Moment JS start and end of given month

Question

I need to calculate a JS date given year 2014 and month 9  September 2014    I tried this   var moment   require  moment    var startDate   moment  year  -  month  -  01     00 00 00                 var endDate   startDate endOf  month                console log startDate toDate                 console log endDate toDate       Both of logs show   Tue Sep 30 2014 23 59 59 GMT 0200  CEST  Tue Sep 30 2014 23 59 59 GMT 0200  CEST    End date is correct but    why the start date is not

User · Answer

When you use  endOf   you are mutating the object it s called on  so startDate becomes Sep 30  You should use  clone   to make a copy of it instead of changing it  var startDate   moment year    -    month    -    01     00 00 00                var endDate   startDate clone   endOf  month                console log startDate toDate                 console log endDate toDate      Mon Sep 01 2014 00 00 00 GMT 0700  ICT   Tue Sep 30 2014 23 59 59 GMT 0700  ICT

User · Answer

x000D   x000D  const year   2014  x000D  const month   09  x000D   x000D     months start at index 0 in momentjs  so we subtract 1 x000D  const startDate   moment  year  month - 1  01   format  YYYY-MM-DD    x000D   x000D     get the number of days for this month x000D  const daysInMonth   moment startDate  daysInMonth    x000D   x000D     we are adding the days in this month to the start date  minus the first day  x000D  const endDate   moment startDate  add daysInMonth - 1   days   format  YYYY-MM-DD    x000D   x000D  console log  start date    startDate     x000D  console log  end date      endDate     x000D   lt script x000D  src  https   cdnjs cloudflare com ajax libs moment js 2 20 1 moment min js  gt  x000D   lt  script gt  x000D   x000D   x000D

User · Answer

Try the following code   const moment require  moment    console log  startDate  gt   moment   startOf  month   format  YYYY-DD-MM     console log  endDate  gt   moment   endOf  month   format  YYYY-DD-MM

User · Answer

var d   new moment    var startMonth   d clone   startOf  month    var endMonth   d clone   endOf  month    console log startMonth  endMonth     doc

User · Answer

you can use this directly for the end or start date of the month  new moment   startOf  month   format  YYYY-DD-MM    new moment   endOf  month   format  YYYY-DD-MM      you can change the format by defining a new format

User · Answer

Try the following code   moment startDate  startOf  months   moment startDate  endOf  months

User · Answer

The following code should work       reportrange   daterangepicker                   startDate  start                  endDate  end                  ranges                         Hoy    moment    moment                          Ayer    moment   subtract 1   days    moment   subtract 1   days                          Ultimos 7 dias    moment   subtract 6   days    moment                          Ultimos 30 dias    moment   subtract 29   days    moment                          Mes actual    moment   startOf  month    moment   endOf  month                          Ultimo mes    moment   subtract 1   month   startOf  month    moment   subtract 1   month   endOf  month                          Enero    moment   month 0  startOf  month     moment   month 0  endOf  month                          Febrero    moment   month 1  startOf  month     moment   month 1  endOf  month                          Marzo    moment   month 2  startOf  month     moment   month 2  endOf  month                          Abril    moment   month 3  startOf  month     moment   month 3  endOf  month                          Mayo    moment   month 4  startOf  month     moment   month 4  endOf  month                          Junio    moment   month 5  startOf  month     moment   month 5  endOf  month                          Julio    moment   month 6  startOf  month     moment   month 6  endOf  month                          Agosto    moment   month 7  startOf  month     moment   month 7  endOf  month                          Septiembre    moment   month 8  startOf  month     moment   month 8  endOf  month                          Octubre    moment   month 9  startOf  month     moment   month 9  endOf  month                          Noviembre    moment   month 10  startOf  month     moment   month 10  endOf  month                          Diciembre    moment   month 11  startOf  month     moment   month 11  endOf  month                                     cb

User · Answer

your startDate is first-day-of-month  In this case we can use  var endDate   moment startDate  add 1   months   subtract 1   days      Hope this helps

User · Answer

That s because endOf mutates the original value   Relevant quote      Mutates the original moment by setting it to the end of a unit of time    Here s an example function that gives you the output you want   function getMonthDateRange year  month        var moment   require  moment            month in moment is 0 based  so 9 is actually october  subtract 1 to compensate        array is  year    month    day   etc     var startDate   moment  year  month - 1            Clone the value before  endOf       var endDate   moment startDate  endOf  month            just for demonstration      console log startDate toDate         console log endDate toDate             make sure to call toDate   for plain JavaScript date type     return   start  startDate  end  endDate        References    endOf   clone   Date from object

User · Answer

const dates   getDatesFromDateRange  2014-05-02    2018-05-12    YYYY MM DD   1              console log dates      you get the whole from-to date ranges as per parameters var onlyStartDates   dates map dateObj   gt  dateObj  to     console log onlyStartDates      moreover  if you want only from dates then you can grab by  map  function  function getDatesFromDateRange  startDate  endDate  format  counter         startDate   moment startDate  format       endDate   moment endDate  format        let dates           let fromDate   startDate clone        let toDate   fromDate clone   add counter   month   startOf  month   add -1   day        do           dates push                from   fromDate format format                to     toDate  lt  endDate     toDate format format    endDate format format                      fromDate   moment toDate  format  add 1   day   clone            toDate   fromDate clone   add counter   month   startOf  month   add -1   day          while   fromDate  lt  endDate        return dates      Please note   clone   is essential in momentjs else it ll override the value  It seems in your case    It s more generic  to get bunch of dates that fall between dates

User · Answer

Don t really think there is some direct method to get the last day but you could do something like this   var dateInst   new moment           adding 1 month from the present month and then subtracting 1 day      So you would get the last day of this month      dateInst add 1   months   date 1  subtract 1   days       printing the last day of this month s date    console log dateInst format  YYYY MM DD

[javascript] Moment JS start and end of given month

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