Javascript Date next month

Question

I ve been using Javascript s Date for a project  but noticed today that my code that previously worked is no longer working correctly  Instead of producing Feb as expected  the code below produces March    My code looks something like this    current   new Date    current setMonth current getMonth   1     If today is Jan  expect it to be Feb now   This code worked everyday up until today  Is this a Javascript bug or am I going about this the wrong way

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If you are able to get your hands on date-fns library v2   you can import the function addMonths  and use that to get the next month  x000D   x000D   lt script type  module  gt    import   addMonths   from  https   cdn jsdelivr net npm date-fns  esm         const current   new Date      const nextMonth   addMonths current  1     console log  Next month is   nextMonth      lt  script gt  x000D   x000D   x000D

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If you use moment js  they have an add function  Here s the link -  https   momentjs com docs   manipulating add   moment   add 7   months      I also wrote a recursive function based on paxdiablo s answer to add a variable number of months  By default this function would add a month to the current date    function addMonths after   1  now   new Date              var current          if  now getMonth      11                current   new Date now getFullYear     1  0  1             else               current   new Date now getFullYear    now getMonth     1  1                                 return  after    1    current   addMonths after - 1  new Date now getFullYear    now getMonth     1  1           Example   console log  Add 3 months to November   addMonths 3  new Date 2017  10  27      Output -   Add 3 months to November Thu Feb 01 2018 00 00 00 GMT-0800  Pacific Standard Time

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You may probably do this way  var currentMonth   new Date   getMonth     var monthNames     January    February    March    April    May    June      July    August    September    October    November    December      for var i   currentMonth-1   i lt   4  i     console log monthNames i     make it as an array of objects here

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try this   var a   screen Data getFullYear    var m   screen Data getMonth    var d   screen Data getDate     m   m   1  screen Data   new Date a  m  d    if  screen Data getDate      d  screen Data   new Date a  m   1  0

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You ll probably find you re setting the date to Feb 31  2009  if today is Jan 31  and Javascript automagically rolls that into the early part of March   Check the day of the month  I d expect it to be 1  2 or 3  If it s not the same as before you added a month  roll back by one day until the month changes again   That way  the day  last day of Jan  becomes  last day of Feb    EDIT   Ronald  based on your comments to other answers  you might want to steer clear of edge-case behavior such as  what happens when I try to make Feb 30  or  what happens when I try to make 2009 13 07  yyyy mm dd    that last one might still be a problem even for my solution  so you should test it    Instead  I would explicitly code for the possibilities  Since you don t care about the day of the month  you just want the year and month to be correct for next month   something like this should suffice   var now   new Date    if  now getMonth      11        var current   new Date now getFullYear     1  0  1     else       var current   new Date now getFullYear    now getMonth     1  1       That gives you Jan 1 the following year for any day in December and the first day of the following month for any other day   More code  I know  but I ve long since grown tired of coding tricks for efficiency  preferring readability unless there s a clear requirement to do otherwise

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You can use the date js library   http   code google com p datejs   And just do this  Date today   next   month      You will have the exact value for today   1 month  including days

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You can use the date js library   http   code google com p datejs   And just do this  Date today   next   month      You will have the exact value for today   1 month  including days

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You ll probably find you re setting the date to Feb 31  2009  if today is Jan 31  and Javascript automagically rolls that into the early part of March   Check the day of the month  I d expect it to be 1  2 or 3  If it s not the same as before you added a month  roll back by one day until the month changes again   That way  the day  last day of Jan  becomes  last day of Feb    EDIT   Ronald  based on your comments to other answers  you might want to steer clear of edge-case behavior such as  what happens when I try to make Feb 30  or  what happens when I try to make 2009 13 07  yyyy mm dd    that last one might still be a problem even for my solution  so you should test it    Instead  I would explicitly code for the possibilities  Since you don t care about the day of the month  you just want the year and month to be correct for next month   something like this should suffice   var now   new Date    if  now getMonth      11        var current   new Date now getFullYear     1  0  1     else       var current   new Date now getFullYear    now getMonth     1  1       That gives you Jan 1 the following year for any day in December and the first day of the following month for any other day   More code  I know  but I ve long since grown tired of coding tricks for efficiency  preferring readability unless there s a clear requirement to do otherwise

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Instead  try   var now   new Date    current   new Date now getFullYear    now getMonth   1  1

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I was looking for a simple one-line solution to get the next month via math so I wouldn t have to look up the javascript date functions  mental laziness on my part   Quite strangely  I didn t find one here   I overcame my brief bout of laziness  wrote one  and decided to share   Solution    new Date   getMonth   1  12   1     Just to be clear why this works  let me break down the magic   It gets the current month  which is in 0  11 format   increments by 1 for the next month  and wraps it to a boundary of 12 via modulus  11 12  11  12 12  0   This returns the next month in the same 0  11 format  so converting to a format Date   will recognize  1  12  is easy  simply add 1 again   Proof of concept    gt  for var m 0 m lt  11 m      console info   next month for  i   i   m 1   m 1  12   1     next month for 1  2 next month for 2  3 next month for 3  4 next month for 4  5 next month for 5  6 next month for 6  7 next month for 7  8 next month for 8  9 next month for 9  10 next month for 10  11 next month for 11  12 next month for 12  1   So there you have it

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ah  the beauty of ternaries   const now   new Date    const expiry   now getMonth      11   new Date now getFullYear   1  0   1    new Date now getFullYear    now getMonth     1  1     just a simpler version of the solution provided by  paxdiablo and  Tom

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You ll probably find you re setting the date to Feb 31  2009  if today is Jan 31  and Javascript automagically rolls that into the early part of March   Check the day of the month  I d expect it to be 1  2 or 3  If it s not the same as before you added a month  roll back by one day until the month changes again   That way  the day  last day of Jan  becomes  last day of Feb    EDIT   Ronald  based on your comments to other answers  you might want to steer clear of edge-case behavior such as  what happens when I try to make Feb 30  or  what happens when I try to make 2009 13 07  yyyy mm dd    that last one might still be a problem even for my solution  so you should test it    Instead  I would explicitly code for the possibilities  Since you don t care about the day of the month  you just want the year and month to be correct for next month   something like this should suffice   var now   new Date    if  now getMonth      11        var current   new Date now getFullYear     1  0  1     else       var current   new Date now getFullYear    now getMonth     1  1       That gives you Jan 1 the following year for any day in December and the first day of the following month for any other day   More code  I know  but I ve long since grown tired of coding tricks for efficiency  preferring readability unless there s a clear requirement to do otherwise

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You may probably do this way  var currentMonth   new Date   getMonth     var monthNames     January    February    March    April    May    June      July    August    September    October    November    December      for var i   currentMonth-1   i lt   4  i     console log monthNames i     make it as an array of objects here

User · Answer

If you use moment js  they have an add function  Here s the link -  https   momentjs com docs   manipulating add   moment   add 7   months      I also wrote a recursive function based on paxdiablo s answer to add a variable number of months  By default this function would add a month to the current date    function addMonths after   1  now   new Date              var current          if  now getMonth      11                current   new Date now getFullYear     1  0  1             else               current   new Date now getFullYear    now getMonth     1  1                                 return  after    1    current   addMonths after - 1  new Date now getFullYear    now getMonth     1  1           Example   console log  Add 3 months to November   addMonths 3  new Date 2017  10  27      Output -   Add 3 months to November Thu Feb 01 2018 00 00 00 GMT-0800  Pacific Standard Time

User · Answer

Instead  try   var now   new Date    current   new Date now getFullYear    now getMonth   1  1

User · Answer

If you are able to get your hands on date-fns library v2   you can import the function addMonths  and use that to get the next month  x000D   x000D   lt script type  module  gt    import   addMonths   from  https   cdn jsdelivr net npm date-fns  esm         const current   new Date      const nextMonth   addMonths current  1     console log  Next month is   nextMonth      lt  script gt  x000D   x000D   x000D

User · Answer

ah  the beauty of ternaries   const now   new Date    const expiry   now getMonth      11   new Date now getFullYear   1  0   1    new Date now getFullYear    now getMonth     1  1     just a simpler version of the solution provided by  paxdiablo and  Tom

User · Answer

I was looking for a simple one-line solution to get the next month via math so I wouldn t have to look up the javascript date functions  mental laziness on my part   Quite strangely  I didn t find one here   I overcame my brief bout of laziness  wrote one  and decided to share   Solution    new Date   getMonth   1  12   1     Just to be clear why this works  let me break down the magic   It gets the current month  which is in 0  11 format   increments by 1 for the next month  and wraps it to a boundary of 12 via modulus  11 12  11  12 12  0   This returns the next month in the same 0  11 format  so converting to a format Date   will recognize  1  12  is easy  simply add 1 again   Proof of concept    gt  for var m 0 m lt  11 m      console info   next month for  i   i   m 1   m 1  12   1     next month for 1  2 next month for 2  3 next month for 3  4 next month for 4  5 next month for 5  6 next month for 6  7 next month for 7  8 next month for 8  9 next month for 9  10 next month for 10  11 next month for 11  12 next month for 12  1   So there you have it

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You ll probably find you re setting the date to Feb 31  2009  if today is Jan 31  and Javascript automagically rolls that into the early part of March   Check the day of the month  I d expect it to be 1  2 or 3  If it s not the same as before you added a month  roll back by one day until the month changes again   That way  the day  last day of Jan  becomes  last day of Feb    EDIT   Ronald  based on your comments to other answers  you might want to steer clear of edge-case behavior such as  what happens when I try to make Feb 30  or  what happens when I try to make 2009 13 07  yyyy mm dd    that last one might still be a problem even for my solution  so you should test it    Instead  I would explicitly code for the possibilities  Since you don t care about the day of the month  you just want the year and month to be correct for next month   something like this should suffice   var now   new Date    if  now getMonth      11        var current   new Date now getFullYear     1  0  1     else       var current   new Date now getFullYear    now getMonth     1  1       That gives you Jan 1 the following year for any day in December and the first day of the following month for any other day   More code  I know  but I ve long since grown tired of coding tricks for efficiency  preferring readability unless there s a clear requirement to do otherwise

User · Answer

try this   var a   screen Data getFullYear    var m   screen Data getMonth    var d   screen Data getDate     m   m   1  screen Data   new Date a  m  d    if  screen Data getDate      d  screen Data   new Date a  m   1  0

User · Answer

Instead  try   var now   new Date    current   new Date now getFullYear    now getMonth   1  1

User · Answer

Instead  try   var now   new Date    current   new Date now getFullYear    now getMonth   1  1

[javascript] Javascript Date: next month

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