How to add 30 minutes to a JavaScript Date object

Question

I d like to get a Date object which is 30 minutes later than another Date object   How do I do it with JavaScript

User · Answer

x000D   x000D  var oldDateObj   new Date    x000D  var newDateObj   new Date    x000D  newDateObj setTime oldDateObj getTime      30   60   1000    x000D  console log newDateObj   x000D   x000D   x000D

User · Answer

it is simple as it is  let initial date   new Date  let added30Min   new Date initial date getTime      30 60 1000

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var d1   new Date         d2   new Date   d1    d2 setMinutes   d1 getMinutes     30    alert   d2

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x000D   x000D  var now   new Date    x000D  now setMinutes now getMinutes     30      timestamp x000D  now   new Date now      Date object x000D  console log now   x000D   x000D   x000D

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Other solution  var dateAv   new Date    var endTime   new Date dateAv getFullYear    dateAv getMonth    dateAv getDate    dateAv getHours    dateAv getMinutes     30

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You should get the value of the current date to get the date with  ms  and add  30   60  1000  to it  Now you have  current date   30 min  with ms   x000D   x000D  console log  with ms   Date now      30   60   1000   x000D  console log  new Date   new Date Date now      30   60   1000    x000D   x000D   x000D

User · Answer

Just another option  which I wrote   DP DateExtensions Library  It s overkill if this is all the date processing that you need  but it will do what you want   Supports date time formatting  date math  add subtract date parts   date compare  date parsing  etc  It s liberally open sourced

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Here is the IsoString version   x000D   x000D  console log new Date new Date   setMinutes new Date   getMinutes   -  30    toISOString     x000D   x000D   x000D

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Here is the ES6 version   let getTimeAfter30Mins        gt      let timeAfter30Mins   new Date      timeAfter30Mins   new Date timeAfter30Mins setMinutes timeAfter30Mins getMinutes     30         Call it like   getTimeAfter30Mins

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For the lazy like myself   Kip s answer  from above  in coffeescript  using an  enum   and operating on the same object   Date UNIT     YEAR  0   QUARTER  1   MONTH  2   WEEK  3   DAY  4   HOUR  5   MINUTE  6   SECOND  7 Date  add    unit  quantity  - gt    switch unit     when Date UNIT YEAR then  setFullYear  getFullYear     quantity      when Date UNIT QUARTER then  setMonth  getMonth      3   quantity       when Date UNIT MONTH then  setMonth  getMonth     quantity      when Date UNIT WEEK then  setDate  getDate      7   quantity       when Date UNIT DAY then  setDate  getDate     quantity      when Date UNIT HOUR then  setTime  getTime      3600000   quantity       when Date UNIT MINUTE then  setTime  getTime      60000   quantity       when Date UNIT SECOND then  setTime  getTime      1000   quantity       else throw new Error  Unrecognized unit provided        for chaining

User · Answer

You could do this    x000D   x000D  let thirtyMinutes   30   60   1000     convert 30 minutes to milliseconds x000D  let date1   new Date    x000D  let date2   new Date date1 getTime     thirtyMinutes   x000D  console log date1   x000D  console log date2   x000D   x000D   x000D

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I feel many of the answers here are lacking a creative component  very much needed for time travel computations  I present my solution for a temporal translation of 30 minutes     jsfiddle here   function fluxCapacitor n        var delta sigma 0 beta  ge        function K z             function a b c               beta beta  tT               switch b shift                      case 3  return z  0  a c b shift   1                   case 0  return z  3  a c b pop                     case 5  return z  2  a c b 0  1                   case 1  return z  4  a c b shift                     case 2  return z  5  a c b pop                     case 4  return z  1  a c b pop   1                            K pop   K pop   split     K pop            n toString   split      function b a c b1 gamma          delta  c b b1 a  sigma  gamma 3600000 0          beta beta  im               beta beta  e       return new Date  sigma  new Date  delta join        beta

User · Answer

I know that the topic is way too old  But I am pretty sure that there are some developpers who still need this  so I made this simple script for you  I hope you enjoy it  Hello back  It s 2020 and I ve added some modification hope it will help a lot better now   x000D   x000D  function strtotime date  addTime     let generatedTime date getTime      if addTime seconds  generatedTime  1000 addTime seconds    check for additional seconds    if addTime minutes  generatedTime  1000 60 addTime minutes   check for additional minutes    if addTime hours  generatedTime  1000 60 60 addTime hours   check for additional hours    return new Date generatedTime      Date prototype strtotime   function addTime     return strtotime new Date    addTime       let futureDate   new Date   strtotime       hours  16    Adding one hour     minutes  45    Adding fourty five minutes     seconds  0   Adding 0 seconds return to not adding any second so  we can remove it      x000D   lt button onclick  console log futureDate   gt Travel to the future lt  button gt  x000D   x000D   x000D

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Use an existing library known to handle the quirks involved in dealing with time calculations  My current favorite is moment js    lt script src    cdnjs cloudflare com ajax libs moment js 2 13 0 moment js  gt  lt  script gt   lt script gt   var now   moment       get  now   console log now toDate        show original date  var thirty   moment now  add 30  minutes       clone  now  object and add 30 minutes  taking into account weirdness like crossing DST boundries or leap-days  -minutes  -seconds   console log thirty toDate        show new date  lt  script gt

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Maybe something like this    x000D   x000D  var d   new Date    x000D  var v   new Date    x000D  v setMinutes d getMinutes   30   x000D   x000D  console log v  x000D   x000D   x000D

User · Answer

This is what I do which seems to work quite well   Date prototype addMinutes   function minutes        var copiedDate   new Date this getTime         return new Date copiedDate getTime     minutes   60000       Then you can just call this like this   var now   new Date    console log now addMinutes 50

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Using a Library  If you are doing a lot of date work  you may want to look into JavaScript date libraries like Datejs or Moment js  For example  with Moment js  this is simply   var newDateObj   moment oldDateObj  add 30   m   toDate      Vanilla Javascript  This is like chaos s answer  but in one line   var newDateObj   new Date oldDateObj getTime     diff 60000     Where diff is the difference in minutes you want from oldDateObj s time  It can even be negative   Or as a reusable function  if you need to do this in multiple places   function addMinutes date  minutes        return new Date date getTime     minutes 60000       And just in case this is not obvious  the reason we multiply minutes by 60000 is to convert minutes to milliseconds   Be Careful with Vanilla Javascript  Dates Are Hard   You may think you can add 24 hours to a date to get tomorrow s date  right  Wrong   addMinutes myDate  60 24     DO NOT DO THIS   It turns out  if the user observes daylight saving time  a day is not necessarily 24 hours long  There is one day a year that is only 23 hours long  and one day a year that is 25 hours long  For example  in most of the United States and Canada  24 hours after midnight  Nov 2  2014  is still Nov 2   const NOV   10    because JS months are off by one    addMinutes new Date 2014  NOV  2   60 24     In USA  prints 11pm on Nov 2  not 12am Nov 3    This is why using one of the afore-mentioned libraries is a safer bet if you have to do a lot of work with this   Below is a more generic version of this function that I wrote  I d still recommend using a library  but that may be overkill impossible for your project  The syntax is modeled after MySQL DATE ADD function          Adds time to a date  Modelled after MySQL DATE ADD function     Example  dateAdd new Date     minute   30     returns 30 minutes from now     https   stackoverflow com a 1214753 18511         param date  Date to start with     param interval  One of  year  quarter  month  week  day  hour  minute  second     param units  Number of units of the given interval to add      function dateAdd date  interval  units      if   date instanceof Date       return undefined    var ret   new Date date     don t change original date   var checkRollover   function     if ret getDate      date getDate    ret setDate 0       switch String interval  toLowerCase          case  year       ret setFullYear ret getFullYear     units   checkRollover     break      case  quarter    ret setMonth ret getMonth     3 units   checkRollover     break      case  month      ret setMonth ret getMonth     units   checkRollover     break      case  week       ret setDate ret getDate     7 units    break      case  day        ret setDate ret getDate     units    break      case  hour       ret setTime ret getTime     units 3600000    break      case  minute     ret setTime ret getTime     units 60000    break      case  second     ret setTime ret getTime     units 1000    break      default          ret   undefined   break        return ret      Working jsFiddle demo

User · Answer

The easiest way to solve is the to recognize that in javascript dates are just numbers  It starts 0 or  Wed Dec 31 1969 18 00 00 GMT-0600  CST   Every 1 represents a millisecond  You can add or subtract milliseconds by getting the value and instantiating a new date using that value  You can manage it pretty easy with that mind   const minutesToAdjust   10  const millisecondsPerMinute   60000  const originalDate   new Date  11 20 2017 10 00 AM    const modifiedDate1   new Date originalDate valueOf   -  minutesToAdjust   millisecondsPerMinute    const modifiedDate2   new Date originalDate valueOf      minutesToAdjust   millisecondsPerMinute     console log originalDate      Mon Nov 20 2017 10 00 00 GMT-0600  CST  console log modifiedDate1      Mon Nov 20 2017 09 50 00 GMT-0600  CST  console log modifiedDate2      Mon Nov 20 2017 10 10 00 GMT-0600  CST

User · Answer

I always create 7 functions  to work with date in JS  addSeconds  addMinutes  addHours  addDays  addWeeks  addMonths  addYears  You can see an example here  http   jsfiddle net tiagoajacobi YHA8x  How to use  var now   new Date    console log now addMinutes 30    console log now addWeeks 3     These are the functions  Date prototype addSeconds   function seconds      this setSeconds this getSeconds     seconds     return this      Date prototype addMinutes   function minutes      this setMinutes this getMinutes     minutes     return this      Date prototype addHours   function hours      this setHours this getHours     hours     return this      Date prototype addDays   function days      this setDate this getDate     days     return this      Date prototype addWeeks   function weeks      this addDays weeks 7     return this      Date prototype addMonths   function  months      var dt   this getDate      this setMonth this getMonth     months     var currDt   this getDate      if  dt     currDt          this addDays -currDt         return this      Date prototype addYears   function years      var dt   this getDate      this setFullYear this getFullYear     years     var currDt   this getDate      if  dt     currDt          this addDays -currDt         return this

User · Answer

Here is my one-liner    x000D   x000D  console log  time     new Date new Date   valueOf     60000   x000D   x000D   x000D

[javascript] How to add 30 minutes to a JavaScript Date object?

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