Add a duration to a moment moment js

Question

Moment version  2 0 0  After reading the docs  I thought this would be straight-forward  Chrome console    var timestring1    2013-05-09T00 00 00Z   var timestring2    2013-05-09T02 00 00Z   var startdate   moment timestring1   var expected enddate   moment timestring2   var returned endate   startdate add moment duration 2   hours     returned endate    expected enddate     false returned endate     Moment   i   2013-05-09T00 00 00Z    f   YYYY-MM-DDTHH mm ss Z    l  undefined   isUTC  false   a  Array 7        This is a trivial example  but I can t even get it to work  I feel like I m missing something big here  but I really don t get it  Even this this doesn t seem to work   startdate add 2   hours          Moment   i   2013-05-09T00 00 00Z    f   YYYY-MM-DDTHH mm ss Z    l  undefined   isUTC  false   a  Array 7        Any help would be much appreciated   Edit  My end goal is to make an binary status chart like the one I m working on here  http   bl ocks org phobson 5872894  As you can see  I m currently using dummy x-values while I work through this issue

User · Answer

For people having a startTime  like 12h 30 30  and a duration  value in minutes like 120   you can guess the endTime like so   const startTime    12 30 00   const durationInMinutes    120    const endTime   moment startTime   HH mm ss   add durationInMinutes   minutes   format  HH mm        endTime is equal to  14 30

User · Answer

I think you missed a key point in the documentation for  add       Mutates the original moment by adding time    You appear to be treating it as a function that returns the immutable result   Easy mistake to make       If you use the return value  it is the same actual object as the one you started with   It s just returned as a convenience for method chaining   You can work around this behavior by cloning the moment  as described here   Also  you cannot just use    to test   You could format each moment to the same output and compare those  or you could just use the  isSame   method   Your code is now   var timestring1    2013-05-09T00 00 00Z   var timestring2    2013-05-09T02 00 00Z   var startdate   moment timestring1   var expected enddate   moment timestring2   var returned endate   moment startdate  add 2   hours        see the cloning  returned endate isSame expected enddate      true

User · Answer

I am working on an application in which we track live route  Passenger wants to show current position of driver and the expected arrival time to reach at his her location  So I need to add some duration into current time    So I found the below mentioned way to do the same  We can add any duration hour minutes and seconds  in our current time by moment   var travelTime   moment   add 642   seconds   format  hh mm A      it will add 642 seconds in the current time and will give time in 03 35 PM format  var travelTime   moment   add 11   minutes   format  hh mm A      it will add 11 mins in the current time and will give time in 03 35 PM format  can use m or minutes   var travelTime   moment   add 2   hours   format  hh mm A      it will add 2 hours in the current time and will give time in 03 35 PM format   It fulfills my requirement  May be it can help you

[javascript] Add a duration to a moment (moment.js)

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