convert 12-hour hh mm AM PM to 24-hour hh mm

Question

Is there any simple way to convert 12-hour hh mm AM PM to 24-hour hh mm using jquery   Note  not using any other libraries   I have a var time       starttime   val   that returns a hh mm AM PM

User · Answer

Tested for all the use cases

function timeConversion(s) {
let h24;
let m24;
let sec24;

const splittedDate = s.split(":");
const h = parseInt(splittedDate[0], 10);
const m = parseInt(splittedDate[1], 10);
const sec = parseInt(splittedDate[2][0] + splittedDate[2][1], 10); 
const meridiem = splittedDate[2][2] + splittedDate[2][3];

if (meridiem === "AM") {
    if (h === 12) {
        h24 = '00';
    } else {
        h24 = h;
        if (h24 < 10) {
            h24 = '0' + h24;
        }
    }
    m24 = m;
    sec24 = sec;
} else if (meridiem === "PM") {
    if (h === 12) {
        h24 = h
    } else {
        h24 = h + 12;
        if (h24 < 10) {
            h24 = '0' + h24;
        }
    }
    m24 = m;
    sec24 = sec;
}


if (m24 < 10) {
    m24 = '0' + m24; 
} 

if (sec24 < 10) {
    sec24 = '0' + sec24;
}

  return h24 + ":" + m24 + ":" + sec24; 
}

Here is the jsfiddle working example

User · Answer

I just solved this issue on HackerRank  so I m here to share my result  function timeConversion s        const isPM   s indexOf  PM       -1      let  hours  minutes  seconds    s replace isPM    PM   AM       split            if  isPM            hours   parseInt hours  10    12          hours   hours     24   12   hours        else           hours   parseInt hours  10           hours   hours     12   0   hours          if  String hours  length     1  hours    0    hours             const time    hours  minutes  seconds  join            return time      This works for inputs like 06 40 03AM

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In case you re looking for a solution that converts ANY FORMAT to 24 hours HH MM correctly   function get24hTime str       str   String str  toLowerCase   replace   s g           var has am   str indexOf  am    gt   0      var has pm   str indexOf  pm    gt   0         first strip off the am pm  leave it either hour or hour minute     str   str replace  am       replace  pm               if hour  convert to hour 00     if  str indexOf       lt  0  str   str     00          now it s hour minute        we add am pm back if striped out before      if  has am  str      am       if  has pm  str      pm          now its either hour minute  or hour minute am pm        put it in a date object  it will convert to 24 hours format for us      var d   new Date  1 1 2011     str          make hours and minutes double digits     var doubleDigits   function n           return  parseInt n   lt  10     0    n   String n              return doubleDigits d getHours            doubleDigits d getMinutes        console log get24hTime  6        06 00 console log get24hTime  6am        06 00 console log get24hTime  6pm        18 00 console log get24hTime  6 11pm        18 11 console log get24hTime  6 11        06 11 console log get24hTime  18        18 00 console log get24hTime  18 11        18 11

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This will help        function getTwentyFourHourTime amPmString             var d   new Date  1 1 2013     amPmString            return d getHours           d getMinutes             Example    getTwentyFourHourTime  8 45 PM        20 45  getTwentyFourHourTime  8 45 AM        8 45    Update   Note   There should be a space for timestring between  Time  and  am pm

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function getDisplayDatetime         var d   new Date  February 04  2011 19 00         hh   d getHours     mm   d getMinutes     dd    AM   h   hh      mm  mm toString   length    1   mm    0    mm mm      h  h gt  12  hh-12 h       dd  hh gt  12   PM   AM       h  h    0  12 h      var textvalue document getElementById  txt        textvalue value h         mm         dd      lt  script gt   lt  head gt   lt body gt   lt input type  button  value  click  onclick  getDisplayDatetime    gt   lt input type  text  id  txt   gt

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For anybody reading this in the future  here is a simpler answer   var s    11 41 02PM   var time   s match   d 2  g   if  time 0       12   time 0     00   if  s indexOf  PM    gt  -1  time 0    parseInt time 0   12  return time join

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Hope it helps someone         Complete the timeConversion function below      function timeConversion s                  Write your code here              if s endsWith  PM    s s substring 0  s indexOf  PM       PM       if s endsWith  AM    s s substring 0  s indexOf  AM       AM        const d new Date  2000-01-01     s        if s endsWith  PM    amp  amp  d getHours   lt 12  d setHours 12        if s endsWith  AM    amp  amp  d getHours     12  d setHours d getHours  -12         let result   d getHours    lt  10     0    d getHours    d getHours                  d getMinutes    lt 10    0   d getMinutes    d getMinutes                      d getSeconds    lt 10    0   d getSeconds    d getSeconds          return result      timeConversion  07 05 45PM   Sample Test Case Input 07 05 45PM Expected Output 19 05 45

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Here my solution including seconds   function convert to 24h time str           Convert a string like 10 05 23 PM to 24h format  returns like  22 5 23      var time   time str match    d     d     d     w         var hours   Number time 1        var minutes   Number time 2        var seconds   Number time 3        var meridian   time 4  toLowerCase         if  meridian     p   amp  amp  hours  lt  12          hours    12            else if  meridian     a   amp  amp  hours    12          hours -  12            return  hours  minutes  seconds

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You could try this more generic function   function from12to24 hours  minutes  meridian      let h   parseInt hours  10     const m   parseInt minutes  10     if  meridian toUpperCase        PM         h    h     12    h   12   h      else       h    h     12    0   h        return new Date  new Date    setHours h m 0 0           Note it uses some ES6 functionality

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An extended version of  krzysztof answer with the ability to work on time that has space or not between time and modifier    const convertTime12to24    time12h    gt          const  fullMatch  time  modifier    time12h match    d  d  d d  s   w 2   i          let  hours  minutes    time split              if  hours      12             hours    00                  if  modifier      PM             hours   parseInt hours  10    12                 return    hours    minutes               console log convertTime12to24  01 02 PM         console log convertTime12to24  05 06 PM         console log convertTime12to24  12 00 PM         console log convertTime12to24  12 00 AM

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This question needs a newer answer      x000D   x000D  const convertTime12to24    time12h    gt    x000D    const  time  modifier    time12h split       x000D   x000D    let  hours  minutes    time split       x000D   x000D    if  hours      12     x000D      hours    00   x000D      x000D   x000D    if  modifier      PM     x000D      hours   parseInt hours  10    12  x000D      x000D   x000D    return    hours    minutes    x000D    x000D   x000D  console log convertTime12to24  01 02 PM     x000D  console log convertTime12to24  05 06 PM     x000D  console log convertTime12to24  12 00 PM     x000D  console log convertTime12to24  12 00 AM     x000D   x000D   x000D

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i must recommend a library  Moment  code    var target12    2016-12-08 9 32 45 PM   console log moment target12   YYYY-MM-DD h m s A   format  YYYY-MM-DD HH mm ss

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function convertTo24Hour time        time   time toUpperCase        var hours   parseInt time substr 0  2        if time indexOf  AM      -1  amp  amp  hours    12            time   time replace  12    0              if time indexOf  PM       -1  amp  amp  hours  lt  12            time   time replace hours   hours   12              return time replace   AM PM

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x000D   x000D  convertTime12to24    time12h    gt    x000D          const  time  modifier    time12h split       x000D          let  hours  minutes    time split       x000D           hours      12    hours    00      modifier      PM     modifier      pm     hours   parseInt hours  10    12         x000D          return    hours    minutes    x000D          x000D         x000D         x000D         console log convertTime12to24  06 30 pm     x000D         x000D   lt script src  https   cdnjs cloudflare com ajax libs jquery 3 3 1 jquery min js  gt  lt  script gt  x000D   x000D   x000D

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Typescript solution based off of  krzysztof-dabrowski  s answer  export interface HoursMinutes     hours  number    minutes  number    export function convert12to24 time12h  string   HoursMinutes     const  time  modifier    time12h split         let  hours  minutes    time split          if  hours      12         hours    00          if  minutes length     1        minutes    0  minutes           if  modifier toUpperCase        PM         hours   parseInt hours  10    12              return       hours  parseInt hours  10       minutes  parseInt minutes  10

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x000D   x000D  function formatto24 date    x000D    let ampm   date split      1   x000D    let time   date split      0   x000D    if  ampm     PM     x000D      let hours   time split      0   x000D      let minutes   time split      1   x000D      let seconds   time split      2   x000D      let hours24   JSON parse hours    12  x000D      return hours24         minutes         seconds  x000D      else   x000D      return time  x000D      x000D    x000D   x000D   x000D

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single and easy js function for calc time meridian in real time  JS       function convertTime24to12 time24h                    var timex   time24h split                        if timex 0      undefined  amp  amp  timex  1      undefined                                          var hor   parseInt timex 0    gt  12    parseInt timex 0  -12    timex 0                         var minu   timex 1                        var merid   parseInt timex 0    lt  12    AM     PM                         var res   hor     minu     merid                        document getElementById  timeMeridian   innerHTML res toString                                       Html    lt label for  end-time  gt Hour  lt i id  timeMeridian  gt  lt  i gt   lt  label gt               lt input type  time  name  hora  placeholder  Hora  id  end-time  class  form-control  onkeyup  convertTime24to12 this value   gt

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I had to do something similar but I was generating a Date object so I ended up making a function like this   function convertTo24Hour time        var hours   parseInt time substr 0  2        if time indexOf  am      -1  amp  amp  hours    12            time   time replace  12    0              if time indexOf  pm       -1  amp  amp  hours  lt  12            time   time replace hours   hours   12              return time replace   am pm             I think this reads a little easier   You feed a string in the format h mm am pm       var time   convertTo24Hour     starttime   val   toLowerCase         var date   new Date     startday   val           time     Examples               startday   val  7 10 2013                 starttime   val  12 00am            new Date     startday   val           convertTo24Hour     starttime   val   toLowerCase              Wed Jul 10 2013 00 00 00 GMT-0700  PDT               starttime   val  12 00pm            new Date     startday   val           convertTo24Hour     starttime   val   toLowerCase              Wed Jul 10 2013 12 00 00 GMT-0700  PDT               starttime   val  1 00am            new Date     startday   val           convertTo24Hour     starttime   val   toLowerCase              Wed Jul 10 2013 01 00 00 GMT-0700  PDT               starttime   val  12 12am            new Date     startday   val           convertTo24Hour     starttime   val   toLowerCase              Wed Jul 10 2013 00 12 00 GMT-0700  PDT               starttime   val  3 12am            new Date     startday   val           convertTo24Hour     starttime   val   toLowerCase              Wed Jul 10 2013 03 12 00 GMT-0700  PDT               starttime   val  9 12pm            new Date     startday   val           convertTo24Hour     starttime   val   toLowerCase              Wed Jul 10 2013 21 12 00 GMT-0700  PDT

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Short ES6 code  const convertFrom12To24Format    time12    gt      const  sHours  minutes  period    time12 match    0-9  1 2     0-9  2    AM PM    slice 1     const PM   period      PM     const hours     sHours   12     PM   12   0      return      0    hours  slice -2     minutes        const convertFrom24To12Format    time24    gt      const  sHours  minutes    time24 match    0-9  1 2     0-9  2     slice 1     const period    sHours  lt  12    AM     PM     const hours    sHours   12    12     return    hours    minutes    period

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var time    9 09 59AM      var pmCheck  time includes  PM        var hrs parseInt time split      0        var newtime            this is for between  12 AM to 12 59 59AM    00 00 00     if  hrs    12   amp  amp  pmCheck    false           newtime   00        time split      1        time split      2  replace  AM                       this is for between  12 PM to 12 59 59  12 00 00     else if  hrs    12   amp  amp  pmCheck    true                newtime   12        time split      1        time split      2  replace  PM                   this is for between 1 AM and 11 59 59 AM     else if   pmCheck           newtime  hrs       time split      1        time split      2  replace  AM                   this is for between 1 PM and 11 59 59 PM     else if pmCheck           newtime   hrs  12       time split      1        time split      2  replace  PM                 console log newtime

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dateFormat masks armyTime   HH MM    now format  armyTime

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Converting AM PM Time string to 24 Hours Format  Example 9 30 PM to 21 30 function get24HrsFrmAMPM timeStr        if  timeStr  amp  amp  timeStr indexOf          -1  amp  amp  timeStr indexOf          -1            var hrs   0          var tempAry   timeStr split               var hrsMinAry   tempAry 0  split               hrs   parseInt hrsMinAry 0   10           if   tempAry 1      AM     tempAry 1      am    amp  amp  hrs    12                hrs   0            else if   tempAry 1      PM     tempAry 1      pm    amp  amp  hrs    12                hrs    12                    return   0    hrs  slice -2            0    parseInt hrsMinAry 1   10   slice -2         else           return null

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I needed this function for a project  I tried devnull69 s but I was having some trouble  mostly because the string input is very specific for the am pm section and I would ve needed to change my validation  I messed around with Adrian P  s jsfiddle and ended up with a version that seems to work better for a larger variety of date formats  Here is the fiddle  http   jsfiddle net u91q8kmt 2    Here is the function   function ConvertTimeformat format  str        var hours   Number str match     d     1        var minutes   Number str match     d     1        var AMPM   str match   s   AaPp  Mm       1       var pm     P    p    PM    pM    pm    Pm        var am     A    a    AM    aM    am    Am        if  pm indexOf AMPM   gt   0  amp  amp  hours  lt  12  hours   hours   12      if  am indexOf AMPM   gt   0  amp  amp  hours    12  hours   hours - 12      var sHours   hours toString        var sMinutes   minutes toString        if  hours  lt  10  sHours    0    sHours      if  minutes  lt  10  sMinutes    0    sMinutes      if  format     0000             return  sHours   sMinutes         else if  format     00 00             return  sHours         sMinutes         else           return false

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Try this  var time       starttime   val    var hours   Number time match     d     1    var minutes   Number time match     d     1    var AMPM   time match   s        1   if AMPM     PM   amp  amp  hours lt 12  hours   hours 12  if AMPM     AM   amp  amp  hours  12  hours   hours-12  var sHours   hours toString    var sMinutes   minutes toString    if hours lt 10  sHours    0    sHours  if minutes lt 10  sMinutes    0    sMinutes  alert sHours         sMinutes

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include  lt bits stdc   h gt   using namespace std   int main        string time      int hours seconds minutes      string merid      char delim      stringstream ss       cin  gt  gt  time      ss  lt  lt  time      ss  gt  gt  hours  gt  gt  delim  gt  gt  minutes  gt  gt  delim  gt  gt  seconds  gt  gt  merid       if  merid   PM  amp  amp hours  12    merid   AM  amp  amp hours  12           hours  hours 12  24       printf   02d  02d  02d   hours  minutes  seconds        return 0

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I ve created a bit of an adaptation of script  devnull69 submitted  I felt for my application it would be more useful as a function that returned the value that I could  then use as a variable   HTML   lt input type  text  id  time field    gt   lt button gt Submit lt  submit gt    jQuery    document  ready function          function convertTime time             var hours   Number time match     d d     1            var minutes   Number time match     d d     1            var AMPM   time match   s AM PM   i  1            if  AMPM     PM     AMPM     pm    amp  amp  hours  lt  12                hours   hours   12                    else if  AMPM     AM     AMPM     am    amp  amp  hours    12                hours   hours - 12                     var sHours   hours toString            var sMinutes   minutes toString             if hours  lt  10                sHours    0    sHours                    else if minutes  lt  10                 sMinutes    0    sMinutes                     return sHours         sMinutes                 button   click function             alert convertTime     time field   val

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With this you can have the following  Sample Input  07 05 45PM Sample Output  19 05 45  function timeConversion s        let output           const timeSeparator           const timeTokenType   s substr s length - 2   2  toLowerCase        const timeArr   s split timeSeparator  map  timeToken    gt        const isTimeTokenType              timeToken toLowerCase   indexOf  am    gt  0                                                                                                              timeToken toLowerCase   indexOf  pm            if isTimeTokenType               return timeToken substr 0  2             else               return timeToken                        const hour   timeArr 0       const minutes   timeArr 1       const seconds   timeArr 2       const hourIn24    timeTokenType      am     parseInt hour  - 12        parseInt hour    12      return hourIn24 toString    timeSeparator   minutes   timeSeparator   seconds      Hope you like it

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based on meeting CodeSkill  1  validation of format should be another function      x000D   x000D     x000D   x000D  function convertTimeFrom12To24 timeStr    x000D    var colon   timeStr indexOf       x000D    var hours   timeStr substr 0  colon   x000D        minutes   timeStr substr colon 1  2   x000D        meridian   timeStr substr colon 4  2  toUpperCase    x000D    x000D     x000D    var hoursInt   parseInt hours  10   x000D        offset   meridian     PM    12   0  x000D     x000D    if  hoursInt     12    x000D      hoursInt   offset  x000D      else   x000D      hoursInt    offset  x000D      x000D    return hoursInt         minutes  x000D    x000D  console log convertTimeFrom12To24  12 00 AM     x000D  console log convertTimeFrom12To24  12 00 PM     x000D  console log convertTimeFrom12To24  11 00 AM     x000D  console log convertTimeFrom12To24  01 00 AM     x000D  console log convertTimeFrom12To24  01 00 PM     x000D   x000D   x000D

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date --date  2 00 01 PM    T 14 00 01  date --date  2 00 PM    T   cut -d    -f1-2 14 00  var  2 00 02 PM  date --date   var    T 14 00 02

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function timeConversion s      var time   s toLowerCase   split         var hours   parseInt time 0      var  ampm   time 2     if   ampm indexOf  am      -1  amp  amp  hours    12        time 0     00         if   ampm indexOf  pm       -1  amp  amp  hours  lt  12        time 0    hours   12        return time join      replace   am pm             Call the function with string params   timeConversion  17 05 45AM     or  timeConversion  07 05 45PM

[javascript] convert 12-hour hh:mm AM/PM to 24-hour hh:mm

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