Convert HH MM SS string to seconds only in javascript

Question

I am having similar requirement as this  Convert time in HH MM SS format to seconds only   but in javascript  I have seen many examples of converting seconds into different formats but not HH MM SS into seconds  Any help would be appreciated

User · Answer

try  time  12 12 12   tt time split       sec tt 0  3600 tt 1  60 tt 2  1

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Here is maybe a bit more readable form on the original approved answer   const getSeconds    hms  string    number   gt      const  hours  minutes  seconds    hms split         return   hours    60   60     minutes    60     seconds

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You can do this dynamically - in case you encounter not only  HH mm ss  but also  mm ss  or even ss alone   var str    12 99 07   var times   str split       times reverse    var x   times length  y   0  z  for  var i   0  i  lt  x  i          z   times i    Math pow 60  i       y    z    console log y

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This function handels  HH MM SS  as well as  MM SS  or  SS    function hmsToSecondsOnly str        var p   str split               s   0  m   1       while  p length  gt  0            s    m   parseInt p pop    10           m    60             return s

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x000D   x000D  function parsehhmmsst arg    x000D   var result   0  arr   arg split      x000D   if  arr 0   lt  12    x000D    result   arr 0    3600    hours x000D     x000D   result    arr 1    60    minutes x000D   result    parseInt arr 2      seconds x000D   if  arg indexOf  P    gt  -1        8 00 PM  gt  8 00 AM x000D    result    43200 x000D     x000D   return result x000D    x000D     body   append parsehhmmsst  12 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  1 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  2 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  3 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  4 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  5 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  6 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  7 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  8 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  9 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  10 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  11 00 00 AM       lt br gt    x000D     body   append parsehhmmsst  12 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  1 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  2 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  3 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  4 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  5 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  6 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  7 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  8 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  9 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  10 00 00 PM       lt br gt    x000D     body   append parsehhmmsst  11 00 00 PM       lt br gt    x000D   lt script src  https   ajax googleapis com ajax libs jquery 2 1 1 jquery min js  gt  lt  script gt  x000D   x000D   x000D

User · Answer

Javascript s static method Date UTC   does the trick   alert getSeconds  00 22 17      function getSeconds time        var ts   time split           return Date UTC 1970  0  1  ts 0   ts 1   ts 2     1000

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Try this   var hms    02 04 33        your input string var a   hms split          split it at the colons     minutes are worth 60 seconds  Hours are worth 60 minutes  var seconds     a 0     60   60     a 1     60     a 2      console log seconds

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Convert hh mm ss string to seconds in one line  Also allowed h m s format and mm ss  m s etc   08 45 20  split      reverse   reduce  prev  curr  i    gt  prev   curr Math pow 60  i   0

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Since the getTime function of the Date object gets the milliseconds since 1970 01 01  we can do this    var time    12 23 00   var seconds   new Date  1970-01-01T    time    Z   getTime     1000

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This can be done quite resiliently with the following    01 02 03  split      reduce  acc time    gt   60   acc     time     This is because each unit of time within the hours  minutes and seconds is a multiple of 60 greater than the smaller unit   Time is split into hour minutes and seconds components  then reduced to seconds by using the accumulated value of the higher units multiplied by 60 as it goes through each unit   The   time is used to cast the time to a number   It basically ends up doing   60     60   HHHH    MM     SS  If only seconds is passed then the result would be a string  so to fix that we could cast the entire result to an int      03  split      reduce  acc time    gt   60   acc     time

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new Date moment  23 04 33    HH mm    getTime     Output  1499755980000  in millisecond                 1499755980000 1000   in second   Note   this output calculate diff from 1970-01-01 12 0 0 to now         and we need to implement the moment js

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This function works for MM SS as well    x000D   x000D  const convertTime    hms    gt    x000D          if  hms length  lt 3   x000D           return hms x000D            else if  hms length  lt 6   x000D            const a   hms split      x000D            return hms     a 0     60     a 1   x000D            else   x000D            const a   hms split      x000D            return hms     a 0     60   60     a 1     60     a 2   x000D            x000D          x000D   x000D   x000D

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Taken from the solution given by Paul https   stackoverflow com a 45292588 1191101 but using the old function notation so it can also be used in other js engines  e g   java Rhino   function strToSeconds  stime       return   stime split      reduce function  acc time    return   60   acc     time          or just this one more readable  function strToSeconds  stime      var tt   stime split      reverse       return   tt length  gt   3      tt 2    0  60 60               tt length  gt   2      tt 1    0  60               tt length  gt   1      tt 0    0

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This is the most clear  easy to understand solution   x000D   x000D  function convertDurationtoSeconds duration       const  hours  minutes  seconds    duration split           return Number hours    60   60   Number minutes    60   Number seconds       const input    01 30 45   const output   convertDurationtoSeconds input   console log    input  is   output  in seconds    x000D   x000D   x000D

[javascript] Convert HH:MM:SS string to seconds only in javascript

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