KB minified  One file  https   github com rhroyston clock-js   x000D   x000D  console log clock what weekday clock now   clock unit days       wednesday  x000D  console log clock what weekday clock now    clock unit days   2        thursday  x000D  console log clock what weekday clock now    clock unit days   3        friday  x000D   lt script src  https   raw githubusercontent com rhroyston clock-js master clock min js  gt  lt  script gt  x000D   x000D   x000D

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I guess I ll give an answer as well  Personally  I like to attempt to avoid gratuitous variable declaration  method calls  and constructor calls  as they are all expensive on performance   within reason  of course  I was going to leave this as just comment under the Answer given by  AnthonyWJones but thought better of it      Prototype usage    Date prototype addDays   Date prototype addDays    function  days         return this setTime  864E5   days   this valueOf      amp  amp  this         Namespace usage    namespace addDaysToDate   function  date  days         return date setTime  864E5   days   date valueOf      amp  amp  date         Basic Function declaration    function addDaysToDate  date  days         return date setTime  864E5   days   date valueOf      amp  amp  date       The above will respect DST  Meaning if you add a number of days that cross DST  the displayed time  hour  will change to reflect that  Example  Nov 2  2014 02 00 was the end of DST   var dt   new Date  2014  10  1  10  30  0    console log  dt                        Sat Nov 01 2014 10 30 00 console log  dt addDays  10            Tue Nov 11 2014 09 30 00   If you re looking to retain the time across DST  so 10 30 will still be 10 30         Prototype usage    Date prototype addDays   Date prototype addDays    function  days         return this setDate  this getDate     days    amp  amp  this         Namespace usage    namespace addDaysToDate   function  date  days         return date setDate  date getDate     days    amp  amp  date         Basic Function declaration    function addDaysToDate  date  days         return date setDate  date getDate     days    amp  amp  date       So  now you have     var dt   new Date  2014  10  1  10  30  0    console log  dt                        Sat Nov 01 2014 10 30 00 console log  dt addDays  10            Tue Nov 11 2014 10 30 00

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My test exemple can do adition an minus in the same instance of Date Object   x000D   x000D  Date prototype reset   function         let newDate   new Date this timeStamp      this setFullYear         newDate getFullYear        this setMonth            newDate getMonth        this setDate             newDate getDate        this setHours            newDate getHours        this setMinutes      newDate getMinutes        this setSeconds      newDate getSeconds        this setMilliseconds     newDate getMilliseconds       Date prototype addDays   function days          this timeStamp   this Symbol toPrimitive   number         let daysInMiliseconds    days    1000   60   60   24         this timeStamp   this timeStamp   daysInMiliseconds       this reset      Date prototype minusDays   function days          this timeStamp   this Symbol toPrimitive   number         let daysInMiliseconds    days    1000   60   60   24         if daysInMiliseconds  lt   this timeStamp                    this timeStamp   this timeStamp - daysInMiliseconds           this reset                      var temp   new Date Date now      from now time  console log temp toDateString    temp addDays 31  console log temp toDateString    temp minusDays 5  console log temp toDateString    x000D   x000D   x000D

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You can use JavaScript  no jQuery required   var someDate   new Date    var numberOfDaysToAdd   6  someDate setDate someDate getDate     numberOfDaysToAdd    Formatting to dd mm yyyy    var dd   someDate getDate    var mm   someDate getMonth     1  var y   someDate getFullYear     var someFormattedDate   dd        mm        y

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int days   1  var newDate   new Date Date now     days   24 60 60 1000     CodePen   x000D   x000D  var days   2  x000D  var newDate   new Date Date now     days   24 60 60 1000   x000D   x000D  document write  Today   lt em gt     x000D  document write new Date     x000D  document write   lt  em gt  lt br  gt  New   lt strong gt     x000D  document write newDate   x000D   x000D   x000D

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the same answer   How to add number of days to today  39 s date       function DaysOfMonth nYear  nMonth            switch  nMonth                case 0         January                 return 31  break              case 1         February                 if   nYear   4     0                        return 29                                    else                       return 28                                     break              case 2         March                 return 31  break              case 3         April                 return 30  break              case 4         May                 return 31  break              case 5         June                 return 30  break              case 6         July                 return 31  break              case 7         August                 return 31  break              case 8         September                 return 30  break              case 9         October                 return 31  break              case 10         November                 return 30  break              case 11         December                 return 31  break                        function SkipDate dDate  skipDays            var nYear   dDate getFullYear            var nMonth   dDate getMonth            var nDate   dDate getDate            var remainDays   skipDays          var dRunDate   dDate           while  remainDays  gt  0                remainDays month   DaysOfMonth nYear  nMonth  - nDate              if  remainDays  gt  remainDays month                    remainDays   remainDays - remainDays month - 1                  nDate   1                  if  nMonth  lt  11    nMonth   nMonth   1                    else                       nMonth   0                      nYear   nYear   1                                               else                   nDate   nDate   remainDays                  remainDays   0                             dRunDate   Date nYear  nMonth  nDate                     return new Date nYear  nMonth  nDate

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No  javascript has no a built in function  but you can use a simple line of code  timeObject setDate timeObject getDate     countOfDays

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You can create one with -  x000D   x000D  Date prototype addDays   function days        var date   new Date this valueOf         date setDate date getDate     days       return date     var date   new Date     console log date addDays 5    x000D   x000D   x000D   This takes care of automatically incrementing the month if necessary  For example  8 31   1 day will become 9 1  The problem with using setDate directly is that it s a mutator and that sort of thing is best avoided  ECMA saw fit to treat Date as a mutable class rather than an immutable structure

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Extending prototype in javascript may not be a good idea  especially in professional codebases   What you want to do is extend the native Date class    x000D   x000D  class MyCustomDate extends Date   x000D   x000D    addDays days    x000D      const date   new MyCustomDate this valueOf     x000D      date setDate date getDate     days   x000D      return date  x000D      x000D     x000D    x000D   x000D  const today   new MyCustomDate    x000D   x000D  const nextWeek   today addDays 7  x000D   x000D  console log nextWeek  x000D   x000D   x000D    This way  if one day Javascript implements a native addDays method  you won t break anything

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try this  function addDays date days                  var one day 1000 60 60 24         return new Date date getTime    days one day   toLocaleDateString

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These answers seem confusing to me  I prefer   var ms   new Date   getTime     86400000  var tomorrow   new Date ms     getTime   gives us milliseconds since 1970  and 86400000 is the number of milliseconds in a day   Hence  ms contains milliseconds for the desired date    Using the millisecond constructor gives the desired date object

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There s a setDate and a getDate method  which allow you to do something like this    var newDate   aDate setDate aDate getDate     numberOfDays     If you want to both subtract a number of days and format your date in a human readable format  you should consider creating a custom DateHelper object that looks something like this     x000D   x000D  var DateHelper     x000D      addDays   function aDate  numberOfDays    x000D          aDate setDate aDate getDate     numberOfDays      Add numberOfDays x000D          return aDate                                      Return the date x000D         x000D      format   function format date    x000D          return   x000D               0    date getDate    slice -2                Get day and pad it with zeroes x000D               0     date getMonth   1   slice -2           Get month and pad it with zeroes x000D             date getFullYear                               Get full year x000D            join                                            Glue the pieces together x000D        x000D    x000D   x000D     With this helper  you can now just use one line of readable code to   x000D     --------------------------------------------------------------------- x000D     1  Get the current date x000D     2  Add 20 days x000D     3  Format it x000D     4  Output it x000D     --------------------------------------------------------------------- x000D  document body innerHTML   DateHelper format DateHelper addDays new Date    20    x000D   x000D   x000D     see also this Fiddle

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Thanks Jason for your answer that works as expected  here is a mix from your code and the handy format of AnthonyWJones    Date prototype addDays   function days       var ms   new Date   getTime      86400000   days       var added   new Date ms       return added

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Some implementations to extend Date https   gist github com netstart c92e09730f3675ba8fb33be48520a86d         just import  like       import       shared utils date prototype extendions ts       declare global     interface Date       addDays days  number  useThis   boolean   Date       addSeconds seconds  number   Date       addMinutes minutes  number   Date       addHours hours  number   Date       addMonths months  number   Date       isToday    boolean       clone    Date       isAnotherMonth date  Date   boolean       isWeekend    boolean       isSameDate date  Date   boolean       getStringDate    string         Date prototype addDays   function days  number   Date     if   days        return this        this setDate this getDate     days     return this      Date prototype addSeconds   function seconds  number      let value   this valueOf      value    1000   seconds    return new Date value       Date prototype addMinutes   function minutes  number      let value   this valueOf      value    60000   minutes    return new Date value       Date prototype addHours   function hours  number      let value   this valueOf      value    3600000   hours    return new Date value       Date prototype addMonths   function months  number      const value   new Date this valueOf        let mo   this getMonth      let yr   this getYear       mo    mo   months    12    if  0  gt  mo        yr     this getMonth     months - mo - 12    12      mo    12      else       yr      this getMonth     months - mo    12          value setMonth mo     value setFullYear yr     return value      Date prototype isToday   function    boolean     const today   new Date      return this isSameDate today       Date prototype clone   function    Date     return new Date  this       Date prototype isAnotherMonth   function date  Date   boolean     return date  amp  amp  this getMonth       date getMonth        Date prototype isWeekend   function    boolean     return this getDay       0    this getDay       6      Date prototype isSameDate   function date  Date   boolean     return date  amp  amp  this getFullYear       date getFullYear    amp  amp  this getMonth       date getMonth    amp  amp  this getDate       date getDate        Date prototype getStringDate   function    string        Month names in Brazilian Portuguese   const monthNames     Janeiro    Fevereiro    Mar  o    Abril    Maio    Junho    Julho    Agosto    Setembro    Outubro    Novembro    Dezembro         Month names in English      let monthNames     January    February    March    April    May    June    July    August    September    October    November    December      const today   new Date      if  this getMonth       today getMonth    amp  amp  this getDay       today getDay          return  Hoje          return  Today       else if  this getMonth       today getMonth    amp  amp  this getDay       today getDay     1        return  Amanh            return  Tomorrow       else if  this getMonth       today getMonth    amp  amp  this getDay       today getDay   - 1        return  Ontem          return  Yesterday       else       return this getDay       de     this monthNames this getMonth        de     this getFullYear           return this monthNames this getMonth            this getDay             this getFullYear             export

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Here is the way that use to add days  months  and years for a particular date in Javascript     To add Days var d   new Date    d setDate d getDate     5       To add Months var m   new Date    m setMonth m getMonth     5       To add Years var m   new Date    m setFullYear m getFullYear     5

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Why so complicated  Let s assume you store the number of days to add in a variable called days to add  Then this short one should do it  calc date   new Date Date now     days to add   86400000     With Date now   you get the actual unix timestamp as milliseconds and then you add as many milliseconds as you want to add days to  One day is 24h60min60s 1000ms   86400000 ms or 864E5

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Without using the second variable  you can replace 7 with your next x days   let d new Date new Date   getTime      7   24   60   60   1000

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function addDays n       var t   new Date        t setDate t getDate     n        var month    0   t getMonth   1       var date    0  t getDate        month   month slice -2       date   date slice -2        var date   date      month      t getFullYear        alert date      addDays 5

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The simplest solution    x000D   x000D   Date prototype addDays   function days    x000D     this setDate this getDate     parseInt days    x000D     return this  x000D      x000D   x000D      and then call x000D   x000D   var newDate   new Date   addDays 2      2 days x000D   console log newDate   x000D   x000D      or x000D   x000D   var newDate1   new Date   addDays -2     -2 days x000D   console log newDate1   x000D   x000D   x000D

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I created these extensions last night  you can pass either positive or negative values   example   var someDate   new Date    var expirationDate   someDate addDays 10   var previous   someDate addDays -5     Date prototype addDays   function  num        var value   this valueOf        value    86400000   num      return new Date value      Date prototype addSeconds   function  num        var value   this valueOf        value    1000   num      return new Date value      Date prototype addMinutes   function  num        var value   this valueOf        value    60000   num      return new Date value      Date prototype addHours   function  num        var value   this valueOf        value    3600000   num      return new Date value      Date prototype addMonths   function  num        var value   new Date this valueOf          var mo   this getMonth        var yr   this getYear         mo    mo   num    12      if  0  gt  mo            yr     this getMonth     num - mo - 12    12          mo    12            else         yr      this getMonth     num - mo    12        value setMonth mo       value setYear yr       return value

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Generic prototype with no variables  it applies on an existing Date value   Date prototype addDays   function  days        return new Date this valueOf     days   864e5

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Try   var someDate   new Date    var duration   2    In Days someDate setTime someDate getTime       duration   24   60   60   1000      Using setDate   to add a date wont solve your problem  try adding some days to a Feb month  if you try to add new days to it  it wont result in what you expected

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The easiest way to get this done is using date-fns library   var addDays   require  date-fns add days   addDays date  amount    The documentation is available in this link here  You can also get this done using moment js  The reference link is here  Hope it helps

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I am using the following solution   var msInDay   86400000  var daysToAdd   5  var now   new Date    var milliseconds   now getTime    var newMillisecods   milliseconds   msInDay   daysToAdd  var newDate   new Date newMillisecods     or now setTime newMillisecods     Date has a constructor that accepts an int  This argument represents total milliseconds before after Jan 1  1970  It also has a method setTime which does the same without creating a new Date object   What we do here is convert days to milliseconds and add this value to the value provided by getTime  Finally  we give the result to Date milliseconds  constructor or setTime milliseconds  method

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the simplest answer is  assuming the need is to add 1 day to the current date  var currentDate   new Date    var numberOfDayToAdd   1  currentDate setDate currentDate getDate     numberOfDayToAdd     To explain to you  line by line  what this code does   Create the current date variable named currentDate  By default  quot new Date   quot  automatically assigns the current date to the variable  Create a variable to save the number of day s  to add to the date  you can skip this variable and use directly the value in the third line  Change the value of Date  because Date is the number of the month s day saved in the object  by giving the same value   the number you want  The switch to the next month will be automatic

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Old I know  but sometimes I like this   function addDays days        return new Date Date now     864e5   days

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A solution designed for the pipeline operator   const addDays   days   gt  date   gt      const result   new Date date      result setDate result getDate     days      return result       Usage      Without the pipeline operator    addDays 7  new Date         And with the pipeline operator    new Date     gt  addDays 7     If you need more functionality  I suggest looking into the date-fns library

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The mozilla docs for setDate   don t indicate that it will  handle end of month scenarios  See https   developer mozilla org en-US docs JavaScript Reference Global Objects Date setDate    Sets the day of the month  1-31  for a specified date according to local time   That is why I use setTime   when I need to add days

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Correct Answer   function addDays date  days      var result   new Date date     result setDate result getDate     days     return result      Incorrect Answer   This answer sometimes provides the correct result but very often returns the wrong year and month  The only time this answer works is when the date that you are adding days to happens to have the current year and month      Don t do it this way  function addDaysWRONG date  days      var result   new Date      result setDate date getDate     days     return result      Proof   Example  Check this JsFiddle   x000D   x000D     Correct x000D  function addDays date  days    x000D      var result   new Date date   x000D      result setDate result getDate     days   x000D      return result  x000D    x000D   x000D     Bad Year Month x000D  function addDaysWRONG date  days    x000D      var result   new Date    x000D      result setDate date getDate     days   x000D      return result  x000D    x000D   x000D     Bad during DST x000D  function addDaysDstFail date  days    x000D      var dayms    days   24   60   60   1000   x000D      return new Date date getTime     dayms       x000D    x000D   x000D     TEST x000D  function formatDate date    x000D      return  date getMonth     1          date getDate           date getFullYear    x000D    x000D   x000D     tbody tr td first-child   each function      x000D      var  in     this   x000D      var  out       lt td  gt    insertAfter  in  addClass  answer    x000D      var  outFail       lt td  gt    insertAfter  out   x000D      var  outDstFail       lt td  gt    insertAfter  outFail   x000D      var date   new Date  in text     x000D      var correctDate   formatDate addDays date  1    x000D      var failDate   formatDate addDaysWRONG date  1    x000D      var failDstDate   formatDate addDaysDstFail date  1    x000D   x000D       out text correctDate   x000D       outFail text failDate   x000D       outDstFail text failDstDate   x000D       outFail addClass correctDate    failDate    right     wrong    x000D       outDstFail addClass correctDate    failDstDate    right     wrong    x000D      x000D  body   x000D      font-size  14px  x000D    x000D   x000D  table   x000D      border-collapse collapse  x000D    x000D  table  td  th   x000D      border 1px solid black  x000D    x000D  td   x000D      padding  2px  x000D    x000D   x000D   wrong   x000D      color  red  x000D    x000D   right   x000D      color  green  x000D    x000D   answer   x000D      font-weight  bold  x000D    x000D   lt script src  https   ajax googleapis com ajax libs jquery 1 11 1 jquery min js  gt  lt  script gt  x000D   lt table gt  x000D       lt tbody gt  x000D           lt tr gt  x000D               lt th colspan  4  gt DST Dates lt  th gt  x000D           lt  tr gt  x000D           lt tr gt  x000D               lt th gt Input lt  th gt  x000D               lt th gt  1 Day lt  th gt  x000D               lt th gt  1 Day Fail lt  th gt  x000D               lt th gt  1 Day DST Fail lt  th gt  x000D           lt  tr gt  x000D           lt tr gt  lt td gt 03 10 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 11 03 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 03 09 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 11 02 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 03 08 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 11 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  x000D               lt th colspan  4  gt 2013 lt  th gt  x000D           lt  tr gt  x000D           lt tr gt  x000D               lt th gt Input lt  th gt  x000D               lt th gt  1 Day lt  th gt  x000D               lt th gt  1 Day Fail lt  th gt  x000D               lt th gt  1 Day DST Fail lt  th gt  x000D           lt  tr gt  x000D           lt tr gt  lt td gt 01 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 02 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 03 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 04 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 05 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 06 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 07 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 08 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 09 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 10 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 11 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 12 01 2013 lt  td gt  lt  tr gt  x000D           lt tr gt  x000D               lt th colspan  4  gt 2014 lt  th gt  x000D           lt  tr gt  x000D           lt tr gt  x000D               lt th gt Input lt  th gt  x000D               lt th gt  1 Day lt  th gt  x000D               lt th gt  1 Day Fail lt  th gt  x000D               lt th gt  1 Day DST Fail lt  th gt  x000D           lt  tr gt  x000D           lt tr gt  lt td gt 01 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 02 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 03 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 04 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 05 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 06 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 07 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 08 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 09 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 10 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 11 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 12 01 2014 lt  td gt  lt  tr gt  x000D           lt tr gt  x000D               lt th colspan  4  gt 2015 lt  th gt  x000D           lt  tr gt  x000D           lt tr gt  x000D               lt th gt Input lt  th gt  x000D               lt th gt  1 Day lt  th gt  x000D               lt th gt  1 Day Fail lt  th gt  x000D               lt th gt  1 Day DST Fail lt  th gt  x000D           lt  tr gt  x000D           lt tr gt  lt td gt 01 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 02 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 03 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 04 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 05 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 06 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 07 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 08 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 09 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 10 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 11 01 2015 lt  td gt  lt  tr gt  x000D           lt tr gt  lt td gt 12 01 2015 lt  td gt  lt  tr gt  x000D       lt  tbody gt  x000D   lt  table gt  x000D   x000D   x000D

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Our team considers date-fns the best library in this space   It treats dates as immutable  Moment js will probably never adopt immutability   it s faster  and can be loaded modularly   const newDate   DateFns addDays oldDate  2

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Use js-joda  It is an awesome immutable date and time library for javascript  Here is an excerpt from its cheat-sheet   Add 17 days to today  LocalDate now   plusDays 17      You can also build the desired date from now multiple operations at once   LocalDate now      plusMonths 1     withDayOfMonth 1     minusDays 17      Or   var d   LocalDate parse  2019-02-23     d minus Period ofMonths 3  plusDays 3        2018-11-20

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I sum hours and days     Date prototype addDays   function days       days   parseInt days  10      this setDate this getUTCDate     days       return this     Date prototype addHours   function hrs       var hr   this getUTCHours     parseInt hrs    10       while hr  gt  24         hr   hr - 24        this addDays 1              this setHours hr       return this

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My simple solution is   nextday new Date oldDate getFullYear   oldDate getMonth   oldDate getDate   1     this solution does not have problem with daylight saving time  Also  one can add sub any offset for years  months  days etc   day new Date oldDate getFullYear  -2 oldDate getMonth   22 oldDate getDate   61     is correct code

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I can t believe there s no cut n paste solution in this thread after 5 years  SO  To get the same time-of-day regardless of summertime interference     Date prototype addDays   function days            var dat   new Date  this valueOf          var hour1   dat getHours       dat setTime  dat getTime     days   86400000     24 60 60 1000   24 hours     var hour2   dat getHours        if  hour1    hour2     summertime occured   - a WHOLE number of hours thank god          dat setTime  dat getTime      hour1 - hour2    3600000     60 60 1000   1 hour      return dat or     this setTime  dat getTime        to modify the object directly         There  Done

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Very simple code to add days in date in java script    x000D   x000D  var d   new Date    x000D  d setDate d getDate     prompt  how many days you want to add write here     x000D  alert d   x000D   x000D   x000D

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I ve used this approach to get the right date in one line to get the time plus one day following what people were saying above     new Date    setDate  new Date    getDate   1     I just figured I would build off a normal  new Date       new Date    getDate    gt  21   Using the code above I can now set all of that within Date   in  new Date    and it behaves normally    new Date   new Date    setDate  new Date    getDate   1     getDate    gt  22   or to get the Date object    new Date   new Date    setDate  new Date    getDate   1

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If you can  use moment js  JavaScript doesn t have very good native date time methods  The following is an example Moment s syntax    x000D   x000D  var nextWeek   moment   add 7   days    x000D  alert nextWeek   x000D   lt script src  https   cdnjs cloudflare com ajax libs moment js 2 17 1 moment-with-locales min js  gt  lt  script gt  x000D   x000D   x000D    Reference  http   momentjs com docs   manipulating add

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to substract 30 days use  24h 86400000ms   new Date  yourDate - 30  86400000     x000D   x000D  var yourDate new Date    x000D  var d   new Date  yourDate - 30  86400000   x000D   x000D  console log d  x000D   x000D   x000D

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I had issues with daylight savings time with the proposed solution   By using getUTCDate   setUTCDate instead  I solved my issue      Curried  so that I can create helper functions like  add1Day  const addDays   num   gt  date   gt         Make a working copy so we don t mutate the supplied date    const d   new Date date      d setUTCDate d getUTCDate     num      return d

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As simple as this   new Date  new Date    getTime      60 60 24 1000

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The simplest approach that I have implemented is to use Date   itself    const days   15      Date now   gives the epoch date value  in milliseconds  of current date  nextDate   new Date  Date now     days   24   60   60   1000

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You can create your custom helper function here  function plusToDate currentDate  unit  howMuch         var config             second  1000     1000 miliseconds         minute  60000          hour  3600000          day  86400000          week  604800000          month  2592000000     Assuming 30 days in a month         year  31536000000    Assuming 365 days in year             var now   new Date currentDate        return new Date now   config unit    howMuch      var today   new Date    var theDayAfterTommorow   plusToDate today   day   2     By the way  this is generic solution for adding seconds or minutes or days whatever you want

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Late to the party  but if you use jQuery then there s an excellent plugin called Moment   http   momentjs com   var myDateOfNowPlusThreeDays   moment   add 3   days   toDate      http   momentjs com docs   manipulating   And lots of other good stuff in there   Edit  jQuery reference removed thanks to aikeru s comment

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I use something like   new Date dateObject getTime     amountOfDays   24   60   60   1000    Works with day saving time   new Date new Date 2014  2  29  20  0  0  getTime     1   24   60   60   1000    Works with new year   new Date new Date 2014  11  31  20  0  0  getTime     1   24   60   60   1000    It can be parametrized   function DateAdd source  amount  step      var factor   1    if  step     day   factor   24   60   60   1000    else if  step     hour   factor   60   60   1000          new Date source getTime     amount   factor

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For those using Angular   Just do    scope booking totTijd setMinutes  scope booking totTijd getMinutes   15    scope booking totTijd setDate  scope booking totTijd getDate     1

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Just spent ages trying to work out what the deal was with the year not adding when following the lead examples below   If you want to just simply add n days to the date you have you are best to just go      myDate setDate myDate getDate     n     or the longwinded version  var theDate   new Date 2013  11  15   var myNewDate   new Date theDate   myNewDate setDate myNewDate getDate     30   console log myNewDate     This today tomorrow stuff is confusing  By setting the current date into your new date variable you will mess up the year value  if you work from the original date you won t

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the day is 2013-12-31     var the day   Date UTC 2013  11  31           Now  the day will be  1388448000000  in UTC 8       var the next day   new Date the day   24   60   60   1000          Now  the next day will be  Wed Jan 01 2014 08 00 00 GMT 0800

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Edit  Instead of setTime    or setHours    you could do it this way   Date prototype addDays  function d     this setDate this getDate     d     return this      var tomorrow   new Date   addDays 1     Old   Instead of using setTime   you can use setHours     Date prototype addDays  function d       this setHours this getHours     d   24       return this      var tomorrow   new Date   addDays 1     See the JSFiddle

[javascript] Add days to JavaScript Date

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