Subtract days months years from a date in JavaScript

Question

Does anybody know of a simple way of taking a date  e g  Today  and going back X days  X months and X years   I have tried that   var date   new Date        searchDateFrom   val  date getMonth   -1            date getDate   - 6           date getFullYear   - 1      But I got a negative date  for example today the output was      3 -3 2015   Any advise   Thanks

User · Answer

I d recommend using the MomentJS libraries  They make all interactions with Dates a lot simpler   If you use Moment  your code would be as simple as this   var today   moment    var nextMonth   today add  month   1      note that both variables  today  and  nextMonth  refer to     the next month at this point  because  add  mutates in-place   You can find MomentJS here  http   momentjs com   UPDATE   In JavaScript  the Date getDate   function returns the current day of the month from 1-31  You are subtracting 6 from this number  and it is currently the 3rd of the month  This brings the value to -3

User · Answer

Use the moment js library for time and date management    import moment   require  moment     const now   moment     now subtract 7   seconds       7 seconds ago now subtract 7   days          7 days and 7 seconds ago now subtract 7   months        7 months  7 days and 7 seconds ago now subtract 7   years         7 years  7 months  7 days and 7 seconds ago    because  now  has been mutated  it no longer represents the current time

User · Answer

This does not answer the question fully  but for anyone who is able to calculate the number of days by which they would like to offset an initial date then the following method will work    myDate setUTCDate myDate getUTCDate     offsetDays     offsetDays can be positive or negative and the result will be correct for any given initial date with any given offset

User · Answer

I have a simpler answer  which works perfectly for days  for months  it s  -2 days  let today new Date    const days to subtract 30  let new date  new Date today valueOf  - days to subtract 24 60 60 1000     You get the idea - for months  multiply by 30  but that will be  -2 days

User · Answer

You are simply reducing the values from a number  So substracting 6 from 3  date  will return -3 only   You need to individually add remove unit of time in date object  var date   new Date    date setDate  date getDate   - 6    date setFullYear  date getFullYear   - 1        searchDateFrom   val  date getMonth              date getDate             date getFullYear

User · Answer

As others have said you re subtracting from the numeric values returned from methods like date getDate    you need to reset those values on your date variable  I ve created a method below that will do this for you  It creates a date using new Date   which will initialize with the current date  then sets the date  month  and year according to the values passed in  For example  if you want to go back 6 days then pass in -6 like so var newdate   createDate -6 0 0   If you don t want to set a value pass in a zero  or you could set default values   The method will return the new date for you  tested in Chrome and Firefox    function createDate days  months  years            var date   new Date             date setDate date getDate     days           date setMonth date getMonth     months           date setFullYear date getFullYear     years           return date

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I implemented a function similar to the momentjs method subtract   - If you use Javascript  function addDate dt  amount  dateType      switch  dateType        case  days         return dt setDate dt getDate     amount   amp  amp  dt      case  weeks         return dt setDate dt getDate      7   amount    amp  amp  dt      case  months         return dt setMonth dt getMonth     amount   amp  amp  dt      case  years         return dt setFullYear  dt getFullYear     amount   amp  amp  dt          example   let dt   new Date    dt   addDate dt  -1   months      use -1 to subtract    - If you use Typescript   export enum dateAmountType     DAYS    WEEKS    MONTHS    YEARS     export function addDate dt  Date  amount  number  dateType  dateAmountType   Date     switch  dateType        case dateAmountType DAYS        return dt setDate dt getDate     amount   amp  amp  dt      case dateAmountType WEEKS        return dt setDate dt getDate      7   amount    amp  amp  dt      case dateAmountType MONTHS        return dt setMonth dt getMonth     amount   amp  amp  dt      case dateAmountType YEARS        return dt setFullYear  dt getFullYear     amount   amp  amp  dt          example   let dt   new Date    dt   addDate dt  -1   months       use -1 to subtract   Optional  unit-tests   I also made some unit-tests for this function using Jasmine     it  addDate   should works properly        gt        for  const test of           amount  1   dateType  dateAmountType DAYS    expect   2020-04-13            amount  -1  dateType  dateAmountType DAYS    expect   2020-04-11            amount  1   dateType  dateAmountType WEEKS   expect   2020-04-19            amount  -1  dateType  dateAmountType WEEKS   expect   2020-04-05            amount  1   dateType  dateAmountType MONTHS  expect   2020-05-12            amount  -1  dateType  dateAmountType MONTHS  expect   2020-03-12            amount  1   dateType  dateAmountType YEARS   expect   2021-04-12            amount  -1  dateType  dateAmountType YEARS   expect   2019-04-12                   expect formatDate addDate new Date  2020-04-12    test amount  test dateType    toBe test expect                  To use this test you need this function      get format date as  YYYY-MM-DD  export function formatDate date  Date   string     const d       new Date date     let month           d getMonth     1     let day            d getDate      const year    d getFullYear       if  month length  lt  2         month    0    month        if  day length  lt  2        day    0    day         return  year  month  day  join  -

User · Answer

This is a pure-function which takes a passed-in starting date  building on Phil s answer   function deltaDate input  days  months  years        return new Date        input getFullYear     years         input getMonth     months         Math min          input getDate     days          new Date input getFullYear     years  input getMonth     months   1  0  getDate                      e g  writes the date one month ago to the console log   console log deltaDate new Date    0  -1  0      e g  subtracts a month from March 30  2020   console log deltaDate new Date 2020  2  30   0  -1  0       Feb 29  2020   Note that this works even if you go past the end of the month or year   Update  As the example above shows  this has been updated to handle variances in the number of days in a month

[javascript] Subtract days, months, years from a date in JavaScript

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