How to subtract days from a plain Date

Question

Is there an easy way of taking a olain JavaScript Date  e g  today  and going back X days  So  for example  if I want to calculate the date 5 days before today

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The top answers led to a bug in my code where on the first of the month it would set a future date in the current month  Here is what I did   curDate   new Date       Took current date as an example prvDate   new Date 0      Date set to epoch 0 prvDate setUTCMilliseconds  curDate -  5   24   60   60   1000       Set epoch time

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I get good mileage out of date js   http   www datejs com   d   new Date    d add -10  days        subtract 10 days   Nice   Website includes this beauty      Datejs doesn   t just parse strings  it slices them cleanly in two

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It goes something like this   var d   new Date       today  var x   5     go back 5 days  d setDate d getDate   - x

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for me all the combinations worked fine with below code snipplet     the snippet is for Angular-2 implementation    if you need to add days   pass positive numberofDays   if you need to substract pass negative numberofDays  function addSubstractDays date  Date  numberofDays  number   Date   let d   new Date date   return new Date      d getFullYear        d getMonth         d getDate     numberofDays

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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  Subtract 5 days x000D     3  Format it x000D     4  Output it x000D     --------------------------------------------------------------------- x000D  document body innerHTML   DateHelper format DateHelper addDays new Date    -5    x000D   x000D   x000D     see also this Fiddle

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x000D   x000D  var d   new Date    x000D   x000D  document write  Today is      d toLocaleString     x000D   x000D  d setDate d getDate   - 31   x000D   x000D  document write   lt br gt 5 days ago was      d toLocaleString     x000D   x000D   x000D

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I have created a function for date manipulation  you can add or subtract any number of days  hours  minutes    function dateManipulation date  days  hrs  mins  operator       date   new Date date      if  operator     -           var durationInMs      24   days    60     hrs   60    mins    60000        var newDate   new Date date getTime   - durationInMs        else         var durationInMs      24   days    60     hrs   60    mins    60000        var newDate   new Date date getTime     durationInMs           return newDate       Now  call this function by passing parameters  For example  here is a function call for getting date before 3 days from today   var today   new Date    var newDate   dateManipulation today  3  0  0   -

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This will give you last 10 days result 110  working you will not get any type of issue  var date   new Date    var day date getDate    var month date getMonth     1  var year date getFullYear    var startDate day     month     year  var dayBeforeNineDays moment   subtract 10   days   format  DD MM YYYY    startDate dayBeforeNineDays  var endDate day     month     year    you can change the subtract days according to your requirements

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I like doing the maths in milliseconds  So use Date now    var newDate   Date now     -5 24 3600 1000     date 5 days ago in milliseconds   and if you like it formatted  new Date newDate  toString       or  toUTCString or  toISOString       NOTE  Date now   doesn t work in older browsers  eg IE8 I think   Polyfill here   UPDATE June 2015   socketpair pointed out my sloppiness  As s he says  Some day in year have 23 hours  and some 25 due to timezone rules    To expand on that  the answer above will have daylightsaving inaccuracies in the case where you want to calculate the LOCAL day 5 days ago in a timezone with daylightsaving changes and you    assume  wrongly  that Date now   gives you the current LOCAL now time  or  use  toString   which returns the local date and therefore is incompatible with the Date now   base date in UTC      However  it works if you re doing your math all in UTC  eg  A  You want the UTC date 5 days ago from NOW  UTC   var newDate   Date now     -5 24 3600 1000     date 5 days ago in milliseconds UTC new Date newDate  toUTCString       or  toISOString    BUT NOT toString   B  You start with a UTC base date other than  now   using Date UTC    newDate   new Date Date UTC 2015  3  1   getTime     -5 24 3600000  new Date newDate  toUTCString       or  toISOString BUT NOT toString

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x000D   x000D  function addDays  date  daysToAdd    x000D    var  24HoursInMilliseconds   86400000  x000D    return new Date date getTime     daysToAdd    24HoursInMilliseconds   x000D     x000D   x000D  var now   new Date    x000D   x000D  var yesterday   addDays now  - 1   x000D   x000D  var tomorrow   addDays now  1   x000D   x000D   x000D

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Try something like this  dateLimit    curDate  limit    gt        offset    curDate getDate     limit     return new Date  curDate setDate  offset        currDate could be any date  limit could be the difference in number of day  positive for future and negative for past

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A few of the existing solutions were close  but not quite exactly what I wanted  This function works with both positive or negative values and handles boundary cases   function addDays date  days        return new Date          date getFullYear            date getMonth            date getDate     days          date getHours            date getMinutes            date getSeconds            date getMilliseconds

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I made this prototype for Date so that I could pass negative values to subtract days and positive values to add days   if  Date prototype adjustDate       Date prototype adjustDate   function days           var date           days   days    0           if days     0               date   new Date  this getTime                else if days  gt  0                date   new Date  this getTime                   date setDate date getDate     days             else               date   new Date                  this getFullYear                    this getMonth                    this getDate   - Math abs days                   this getHours                    this getMinutes                    this getSeconds                    this getMilliseconds                                     this setTime date getTime              return this             So  to use it i can simply write   var date subtract   new Date   adjustDate -4       date add   new Date   adjustDate 4

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A easy way to manage dates is use Moment js  You can use add  Example  var startdate    20 03 2014   var new date   moment startdate   DD MM YYYY    new date add 5   days      Add 5 days to start date alert new date     Docs http   momentjs com docs   manipulating add

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var my date   new Date   toISOString   substring 0  10     it can give you only date like 2014-06-20  hope will help

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get moment js  All the cool kids use it  It has more formatting options  etc  Where  var n   5  var dateMnsFive   moment  lt your date gt   subtract n    day      Optional  Convert to JS Date obj for Angular binding   var date   new Date dateMnsFive toISOString       Optional  Format  var date   dateMnsFive format  YYYY-MM-DD

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

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split your date into parts  then return a new Date with the adjusted values  function DateAdd date  type  amount       var y   date getFullYear            m   date getMonth            d   date getDate        if type      y            y    amount             if type      m            m    amount             if type      d            d    amount             return new Date y  m  d       Remember that the months are zero based  but the days are not  ie new Date 2009  1  1     01 February 2009  new Date 2009  1  0     31 January 2009

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See the following code  subtract the days from the current date  Also  set the month according to substracted date   var today   new Date    var substract no of days   25   today setTime today getTime   - substract no of days  24   60   60   1000   var substracted date    today getMonth   1         today getDate           today getFullYear     alert substracted date

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var dateOffset    24 60 60 1000    5    5 days var myDate   new Date    myDate setTime myDate getTime   - dateOffset     If you re performing lots of headachy date manipulation throughout your web application  DateJS will make your life much easier   http   simonwillison net 2007 Dec 3 datejs

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You can using Javascript   var CurrDate   new Date       Current Date var numberOfDays   5  var days   CurrDate setDate CurrDate getDate     numberOfDays   alert days      It will print 5 days before today   For PHP    date    date  Y-m-d   strtotime  -5 days        it shows 5 days before today  echo  date    Hope it will help you

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I converted into millisecond and deducted days else month and year won t change and logical  var numberOfDays   10   number of days need to deducted or added var date    01-01-2018    date need to change var dt   new Date parseInt date substring 6   10             Year               parseInt date substring 3 5   10  - 1     Month  0-11                parseInt date substring 0 2   10    var new dt   dt setMilliseconds dt getMilliseconds   - numberOfDays 24 60 60 1000   new dt   new Date new dt   var changed date   new dt getDate    -   new dt getMonth   1   -  new dt getFullYear      Hope helps

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Using Modern JavaScript function syntax   x000D   x000D  const getDaysPastDate    daysBefore  date   new Date    gt  new Date date -  1000   60   60   24   daysBefore    x000D   x000D  console log getDaysPastDate 1       yesterday x000D   x000D   x000D

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var daysToSubtract   3    datepicker formatDate  yy mm dd   new Date   - daysToSubtract

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To calculate relative time stamps with a more precise difference than whole days  you can use Date getTime   and Date setTime   to work with integers representing the number of milliseconds since a certain epoch   namely  January 1  1970  For example  if you want to know when it   s 17 hours after right now    x000D   x000D  const msSinceEpoch    new Date    getTime    const fortyEightHoursLater   new Date msSinceEpoch   48   60   60   1000  toLocaleString    const fortyEightHoursEarlier   new Date msSinceEpoch - 48   60   60   1000  toLocaleString    const fiveDaysAgo   new Date msSinceEpoch - 120   60   60   1000  toLocaleString     console log  msSinceEpoch  fortyEightHoursLater  fortyEightHoursEarlier  fiveDaysAgo   x000D   x000D   x000D   reference

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Use MomentJS     x000D   x000D  function getXDaysBeforeDate referenceDate  x    x000D    return moment referenceDate  subtract x    day   format  MMMM Do YYYY  h mm ss a    x000D    x000D   x000D  var yourDate   new Date       let s say today x000D  var valueOfX   7     let s say 7 days before x000D   x000D  console log getXDaysBeforeDate yourDate  valueOfX    x000D   lt script src  https   cdnjs cloudflare com ajax libs moment js 2 22 2 moment min js  gt  lt  script gt  x000D   x000D   x000D

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When setting the date  the date converts to milliseconds  so you need to convert it back to a date   This method also take into consideration  new year change etc   function addDays  date  days         var dateInMs   date setDate date getDate   - days       return new Date dateInMs      var date from   new Date    var date to   addDays  new Date    parseInt days

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Try something like this    var d   new Date     d setDate d getDate  -5     Note that this modifies the date object and returns the time value of the updated date    x000D   x000D  var d   new Date    x000D   x000D  document write  Today is      d toLocaleString     x000D   x000D  d setDate d getDate   - 5   x000D   x000D  document write   lt br gt 5 days ago was      d toLocaleString     x000D   x000D   x000D

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I like the following because it is one line   Not perfect with DST changes but usually good enough for my needs   var fiveDaysAgo   new Date new Date   -  1000 60 60 24 5

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x000D   x000D  var date   new Date    x000D  var day   date getDate    x000D  var mnth   date getMonth     1  x000D   x000D  var fDate   day         mnth         date getFullYear    x000D  document write  Today is      fDate   x000D  var subDate   date setDate date getDate   - 1   x000D  var todate   new Date subDate   x000D  var today   todate getDate    x000D  var tomnth   todate getMonth     1  x000D  var endDate   today         tomnth         todate getFullYear    x000D  document write   lt br gt 1 days ago was      endDate    x000D   x000D   x000D

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If you want it all on one line instead   5 days from today    past var thirtyDaysAgo   new Date new Date   setDate new Date   getDate   - 5      future var thirtyDaysInTheFuture   new Date new Date   setDate new Date   getDate     5      5 days from a specific date   var pastDate   new Date  2019-12-12T00 00 00        past  var thirtyDaysAgo   new Date new Date   setDate pastDate getDate   - 5       future  var thirtyDaysInTheFuture   new Date new Date   setDate pastDate getDate     5      I wrote a function you can use    x000D   x000D  function AddOrSubractDays startingDate  number  add    x000D    if  add    x000D      return new Date new Date   setDate startingDate getDate     number    x000D      else   x000D      return new Date new Date   setDate startingDate getDate   - number    x000D      x000D    x000D   x000D  console log  Today       new Date     x000D  console log  Future       AddOrSubractDays new Date    5  true    x000D  console log  Past       AddOrSubractDays new Date    5  false    x000D   x000D   x000D

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I find a problem with the getDate   setDate   method is that it too easily turns everything into milliseconds  and the syntax is sometimes hard for me to follow   Instead I like to work off the fact that 1 day   86 400 000 milliseconds   So  for your particular question   today   new Date   days   86400000   number of milliseconds in a day fiveDaysAgo   new Date today -  5 days     Works like a charm   I use this method all the time for doing rolling 30 60 365 day calculations   You can easily extrapolate this to create units of time for months  years  etc

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I noticed that the getDays  X doesn t work over day month boundaries  Using getTime works as long as your date is not before 1970   var todayDate   new Date    weekDate   new Date    weekDate setTime todayDate getTime  - 7 24 3600000

[javascript] How to subtract days from a plain Date?

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