I want to detect if a string is a time (00:18:31). I know about strtotime() but it also detects "now" as OK, and so on. I need a real solution.
Try this:-
if (DateTime::createFromFormat('H:i:s', $yourtimeString) !== FALSE) {
echo "it's a date";
}else{
echo "it's not a date";
}
Input:- 00:18:31 Output:- it's a date
Input:- now,NOW,now(),NOW() Output:- it's not a date
The validateTime() function checks whether the given string is a valid time. using DateTime class and createFromFormat() static method.
function validateTime($time, $format = 'H:i:s'){
$t = DateTime::createFromFormat($format, $time);
return $t && $t->format($format) === $time;
}
// Returns true
echo var_dump(validateTime("00:18:31"));
echo var_dump(validateTime("23:59:59"));
echo var_dump(validateTime("00:02:30"));
// Returns false
echo var_dump(validateTime("31:18:31"));
echo var_dump(validateTime("24:00:00"));
echo var_dump(validateTime("23:60:60"));
Explanation of $t->format($format) === $time
is a test to check if the time is indeed a real time or not. for instance 23:59:59 is valid time but 24:00:00 is not.
We all know that 23:59:59 is the max acceptable Human time. and 24:00:00 is not. However, We can pretend it means the next day at 00:00:00. that is what DateTime::createFromFormat do! when we give it a time exceed the maximum. It accept it by adding the remaining time to the next day.
For example
today is 2021-05-14 23:59:59
and time to check if we give it to createFromFormat is 24:02:30 the date becomes next day 2021-05-15 00:02:30
We notice that 24:02:30 != 00:02:30. So from that we can summarize that is not valid time. To be valid it must be the same!
Related
I am having a bit of trouble working out how to validate whether a timezone has passed a certain time (local to the time zone).
So for instance, if the time in London has passed 18:00:00
$tz = new DateTimeZone('Europe/London');
$datetime1->setTimezone($tz); // calculates with new TZ now
if ($datetime1->format('H:i:s') >= strtotime('18:00:00')) {
echo "time has passed";
} else {
echo "time has NOT passed";
}
The problem with this is that strtotime('18:00:00') seems to be using the server time.
If I echo strtotime('18:00:00'); will return 1470247200 which is the amount of seconds since 1970 but this will not be the 6pm time for another timezone for instance America/New_York which at the time of writing this has not passed.
Any idea how this can be done?
Thanks,
Use DateTime's own comparison feature since it includes time zone support:
$tz = new DateTimeZone('Europe/London');
$datetime1->setTimezone($tz); // calculates with new TZ now
$datetime2 = new \DateTime('18:00:00', $tz);
if ($datetime1 >= sdatetime2) {
echo "time has passed";
} else {
echo "time has NOT passed";
}
I think this should work:
if ($datetime1->format('H:i:s') >= '18:00:00') {
The left side is a string, and every component contains leading zeros, so you can just do a string comparison with the right side.
(This assumes that you consider midnight of the next day to not have "passed" 18:00:00.)
Is there a way to convert an input time string (ex: 01:13) to a Zend date object, so that I store it later in a timestamp column in a Mysql database.
Examples:
If the current datetime is 2013-07-15 17:33:07 and the user inputs 18:05 the output should be 2013-07-15 18:05:00.
If the current datetime is 2013-07-15 17:33:07 and the user inputs 02:09 the output should be 2013-07-16 02:09:00. Notice that since the time entered was lower than the current time, so it was treated as tomorrows time.
I simply want to get the next point in time that satisfies the entered time. I'm open for solution using plain PHP or Zend_Date.
I think you should compare the current time with the time entered by the user and create a DateTime object of either "today" or "tomorrow". DateTime accepts strtotime() relative time parameters.
Quick hack. Works as of today, 15.07.2013 23:58 local time:
$nextTime = new DateTime('today 18:10');
if ($nextTime < new DateTime('now')) { // DateTime comparison works since 5.2.2
$nextTime = new DateTime('tomorrow 18:10');
}
echo $nextTime->format('d.m.Y H:i:s');
here is working example for you just add your dynamic variable to check date with user inputs
You can use mktime function to manage your date.
$input_date = date("Y-m-d H:i:s",mktime(18,05,0,date("m"),date("d"),date("Y")));
echo "current time".$current_time = date('Y-m-d H:m:s');
echo "<br>User input is ".$input_date;
if(strtotime($current_time) > strtotime($input_date)){
$input_date = date("Y-m-d H:i:s",mktime(18,05,0,date("m"),date("d")+1,date("Y")));
echo "in";
}else{
// nothing to do
}
echo "<br> result->".$input_date;
i hope it will sure solve your issue
I need a method that gets two strings that represents a DateTime (in the MySql syntax) and returns the time difference between them.
Then I need to compare that time to 3 seconds so I could block a Brute Force attack on my server.
I've messed a lot with Google and I managed to get the string representation of the DateTime object, but I can't manage to convert and compare them.
$time_str1 = '2011-09-10 19:59:23'; // first string datetime from DB
$time_str2 = '2011-09-10 19:59:24'; // second string datetime from DB
// first DateTime object created based on the MySQL datetime format
$dt1 = DateTime::createFromFormat('Y-m-d H:i:s', $time_str1);
// second DateTime object created based on the MySQL datetime format
$dt2 = DateTime::createFromFormat('Y-m-d H:i:s', $time_str2);
// difference comparison to check if at least 3 seconds have passed
if ( ($dt2->format('U') - $dt1->format('U')) > 3) {
echo 'Ok, no brute force'; // yes, three seconds have passed
} else{
echo 'We got you newbie'; // nope, three second haven't passed
}
$diffInSeconds = $dateTimeLater->format('U') - $dateTimeFirst->format('U');
strtotime( $timeStr ) which will convert to the amount of seconds since epoch http://en.wikipedia.org/wiki/Unix_epoch . Then you can just use standard mathematical operators. Be warned, strtotime can be inaccurate sometimes. To convert back, date("m-d-Y H:i:s", $time)
Heres an alternative method using a session, no need to query a db for a timestamp:
<?php
session_start();
function post_check($limit){
//Check for first time
if(isset($_SESSION['post_check'])){
//Check for count on failed
if(isset($_SESSION['post_check_count'])){
//If fail count is more then 3 block till user closes down browser
if($_SESSION['post_check_count']>$limit){
die('Too many requsets to the server, please close down your browesr and try again.');
}
}else{
//Set for count on failed
$_SESSION['post_check_count']=0;
}
//Check (time-limit) against timestamp held in session
if(($_SESSION['post_check']+$limit)<=time()){
//Update timestamp
$_SESSION['post_check']=time();
//Ok
return true;
}else{
//Update Fail count
$_SESSION['post_check_count']++;
//Fail
return false;
}
}else{
//Set for first time
$_SESSION['post_check']=time();
return true;
}
}
//Pretty self explanitry here
if(post_check('3')===true){
echo 'Allowed: handle post stuff here';
}else{
echo'Too many requests within given time limit do nothing';
}
?>
On the MySQL side:
SELECT UNIX_TIMESTAMP(my_time) FROM my_table
On the PHP side, you then have UNIX timestamps in seconds, which you can compare.
In my PHP application I'm trying to compare date time values like the following:
if($datetime_from_db < date('Y-m-d H:i:s'))
{
// then do something
}
Both values are in the same format. What I can't figure out is why it only compares the date and ignores the time. Both the date and the time values are important for me but I don't know how to make it work.
Comparing a string like "2011-02-14 15:46:00" to another string doesn't actually compare dates, it compares two strings according string parsing numeric rules. You will need to compare actual numeric timestamps:
strtotime($datetime_from_db) < time()
If you want this to work with dates past 2038, you can't use strtotime() or time().
See this question for the explanation.
A better approach:
new DateTime($datetime_from_db) < new DateTime();
This may help you.
$today = date("m-d-Y H:i:s");
$thisMonth =date("m");
$thisYear = date("y");
$expectedDate = $thisMonth."-08-$thisYear 23:58:00";
//pr($today);
//pr($expectedDate);
if (strtotime($expectedDate) > strtotime($today)) {
echo "Expected date is greater then current date";
return ;
} else
{
echo "Expected date is lesser then current date";
}
Here is a solution where we use strtotime. I give two examples.
First one comparing the whole timestamp. Second one is just compare the date.
<?php
$date = "2022-10-06 17:49:10"; // string. can set any current timestamp
#example 1 - compare the date and time Y-m-d H:i:s
if(date("Y-m-d H:i:s" , strtotime($date)) >= date("Y-m-d H:i:s")){
echo "the date checked is bigger than today";
}else{
echo "the date checked is smaller than today";
}
#example 2 - compare the date only Y-m-d
if(date("Y-m-d" , strtotime($date)) == date("Y-m-d")){
echo "same day is true";
}else{
echo "same day is false";
}
function convertDT($TS) {
$TS = strtotime($TS);
$TS -= date("Z");
$newTS = date("Y-m-d\TH:i:s\Z", $TS);
return $newTS;
}
echo "Good: ".convertDT('2010-04-20 01:23:45')."\n";
echo "Bad: ".convertDT('2010-31-20 01:23:45')."\n";
The second date returns: 1969-12-31T23:00:00Z
Why? Should this error?
strtotime() returns false when you give it an invalid timestamp. false is equivalent to 0 if you use it in an integer context, so when you pass it to this line:
$newTS = date("Y-m-d\TH:i:s\Z", $TS);
You are effectively creating a date from a timestamp of 0. In terms of the UNIX epoch, 0 is January 1st, 1970, which is where you're getting your end result from.
Your best bet would be soemthing like this:
$TS = strtotime($TS);
if($TS === false) {
throw new Exception("Invalid timestamp.");
}
//etc.
On your second date, you are trying to create a date of month 31 and of day 20. Even if you reversed these, it wouldn't make sense. Probably a typo.
read this http://php.net/manual/en/function.strtotime.php
Errors/Exceptions
Every call to a date/time function
will generate a E_NOTICE if the time
zone is not valid, and/or a E_STRICT
or E_WARNING message if using the
system settings or the TZ environment
variable. See also
date_default_timezone_set()
This function will not generate any error even if input string is not valid.