Validate that input is in this time format - “HH:MM” [closed]

Answer 1

If you're looking for seconds (24hour). This worked like a charm for me.

$time = "23:59:60";    
preg_match("/^([0-1][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])$/", $time)

Answer 2

Corrected answer for @Toskan if you only want to validate HH:MM string

     protected function isValidTime($timeStr){

    $dateObj = DateTime::createFromFormat('d.m.Y H:i', "10.10.2010 " . $timeStr);
    $dateObjOffset = DateTime::createFromFormat('d.m.Y H:i', "10.10.2010 " . '24:00');

    if($dateObjOffset <= $dateObj){
        return false;
    }
    if ($dateObj !== false) {
       return true;
    }
    else{
       return false;
    }
}

Answer 3

Another approch without using regex.

if(is_string($foo)  && (strlen($foo) == 4 || strlen($foo) == 5) && intval(str_replace(':','',$foo)) > -1 && intval(str_replace(':','',$foo)) < 2360){
    stuff to do if valid time
}
else{
    stuff to do if invalid time
}

First of all I check if the datatype is string. If not it obvious that it is not a valid time. Then I check if the string has the right lenght of 4 / 5 letters. With str_replace I remove the ':' and then cast the result to an integer which I could easily compare to the desired time range (in my example 00:00 - 23:59).

Answer 4

You can use regular expressions to check that.

for 12-hour:

preg_match("/^(?:1[012]|0[0-9]):[0-5][0-9]$/", $foo)

for 24-hour:

preg_match("/^(?:2[0-3]|[01][0-9]):[0-5][0-9]$/", $foo)

If you use a 24-hour clock going from 01:00 to 24:59, use

preg_match("/^(?:2[0-4]|[01][1-9]|10):([0-5][0-9])$/", $foo)

Answer 5

Simple function that validates a date (and/or time) without throwing exceptions. It takes the expected date format as a parameter:

function isValidDate(string $date, string $format = 'Y-m-d'): bool
{
    $dateObj = DateTime::createFromFormat($format, $date);
    return $dateObj && $dateObj->format($format) == $date;
}

How it works: it converts the input date into a PHP DateTime object according to the passed $format, then compares this object with the original input date. If they match, the date is valid and has the expected format.

Some usage examples:

/* Valid Examples: */
isValidDate("2017-05-31");
isValidDate("23:15:00", 'H:i:s');
isValidDate("2017-05-31 11:15:00", 'Y-m-d h:i:s');

/* Invalid: */
isValidDate("2012-00-21");
isValidDate("25:15:00", 'H:i:s');
isValidDate("Any string that's not a valid date/time");

Answer 6

You can do:

if(preg_match('/^(?:[01][0-9]|2[0-3]):[0-5][0-9]$/',$input)) {
        // $input is valid HH:MM format.
}