PHP Regex to check date is in YYYY-MM-DD format

Question

I m trying to check that dates entered by end users are in the YYYY-MM-DD  Regex has never been my strong point  I keep getting a false return value for the preg match   I have setup   So I m assuming I have made a mess of the regex  detailed below    date  2012-09-12    if  preg match    0-9  4 - 0-1  0-9 - 0-3  0-9     date                 return true       else          return false          Any thoughts

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It s probably better to use another mechanism for this   The modern solution  with DateTime    dt   DateTime  createFromFormat  Y-m-d    date   return  dt     false  amp  amp   array sum  dt  getLastErrors       This validates the input too   dt     false ensures that the date can be parsed with the specified format and the array sum trick is a terse way of ensuring that PHP did not do  month shifting   e g  consider that January 32 is February 1   See DateTime  getLastErrors   for more information   Old-school solution with explode and checkdate   list  y   m   d    array pad explode  -    date  3   3  0   return ctype digit   y m d    amp  amp  checkdate  m   d   y     This validates that the input is a valid date as well  You can do that with a regex of course  but it s going to be more fuss -- and February 29 cannot be validated with a regex at all   The drawback of this approach is that you have to be very careful to reject all possible  bad  inputs while not emitting a notice under any circumstances  Here s how    explode is limited to return 3 tokens  so that if the input is  1-2-3-4    d will become  3-4   ctype digit is used to make sure that the input does not contain any non-numeric characters  apart from the dashes  array pad is used  with a default value that will cause checkdate to fail  to make sure that enough elements are returned so that if the input is  1-2  list   will not emit a notice

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I was searching  how to validate date  and found this solution  Its old but i ll share below method that can be use to validate date in php   checkdate  01    31    2019

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Function to validate generic date format   function validateDate  date   format    Y-m-d        d   DateTime  createFromFormat  format   date     return  d  amp  amp   d- gt format  format      date      Example of execution   var dump validateDate  2021-02-28        true var dump validateDate  2021-02-29        false

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Check and validate YYYY-MM-DD date in one line statement  function isValidDate  date        return preg match      d 4  -  d 1 2  -  d 1 2        date   m            checkdate intval  m 2    intval  m 3    intval  m 1              false      The output will be   var dump isValidDate  2018-01-01        bool true  var dump isValidDate  2018-1-1          bool true  var dump isValidDate  2018-02-28        bool true  var dump isValidDate  2018-02-30        bool false    Day and month without leading zero are allowed  If you don t want to allow this  the regexp should be        d 4  -  d 2  -  d 2

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From Laravel 5 7 and date format i e   12 31 2019  function checkDateFormat string  date   bool       return preg match     0 1-9  1 0-2     0 1-9   1-2  0-9  3 0-1     0-9  4       date

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If you use Symfony 4 1 2 try this  1      validDate   explode  -   request- gt get  date             if  checkdate filter var  validDate 1  FILTER SANITIZE NUMBER INT  filter var  validDate 0  FILTER SANITIZE NUMBER INT  filter var  validDate 2  FILTER SANITIZE NUMBER INT                  date   date create filter var  request- gt get  date   FILTER SANITIZE SPECIAL CHARS             else              return  this- gt redirectToRoute  YOUR ROUTE

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You can make it this way   if  preg match    d 4  - d 2 - d 2      date         echo  true     else       echo  false       but you d better use this one    date   DateTime  createFromFormat  Y-m-d    date   if   date        echo  date - gt  format  Y-m-d        in this case you ll get an object which is muck easier to use than just strings

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This method can be useful to validate date in PHP  Current method is for mm dd yyyy format  You have to update parameter sequence in checkdate as per your format and delimiter in explode        function isValidDate  dt                 dtArr   explode       dt           if   empty  dtArr 0    amp  amp   empty  dtArr 1    amp  amp   empty  dtArr 2                  return checkdate  int   dtArr 0    int   dtArr 1    int   dtArr 2              else               return false

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yyyy-mm-dd          19  2-9  d  d 2   - 0 13578  1 02   - 0 1-9   12  d 3 01       19  2-9  d  d 2   - 0 13456789  1 012   - 0 1-9   12  d 30      19  2-9  d  d 2   -02 - 0 1-9  1 d 2 0-8       1 6-9   2-9  d  0 48   2468  048   13579  26     16  2468  048   3579  26  00   -02 -29    g  yyyy mm dd          19  2-9  d  d 2     0 13578  1 02     0 1-9   12  d 3 01       19  2-9  d  d 2     0 13456789  1 012     0 1-9   12  d 30      19  2-9  d  d 2    02   0 1-9  1 d 2 0-8       1 6-9   2-9  d  0 48   2468  048   13579  26     16  2468  048   3579  26  00    02  29    g  mm-dd-yyyy        0 13578  1 02   - 0 1-9   12  d 3 01   -  19  2-9  d  d 2      0 13456789  1 012   - 0 1-9   12  d 30  -  19  2-9  d  d 2     02 - 0 1-9  1 d 2 0-8   -  19  2-9  d  d 2     02 -29 -  1 6-9   2-9  d  0 48   2468  048   13579  26     16  2468  048   3579  26  00      g  mm dd yyyy         0 13578  1 02     0 1-9   12  d 3 01      19  2-9  d  d 2      0 13456789  1 012     0 1-9   12  d 30     19  2-9  d  d 2     02   0 1-9  1 d 2 0-8      19  2-9  d  d 2     02  29    1 6-9   2-9  d  0 48   2468  048   13579  26     16  2468  048   3579  26  00      g  dd mm yyyy         0 1-9   12  d 3 01     0 13578  1 02      19  2-9  d  d 2      0 1-9   12  d 30    0 13456789  1 012      19  2-9  d  d 2      0 1-9  1 d 2 0-8    02    19  2-9  d  d 2     29  02    1 6-9   2-9  d  0 48   2468  048   13579  26     16  2468  048   3579  26  00      g  dd-mm-yyyy        0 1-9   12  d 3 01   - 0 13578  1 02   -  19  2-9  d  d 2      0 1-9   12  d 30  - 0 13456789  1 012   -  19  2-9  d  d 2      0 1-9  1 d 2 0-8   -02 -  19  2-9  d  d 2     29 -02 -  1 6-9   2-9  d  0 48   2468  048   13579  26     16  2468  048   3579  26  00      g

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To work with dates in php you should follow the php standard so the given regex will assure that you have valid date that can operate with PHP       preg match      0-9  4  - 0 1-9  1 0-2  - 0 1-9   1-2  0-9  3 0-1       date

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It all depends on how strict you want this function to be  For instance  if you don t want to allow months above 12 and days above 31  not depending on the month  that would require writing date-logic   it could become pretty complicated   function checkDate  date       regex                             Allows years 0000-9999          0-9  4            -            Allows 01-12                     01     02     03     04     05     06     07     08     09     10              11     12                     -            Allows 01-31                     01     02     03     04     05     06     07     08     09     10              11     12     13     14     15     16     17     18     19     20              21     22     23     24     25     26     27     28     29     30              31                             if   preg match  regex   date          return true         return false      result   checkDate  2012-09-12      Personally I d just go for      0-9  4  -  0-9  2  - 0-9  2

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Try this    date  2012-09-12    if  preg match     0-9  4 - 0 1-9  1 0-2  - 0 1-9   1-2  0-9  3 0-1       date         return true    else       return false

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If you want to match that type of date  use   preg match     d 4 - d 2 - d 2       date

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If it is of any help  here is a regex for j-n-Y format  year has to be greater than 2018    if  preg match      1-9   1-2  0-9   3  0-1   -  1-9   1  0-2   -   20   1  8-9   2-9  0-9        date           Do stuff

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preg match needs a   or another char as delimiter   preg match     0-9  4 - 0-1  0-9 - 0-3  0-9      date    you also should check for validity of that date so you wouldn t end up with something like 9999-19-38  bool checkdate   int  month   int  day   int  year

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This should tell you if the format is valid and if the input date is valid        datein    2012-11-0        if preg match     0-9  4 - 0 1-9  1 0-2  - 0 1-9   1-2  0-9  3 0-1        datein            echo  good        else          echo  no good

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Criteria   Every year divisible by 4 is a leap year  except when it is divisible by 100 unless it is divisible by 400   So   2004 - leap year - divisible by 4 1900 - not a leap year - divisible by 4  but also divisible by 100 2000 - leap year - divisible by 4  also divisible by 100  but divisible by 400   February has 29 days in a leap year and 28 when not a leap year  30 days in April  June  September and November  31 days in January  March  May  July  August  October and December  Test   The following dates should all pass validation   1976-02-29 2000-02-29 2004-02-29 1999-01-31   The following dates should all fail validation   2015-02-29 2015-04-31 1900-02-29 1999-01-32 2015-02-00   Range   We ll test for dates from 1st Jan 1000 to 31st Dec 2999   Technically the currently used Gregorian calendar only came into use in 1753 for the British Empire and at various years in the 1600s for countries in Europe  but I m not going to worry about that   Regex to test for a leap year   The years divisible by 400   1200 1600 2000 2400 2800 can be shortened to   1 26  2 048  00  if you wanted all years from 1AD to 9999 then this would do it   0 48   13579  26   2468  048  00 if you re happy with accepting 0000 as a valid year then it can be shortened    13579  26   02468  048  00   The years divisible by 4    12  d  02468  048   13579  26     The years divisible by 100    12  d00   Not divisible by 100    12  d  1-9  d  d 1-9     The years divisible by 100 but not by 400     1 1345789    2 1235679   00   Divisible by 4 but not by 100    12  d  2468  048   13579  26  0 48     The leap years   divisible by 400 or  divisible by 4 and not divisible by 100    1 26  2 048  00   12  d  2468  048   13579  26  0 48     Not divisible by 4    12  d  02468  1235679   13579  01345789     Not a leap year   Not divisible by 4 OR is divisible by 100 but not by 400   12  d  02468  1235679   13579  01345789       1 1345789    2 1235679   00    Valid Month and day excluding February MM-DD      01 03 05 07 08 10 12 - 0 1-9   12  d 3 01      04 06 09 11 - 0 1-9   12  d 30   shortened to    0 13578  1 02  - 0 1-9   12  d 3 01      0 469  11 - 0 1-9   12  d 30     February with 28 days   02- 0 1-9  1 d 2 0-8     February with 29 days   02- 0 1-9   12  d    Valid date    leap year followed by  valid month-day-excluding-february OR 29-day-february    OR  non leap year followed by  valid month-day-excluding-february OR 28-day-february        1 26  2 048  00   12  d  2468  048   13579  26  0 48   -    0 13578  1 02  - 0 1-9   12  d 3 01      0 469  11 - 0 1-9   12  d 30     02- 0 1-9   12  d         12  d  02468  1235679   13579  01345789      1 1345789  2 1235679  00  -    0 13578  1 02  - 0 1-9   12  d 3 01      0 469  11 - 0 1-9   12  d 30     02- 0 1-9  1 d 2 0-8        So there you have it a regex for dates between 1st Jan 1000 and 31st Dec 2999 in YYYY-MM-DD format   I suspect it can be shortened quite a bit  but I ll leave that up to somebody else   That will match all valid dates   If you want it to only be valid when it contains just one date and nothing else  then wrap it in          like so         1 26  2 048  00   12  d  2468  048   13579  26  0 48   -    0 13578  1 02  - 0 1-9   12  d 3 01      0 469  11 - 0 1-9   12  d 30     02- 0 1-9   12  d         12  d  02468  1235679   13579  01345789      1 1345789  2 1235679  00  -    0 13578  1 02  - 0 1-9   12  d 3 01      0 469  11 - 0 1-9   12  d 30     02- 0 1-9  1 d 2 0-8          If you want it for an optional date entry  ie  it can be blank or a valid date  then add     at the beginning  like so            1 26  2 048  00   12  d  2468  048   13579  26  0 48   -    0 13578  1 02  - 0 1-9   12  d 3 01      0 469  11 - 0 1-9   12  d 30     02- 0 1-9   12  d         12  d  02468  1235679   13579  01345789      1 1345789  2 1235679  00  -    0 13578  1 02  - 0 1-9   12  d 3 01      0 469  11 - 0 1-9   12  d 30     02- 0 1-9  1 d 2 0-8

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you can use   function validateDate  date   format    Y-m-d H i s          d   DateTime  createFromFormat  format   date       return  d  amp  amp   d- gt format  format      date      date  2012-09-12       echo validateDate  date   Y-m-d       true or false

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Probably useful to someone    patterns   array               Y              gt     0-9  4                   Y-m            gt     0-9  4  -      1-9  0 1-9  1 0-2                    Y-m-d          gt     0-9  4  -      1-9  0 1-9  1 0-2   -      1-9  0 1-9   1-2  0-9  3 0-1                    Y-m-d H        gt     0-9  4  -      1-9  0 1-9  1 0-2   -      1-9  0 1-9   1-2  0-9  3 0-1   s 0  0-1  0-9  2 0-4                    Y-m-d H i      gt     0-9  4  -      1-9  0 1-9  1 0-2   -      1-9  0 1-9   1-2  0-9  3 0-1   s 0  0-1  0-9  2 0-4     0  0-5  0-9  60                   Y-m-d H i s    gt     0-9  4  -      1-9  0 1-9  1 0-2   -      1-9  0 1-9   1-2  0-9  3 0-1   s 0  0-1  0-9  2 0-4      0  0-5  0-9     0  0-5  0-9   6000 60 00                 echo preg match  patterns  Y     1996       true echo preg match  patterns  Y     19966       false echo preg match  patterns  Y     199z       false echo preg match  patterns  Y-m     1996-0       false echo preg match  patterns  Y-m     1996-09       true echo preg match  patterns  Y-m     1996-1       true echo preg match  patterns  Y-m     1996 1       true echo preg match  patterns  Y-m     1996 12       true echo preg match  patterns  Y-m     1996 13       false echo preg match  patterns  Y-m-d     1996-11-1       true echo preg match  patterns  Y-m-d     1996-11-0       false echo preg match  patterns  Y-m-d     1996-11-32       false echo preg match  patterns  Y-m-d H     1996-11-31 0       true echo preg match  patterns  Y-m-d H     1996-11-31 00       true echo preg match  patterns  Y-m-d H     1996-11-31 24       true echo preg match  patterns  Y-m-d H     1996-11-31 25       false echo preg match  patterns  Y-m-d H i     1996-11-31 2400       true echo preg match  patterns  Y-m-d H i     1996-11-31 24 00       true echo preg match  patterns  Y-m-d H i     1996-11-31 24 59       true echo preg match  patterns  Y-m-d H i     1996-11-31 24 60       true echo preg match  patterns  Y-m-d H i     1996-11-31 24 61       false echo preg match  patterns  Y-m-d H i     1996-11-31 24 61       false echo preg match  patterns  Y-m-d H i s     1996-11-31 24 6000       true echo preg match  patterns  Y-m-d H i s     1996-11-31 24 60 00       true echo preg match  patterns  Y-m-d H i s     1996-11-31 24 59 59       true echo preg match  patterns  Y-m-d H i s     1996-11-31 24 59 60       false echo preg match  patterns  Y-m-d H i s     1996-11-31 24 60 01       false

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I know that this is a old question  But I think I have a good solution    date    2016-02-21    format    Y-m-d    if date  format  strtotime  date      date  date         echo  true     else       echo  false       You can try it  If you change the date to 21 02 2016 the echo is false  And if you change the format after that to d m Y the echo is true   With this easy code you should be able to check which date-format is used without checking it by the regex   Maybe there is a person who will test it on every case  But I think my idea is generally valid  For me it seems logical

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You can use a preg match with a checkdate php function   date     2012-10-05    split   array    if  preg match       0-9  4  -  0-9  2  -  0-9  2        date   split         return checkdate  split 2    split 3    split 1       return false

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You could also do it like this   if  DateTime  createFromFormat  Y-m-d    date - gt format  Y-m-d        date            date is correctly formatted and valid  execute some code      This will not only check the format  but also the validity of the date self  since DateTime will create only valid dates and this needs to match the input

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Format 1    format1    2012-12-31        Format 2    format2    31-12-2012     if  preg match     0-9  4 - 0 1-9  1 0-2  - 0 1-9   1-2  0-9  3 0-1       format1         return true    else       return false     if  preg match     0 1-9   1-2  0-9  3 0-1  - 0 1-9  1 0-2  - 0-9  4      format2         return true    else       return false

[php] PHP Regex to check date is in YYYY-MM-DD format

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