Incrementing a date in JavaScript

Question

I need to increment a date value by one day in JavaScript   For example  I have a date value 2010-09-11 and I need to store the date of the next day in a JavaScript variable   How can I increment a date by a day

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Date prototype AddDays   function  days        days   parseInt days  10       return new Date this valueOf     1000   60   60   24   days       Example  var dt   new Date    console log dt AddDays -30    console log dt AddDays -10    console log dt AddDays -1    console log dt AddDays 0    console log dt AddDays 1    console log dt AddDays 10    console log dt AddDays 30      Result  2017-09-03T15 01 37 213Z 2017-09-23T15 01 37 213Z 2017-10-02T15 01 37 213Z 2017-10-03T15 01 37 213Z 2017-10-04T15 01 37 213Z 2017-10-13T15 01 37 213Z 2017-11-02T15 01 37 213Z

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This a simpler method   and it will return the date in simple yyyy-mm-dd format   Here it is function incDay date  n        var fudate   new Date new Date date  setDate new Date date  getDate     n        fudate   fudate getFullYear      -     fudate getMonth     1     -    fudate toDateString   substring 8  10       return fudate      example   var tomorrow   incDay new Date    1      the next day of today   aka tomorrow      var spicaldate   incDay  quot 2020-11-12 quot   1      return  quot 2020-11-13 quot    var somedate   incDay  quot 2020-10-28 quot   5      return  quot 2020-11-02 quot     Note incDay new Date  quot 2020-11-12 quot    1    incDay  quot 2020-11-12 quot   1     will return the same result

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The easiest way is to convert to milliseconds and add 1000 60 60 24 milliseconds e g    var tomorrow   new Date today getTime   1000 60 60 24

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Via native JS  to add one day you may do following   let date   new Date       today date setDate date getDate     1     tomorrow   Another option is to use moment library   const date   moment   add 14   days   toDate

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Get the string value of the date using the dateObj toJSON   method Ref  https   developer mozilla org en-US docs Web JavaScript Reference Global Objects Date toJSON Slice the date from the returned value and then increment by the number of days you want   var currentdate   new Date    currentdate setDate currentdate getDate     1   var tomorrow   currentdate toJSON   slice 0 10

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Incrementing date s year with vanilla js   start date value    01 01 2019  var next year   new Date start date value   next year setYear next year getYear     1   console log next year getYear         gt  2020   Just in case someone wants to increment other value than the date  day

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Getting the next 5 days   var date   new Date    d   date getDate    m   date getMonth    y   date getFullYear      for i 0  i  lt  5  i     var curdate   new Date y  m  d i  console log curdate

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Results in a string representation of tomorrow s date  Use new Date   to get today s date  adding one day using Date getDate   and Date setDate    and converting the Date object to a string     const tomorrow        gt          let t   new Date          t setDate t getDate     1         return    t getFullYear   -  String t getMonth     1  padStart 2   0   -  String          t getDate           padStart 2   0                 tomorrow

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None of the examples in this answer seem to work with Daylight Saving Time adjustment days  On those days  the number of hours in a day are not 24  they are 23 or 25  depending on if you are  springing forward  or  falling back     The below AddDays javascript function accounts for daylight saving time   function addDays date  amount      var tzOff   date getTimezoneOffset     60   1000        t   date getTime          d   new Date          tzOff2     t     1000   60   60   24    amount    d setTime t      tzOff2   d getTimezoneOffset     60   1000    if  tzOff    tzOff2        var diff   tzOff2 - tzOff      t    diff      d setTime t          return d      Here are the tests I used to test the function       var d   new Date 2010 10 7       var d2   AddDays d  1       document write d toString       lt br   gt     d2 toString          d   new Date 2010 10 8       d2   AddDays d  -1      document write   lt hr   gt  lt br   gt      d toString       lt br   gt     d2 toString          d   new Date  Sun Mar 27 2011 01 59 00 GMT 0100  CET         d2   AddDays d  1      document write   lt hr   gt  lt br   gt      d toString       lt br   gt     d2 toString          d   new Date  Sun Mar 28 2011 01 59 00 GMT 0100  CET         d2   AddDays d  -1      document write   lt hr   gt  lt br   gt      d toString       lt br   gt     d2 toString

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Tomorrow in one line in pure JS but it s ugly    new Date new Date   setDate new Date   getDate     1     Here is the result     Thu Oct 12 2017 08 53 30 GMT 0200  Romance Summer Time

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var myDate   new Date       add a day to the date myDate setDate myDate getDate     1

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I feel that nothing is safer than  getTime   and  setTime    so this should be the best  and performant as well   const d   new Date   console log d setTime d getTime     1000   60   60   24      MILLISECONDS    setDate   for invalid Date  like 31   1  is too dangerous  and it depends on the browser implementation

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Not entirelly sure if it is a BUG Tested Firefox 32 0 3 and Chrome 38 0 2125 101   but the following code will fail on Brazil  -3 GMT    Date prototype shiftDays   function days         days   parseInt days  10     this setDate this getDate     days     return this      date   new Date 2014  9  16 0 1 1    date shiftDays 1   console log  date       date shiftDays 1   console log  date       date shiftDays 1   console log  date       date shiftDays 1   console log  date        Result   Fri Oct 17 2014 00 01 01 GMT-0300 Sat Oct 18 2014 00 01 01 GMT-0300 Sat Oct 18 2014 23 01 01 GMT-0300 Sun Oct 19 2014 23 01 01 GMT-0200   Adding one Hour to the date  will make it work perfectly  but does not solve the problem     date   new Date 2014  9  16 0 1 1     Result   Fri Oct 17 2014 01 01 01 GMT-0300 Sat Oct 18 2014 01 01 01 GMT-0300 Sun Oct 19 2014 01 01 01 GMT-0200 Mon Oct 20 2014 01 01 01 GMT-0200

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Three options for you   1  Using just JavaScript s Date object  no libraries    My previous answer for  1 was wrong  it added 24 hours  failing to account for transitions to and from daylight saving time  Clever Human pointed out that it would fail with November 7  2010 in the Eastern timezone   Instead  Jigar s answer is the correct way to do this without a library   var tomorrow   new Date    tomorrow setDate tomorrow getDate     1     This works even for the last day of a month  or year   because the JavaScript date object is smart about rollover    x000D   x000D  var lastDayOf2015   new Date 2015  11  31   x000D  snippet log  Last day of 2015      lastDayOf2015 toISOString     x000D  var nextDay   new Date  lastDayOf2015   x000D  var dateValue   nextDay getDate     1  x000D  snippet log  Setting the  date  part to     dateValue   x000D  nextDay setDate dateValue   x000D  snippet log  Resulting date      nextDay toISOString     x000D   lt  -- Script provides the  snippet  object  see http   meta stackexchange com a 242144 134069 -- gt  x000D   lt script src    tjcrowder github io simple-snippets-console snippet js  gt  lt  script gt  x000D   x000D   x000D     This answer is currently accepted  so I can t delete it  Before it was accepted I suggested to the OP they accept Jigar s  but perhaps they accepted this one for items  2 or  3 on the list    2  Using MomentJS   var today   moment    var tomorrow   moment today  add 1   days       Beware that add modifies the instance you call it on  rather than returning a new instance  so today add 1   days   would modify today  That s why we start with a cloning op on var tomorrow          3  Using DateJS  but it hasn t been updated in a long time   var today   new Date       Or Date today   var tomorrow   today add 1  day

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You first need to parse your string before following the other people s suggestion   var dateString    2010-09-11   var myDate   new Date dateString      add a day to the date myDate setDate myDate getDate     1     If you want it back in the same format again you will have to do that  manually    var y   myDate getFullYear        m   myDate getMonth     1     january is month 0 in javascript     d   myDate getDate    var pad   function val    var str   val toString    return  str length  lt  2     0    str   str   dateString    y  pad m   pad d   join  -      But I suggest getting Date js as mentioned in other replies  that will help you alot

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Two methods    1   var a   new Date      no of days is an integer value var b   new Date a setTime a getTime     no of days   86400000    2  Similar to the previous method  var a   new Date      no of days is an integer value var b   new Date a setDate a getDate     no of days

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Timezone daylight savings aware date increment for JavaScript dates   function nextDay date        const sign   v   gt   v  lt  0   -1    1       const result   new Date date getTime         result setDate result getDate     1       const offset   result getTimezoneOffset        return new Date result getTime     sign offset    offset   60   1000

[javascript] Incrementing a date in JavaScript

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