PHP calculate age

Question

I m looking for a way to calculate the age of a person  given their DOB in the format dd mm yyyy   I was using the following function which worked fine for several months until some kind of glitch  caused the while loop to never end and grind the entire site to a halt  Since there are almost 100 000 DOBs going through this function several times a day  it s hard to pin down what was causing this   Does anyone have a more reliable way of calculating the age     replace   with - so strtotime works  dob   strtotime str replace      -   birthdayDate            tdate   time      age   0  while   tdate  gt   dob   strtotime   1 year    dob            age    return  age    EDIT  this function seems to work OK some of the time  but returns  40  for a DOB of 14 09 1986  return floor  time   - strtotime  birthdayDate   31556926

User · Answer

This function will return the age in years. Input value is a date formated (YYYY-MM-DD) day of birth string eg: 2000-01-01

It works with day - precision

function getAge($dob) {
    //calculate years of age (input string: YYYY-MM-DD)
    list($year, $month, $day) = explode("-", $dob);

    $year_diff  = date("Y") - $year;
    $month_diff = date("m") - $month;
    $day_diff   = date("d") - $day;

    // if we are any month before the birthdate: year - 1 
    // OR if we are in the month of birth but on a day 
    // before the actual birth day: year - 1
    if ( ($month_diff < 0 ) || ($month_diff === 0 && $day_diff < 0))
        $year_diff--;   

    return $year_diff;
}

Cheers, nira

User · Answer

Looking over the provided solutions I m always think about drawbacks of modern education in IT field  Most of the developers are forgetting that even modern CPU s suffer from executing conditional operators  while arithmetics operations  especially with powers of 2 are faster  So on the purpose I m showing this solution in PHP thread without any optimizations     list  year  month  day    explode  -   birthday      age floor   date  Y  - year  512  date  m  - month  32 date  d  - day  512     In other languages which have strict type definitions and capable replacing   and   by shifts  this formula will  fly   Also changing divisor you can calculate age in months  weeks  amp etc  Be carefull  the order of operands in differences is essential

User · Answer

date   new DateTime  bithdayDate     now   new DateTime      interval    now- gt diff  date    return  interval- gt y

User · Answer

If you can t seem to use some of the newer functions  here s something I whipped up  Probably more than you need  and I m sure there are better ways  but it s easy to read  so it should do the job   function get age  date   units  years          modifier   date  n   - date  n   strtotime  date     1    date  j   - date  j   strtotime  date     1   0        seconds    time  -strtotime  date         years    date  Y  -date  Y   strtotime  date  - modifier       switch  units                case  seconds               return  seconds          case  minutes               return round  seconds 60           case  hours               return round  seconds 60 60           case  days               return round  seconds 60 60 24           case  months               return   years 12 date  n             case  decades               return   years 10           case  centuries               return   years 100           case  years           default              return  years            Example Use   echo  I am   get age  September 19th  1984    days     days old     Hope this helps

User · Answer

If you want to only get fullyears as age  there is a supersimple way on doing that  treat dates formatted as  YYYYMMDD  as numbers and substract them  After that cancel out the MMDD part by dividing the result with 10000 and floor it down  Simple and never fails  even takes to account leapyears and your current server time    Since birthdays or mostly provided by full dates on birth location and they are relevant to CURRENT LOCAL TIME  where the age check is actually done    now   date  Ymd     birthday    19780917    september 17th  1978  age   floor   now- birthday  10000    so if you want to check if someone is 18 or 21 or below 100 on your timezone  nevermind the origin timezone  by birthday  this is my way to do this

User · Answer

replace   with - so strtotime works  dob   strtotime str replace      -   birthdayDate            tdate   time    return date  Y    tdate  - date  Y    dob

User · Answer

Ready to use function that returns full result  year  month  day  hour  min  sec    Regarding date above current date  it will return negative values that can be useful for countdown function      By default    format is  us    and delimiter is  -      function date calculate  input date   format    us    delimiter    -         switch  strtolower  format             case  us      date in  us  format  yyyy mm dd   like  1994 03 01              list  y   m   d    explode  delimiter   input date               break          case  fr      date in  fr  format  dd mm yyyy   like  01 03 1994              list  d   m   y    explode  delimiter   input date               break          default  return null              tz            new  DateTimeZone  UTC       TimeZone  Not required but can be useful  By default  server TimeZone will be returned      format date   sprintf   s- s- s    y   m   d        cur date      new  DateTime null   tz        user date     new  DateTime  format date   tz        interval       user date- gt diff  cur date        return            year     gt   interval- gt format   r y             month    gt   interval- gt format   r m             day      gt   interval- gt format   r d             hour     gt   interval- gt format   r H             min      gt   interval- gt format   r i             sec      gt   interval- gt format   r s              var dump date calculate  06 09 2016    fr          var dump date calculate  2016-09-06       More      DateInterval  format -  http   nl1 php net manual en dateinterval format php DateTime  diff -  http   nl1 php net manual en datetime diff php

User · Answer

If you want to caculate the Age of using the dob  you can also use this function   It uses the DateTime object   function calcutateAge  dob             dob   date  Y-m-d  strtotime  dob              dobObject   new DateTime  dob            nowObject   new DateTime              diff    dobObject- gt diff  nowObject            return  diff- gt y

User · Answer

Following the first logic  you have to use   in the comparison     lt  php      function age  birthdate             birthdate   strtotime  birthdate            now   time             age   0          while   now  gt     birthdate   strtotime   1 YEAR    birthdate                   age                      return  age                Usage       echo age implode  -  array reverse explode      14 09 1986          format yyyy-mm-dd is safe      echo age  -10 YEARS      without   in the comparison  will returns 9     gt

User · Answer

i18n    function getAge  birthdate   pattern    eu          patterns   array           eu       gt   d m Y            mysql    gt   Y-m-d            us       gt   m d Y                now        new DateTime         in         DateTime  createFromFormat  patterns  pattern    birthdate        interval    now- gt diff  in       return  interval- gt y        Usage echo getAge  05 29 1984    us       return 28

User · Answer

You can use the Carbon library  which is an API extension for DateTime   You can   function calculate age  date         date   new  Carbon Carbon  date       return  int   date- gt diffInYears        or    age    new  Carbon Carbon  date  - gt age

User · Answer

The top answer for this is OK but only calualtes the year a person was born  I tweaked it for my own purposes to work out the day and month  But thought it was worth sharing   This works by taken a timestamp of the the users DOB  but feel free to change that   birthDate   date  d-m-Y   usersDOBtimestamp    currentDate   date  d-m-Y   time       explode the date to get month  day and year  birthDate   explode  -    birthDate    currentDate   explode  -    currentDate    birthDate 0    ltrim  birthDate 0   0     currentDate 0    ltrim  currentDate 0   0      that gets a rough age  age    currentDate 2  -  birthDate 2     check if month has passed if  birthDate 1   gt   currentDate 1            user birthday has not passed        age    age - 1    else if  birthDate 1      currentDate 1             check if birthday is in current month       if  birthDate 0   gt   currentDate 0                 age - 1                 echo  age

User · Answer

Due to leap year  it is not wise just to subtract one date from another and floor it to number of years  To calculate the age like the humans  you will need something like this    birthday date    1977-04-01    age   date  Y   - substr  birthday date  0  4   if  strtotime date  Y-m-d    - strtotime date  Y     substr  birthday date  4  6    lt  0         age--

User · Answer

It is a problem when you use strtotime with DD MM YYYY  You cant use that format  Instead of it you can use MM DD YYYY  or many others like YYYYMMDD or YYYY-MM-DD  and it should work properly

User · Answer

here s the simple function to calculate age    lt  php     function age  birthDate           date in mm dd yyyy format  or it can be in other formats as well         explode the date to get month  day and year        birthDate   explode       birthDate           get age from date or birthdate        age    date  md   date  U   mktime 0  0  0   birthDate 0    birthDate 1    birthDate 2      gt  date  md               date  Y   -  birthDate 2   - 1             date  Y   -  birthDate 2          return  age               gt        lt  php     echo age  11 05 1991          gt

User · Answer

Here is the process that is more simple and works both for the formats dd mm yyyy and dd-mm-yyyy  This is working great for me        lt  php          birthday    26 04 1994            dob   strtotime str replace       -    birthday            tdate   time           echo date  Y    tdate  - date  Y    dob         gt    And if you care about your time zone just add above  date default timezone set  Asia Dhaka    change the zone with yours

User · Answer

If you don t need great precision  just the number of years  you could consider using the code below       print floor  time   - strtotime  1971-11-20       60 60 24 365      You only need to put this into a function and replace the date  1971-11-20  with a variable   Please note that precision of the code above is not high because of the leap years  i e  about every 4 years the days are 366 instead of 365  The expression 60 60 24 365 calculates the number of seconds in one year - you can replace it with 31536000   Another important thing is that because of the use of UNIX Timestamp it has both the Year 1901 and Year 2038 problem which means the the expression above will not work correctly for dates before year 1901 and after year 2038   If you can live with the limitations mentioned above that code should work for you

User · Answer

I have found this script reliable  It takes the date format as YYYY-mm-dd  but it could be modified for other formats pretty easily         Get age from dob    param        dob      string       The dob to validate in mysql format  yyyy-mm-dd     return            integer      The age in years as of the current date    function getAge  dob          calculate years of age  input string  YYYY-MM-DD      list  year   month   day    explode  -    dob         year diff    date  Y   -  year       month diff   date  m   -  month       day diff     date  d   -  day       if   day diff  lt  0     month diff  lt  0           year diff--       return  year diff

User · Answer

Simple method for calculating Age from dob     age   floor  time   - strtotime  1986-09-16      31556926     31556926 is the number of seconds in a year

User · Answer

Try this     lt  php    birth date   strtotime  1988-03-22       now   time       age    now- birth date     a    age 60 60 24 365 25    echo floor  a     gt

User · Answer

I did it like this    geboortedatum   1980-01-30 00 00 00  echo leeftijd  geboortedatum    function leeftijd  geboortedatum         leeftijd   date  Y  -date  Y   strtotime  geboortedatum        if  date  m   lt date  m   strtotime  geboortedatum             leeftijd    leeftijd-1      elseif  date  m    date  m   strtotime  geboortedatum           if  date  d   lt date  d   strtotime  geboortedatum                leeftijd    leeftijd-1      return  leeftijd

User · Answer

I use the following method to calculate age    oDateNow   new DateTime     oDateBirth   new DateTime  sDateBirth       New interval  oDateIntervall    oDateNow- gt diff  oDateBirth       Output echo  oDateIntervall- gt y

User · Answer

I find this works and is simple    Subtract from 1970 because strtotime calculates time from 1970-01-01  http   php net manual en function strtotime php   function getAge  date        return intval date  Y   time   - strtotime  date    - 1970      Results   Current Time  2015-10-22 10 04 23  getAge  2005-10-22        gt  10 getAge  1997-10-22 10 06 52      one 1s before    gt  17 getAge  1997-10-22 10 06 50      one 1s after   gt  18 getAge  1985-02-04        gt  30 getAge  1920-02-29        gt  95

User · Answer

This works fine        lt  php     date in mm dd yyyy format  or it can be in other formats as well    birthDate    12 17 1983       explode the date to get month  day and year    birthDate   explode       birthDate       get age from date or birthdate    age    date  md   date  U   mktime 0  0  0   birthDate 0    birthDate 1    birthDate 2      gt  date  md           date  Y   -  birthDate 2   - 1         date  Y   -  birthDate 2       echo  Age is      age    gt

User · Answer

This function works fine  It s a slight imporvement of the code of Parkyprg  function age  birthday    list  day  month  year    explode      birthday     year diff    date  Y   -  year    month diff   date  m   -  month    day diff     date  d   -  day   if   day diff  lt  0  amp  amp   month diff  0   year diff--    if   day diff  lt  0  amp  amp   month diff  lt  0   year diff--    return  year diff

User · Answer

How about launching this query and having MySQL calculating it for you   SELECT  username  date of birth   PERIOD DIFF  DATE FORMAT CURDATE      Y m     DATE FORMAT date of birth    Y m      DIV 12 AS years   PERIOD DIFF  DATE FORMAT CURDATE      Y m     DATE FORMAT date of birth    Y m      MOD 12 AS months FROM users   Result   r2d2  1986-12-23 00 00 00  27   6    The user has 27 years and 6 months  it counts an entire month

User · Answer

Write a PHP script to calculate the current age of a person   Sample date of birth   11 4 1987  Sample Solution   PHP Code    lt  php  bday   new DateTime  11 4 1987       Your date of birth  today   new Datetime date  m d y      diff    today- gt diff  bday   printf   Your age    d years   d month   d days    diff- gt y   diff- gt m   diff- gt d   printf   n      gt    Sample Output   Your age   30 years  3 month  0 days

User · Answer

birthday timestamp   strtotime  1988-12-10          Calculates age correctly    Just need birthday in timestamp  age   date  md    birthday timestamp   gt  date  md     date  Y   - date  Y    birthday timestamp  - 1   date  Y   - date  Y    birthday timestamp

User · Answer

function dob   birthday       list  day  month  year    explode      birthday        year diff    date  Y   -  year       month diff   date  m   -  month       day diff     date  d   -  day      if   day diff  lt  0     month diff  lt  0         year diff--      return  year diff

User · Answer

Age Calculator  function getAge  dob  condate         birthdate   new DateTime date  Y-m-d    strtotime implode  -   array reverse explode       dob             today  new DateTime date  Y-m-d    strtotime implode  -   array reverse explode       condate                        age    birthdate- gt diff  today - gt y       return  age      dob  06 06 1996     date of Birth  condate  07 02 16     Certain fix Date of Age  echo getAge  dob  condate

User · Answer

this is my function to calculating DOB with the specific return of age by year  month  and day   function ageDOB  y 2014  m 12  d 31       y   year   m   month   d   day    date default timezone set  Asia Jakarta       can change with others time zone      ageY   date  Y  -intval  y    ageM   date  n  -intval  m    ageD   date  j  -intval  d    if   ageD  lt  0        ageD    ageD    date  t         ageM--        if   ageM  lt  0        ageM  12       ageY--        if   ageY  lt  0    ageD    ageM    ageY   -1    return array   y   gt  ageY   m   gt  ageM   d   gt  ageD        this how to use it    age   ageDOB 1984 5 8      with my local time is 2014-07-01    echo sprintf  age    d years  d months  d days   age  y    age  m    age  d        output -  age   29 year 1 month 24 day

User · Answer

Try any of these using DateTime object   hours in day     24   minutes in hour  60   seconds in mins  60    birth date       new DateTime  1988-07-31T00 00 00     current date     new DateTime      diff              birth date- gt diff  current date    echo  years        diff- gt y     years      diff- gt m     months      diff- gt d     day s    echo   lt br  gt    echo  months        diff- gt y   12     diff- gt m     months      diff- gt d     day s    echo   lt br  gt    echo  weeks       floor  diff- gt days 7      weeks      diff- gt d 7     day s    echo   lt br  gt    echo  days         diff- gt days     days   echo   lt br  gt    echo  hours        diff- gt h     diff- gt days    hours in day      hours   echo   lt br  gt    echo  mins         diff- gt h     diff- gt days    hours in day    minutes in hour      minutest   echo   lt br  gt    echo  seconds      diff- gt h     diff- gt days    hours in day    minutes in hour    seconds in mins      seconds   echo   lt br  gt      Reference http   www calculator net age-calculator html

User · Answer

tz    new DateTimeZone  Europe Brussels     age   DateTime  createFromFormat  d m Y    12 02 1973    tz       - gt diff new DateTime  now    tz        - gt y    As of PHP 5 3 0 you can use the handy DateTime  createFromFormat to ensure that your date does not get mistaken for m d Y format and the DateInterval class  via DateTime  diff  to get the number of years between now and the target date

User · Answer

The following works great for me and seems to be a lot simpler than the examples that have already been given    dob date    01    dob month    01    dob year    1970    year   gmdate  Y     month   gmdate  m     day   gmdate  d     age    year- dob year      age calculates the user s age determined by only the year if  month  lt   dob month       this checks if the current month is before the user s month of birth    age    age-1    else if  month     dob month  amp  amp   day  gt    dob date       this checks if the current month is the same as the user s month of birth and then checks if it is the user s birthday or if it is after it    age    age    else if  month     dob month  amp  amp   day  lt   dob date      this checks if the current month is the user s month of birth and checks if it before the user s birthday    age    age-1    else      age    age      I ve tested and actively use this code  it might seem a little cumbersome but it is very simple to use and edit and is quite accurate

User · Answer

Figured I d throw this on here since this seems to be most popular form of this question   I ran a 100 year comparison on 3 of the most popular types of age funcs i could find for PHP and posted my results  as well as the functions  to my blog   As you can see there  all 3 funcs preform well with just a slight difference on the 2nd function   My suggestion based on my results is to use the 3rd function unless you want to do something specific on a person s birthday  in which case the 1st function provides a simple way to do exactly that       Found small issue with test  and another issue with 2nd method  Update coming to blog soon  For now  I d take note  2nd method is still most popular one I find online  and yet still the one I m finding the most inaccuracies with    My suggestions after my 100 year review   If you want something more elongated so that you can include occasions like birthdays and such   function getAge  date       Y-m-d format      now   explode  -   date  Y-m-d          dob   explode  -    date        dif    now 0  -  dob 0       if   dob 1   gt   now 1        birthday month has not hit this year          dif -  1            elseif   dob 1      now 1        birthday month is this month  check day         if   dob 2   gt   now 2                  dif -  1                    elseif   dob 2      now 2        Happy Birthday               dif    dif   Happy Birthday                          return  dif     getAge  1980-02-29      But if you just simply want to know the age and nothing more  then   function getAge  date       Y-m-d format     return intval substr date  Ymd   - date  Ymd   strtotime  date    0  -4       getAge  1980-02-29      See BLOG    A key note about the strtotime method   Note   Dates in the m d y or d-m-y formats are disambiguated by looking at the  separator between the various components  if the separator is a slash       then the American m d y is assumed  whereas if the separator is a dash  -   or a dot      then the European d-m-y format is assumed  If  however  the  year is given in a two digit format and the separator is a dash  -  the date  string is parsed as y-m-d   To avoid potential ambiguity  it s best to use ISO 8601  YYYY-MM-DD  dates or  DateTime  createFromFormat   when possible

User · Answer

I use Date Time for this   age   date diff date create  bdate   date create  now   - gt y

[php] PHP calculate age

Examples related to php