What's the simplest way to do this?
$known_time = '19:33:39' //GMT
I want to get the current GMT Time and calculate if it is past $known_time
I do not care about the dates, I simply want to know if the time of day right now in GMT is later than $known_time
My attempts so far were clumsy as I first checked the hour...than the minute. I'm sure there's a more elegant method. Thank you!
I don't know what elegant is for you but alternatively, you could just also DateTime objects:
$now = new DateTime('GMT');
$known_time = new DateTime('19:33:39', new DateTimeZone('GMT'));
if($now >= $known_time) {
echo 'now is greater';
} else {
echo 'now is less than the time you provided';
}
you can use PHP 5.2 or above and the following functions are available there:
$date_a = new DateTime('2010-10-20 08:10:00');
$date_b = new DateTime('2008-12-13 10:42:00');
$interval = date_diff($date_a,$date_b);
echo $interval->format('%h:%i:%s');
or
what you can do is use: strtotime($yourtime)-strtotime(othertime), this will give you the difference.and then use round() to basically round the numbers..
Related
I have these two functions:
function time_is_older_than($timestamp, $time_string)
{
if (strtotime($timestamp) < strtotime('-' . $time_string))
return true;
return false;
}
function time_is_younger_than($timestamp, $time_string)
{
if (strtotime($timestamp) > strtotime('-' . $time_string))
return true;
return false;
}
They enable me to do neat things like:
if (time_is_older_than($last_time_some_action_happened, '5 minutes'))
do_it_again();
They normally work, except for during one hour every six months, when my timezone switches over to "summer time" or "winter time". This means that the clocks are increased or put back one hour at midnight (according to this timezone).
The PHP manual states this for strtotime:
The Unix timestamp that this function returns does not contain information about time zones. In order to do calculations with date/time information, you should use the more capable DateTimeImmutable.
However, if I provide the exact same date/time string, with "+08:00" added in the end versus "+00:00", for example, I get different numbers of seconds returned. So strtotime() does understand timezones when it parses the provided time, even if the returned integer obviously doesn't contain this information. (Nor is it expected or required to by me.)
I've spent countless hours trying to debug this, testing countless things, and just sitting here thinking, but I can't figure out what exactly would make the code I have fail, specifically for one hour. And especially what about it I need to change. Setting the second parameter for strtotime() seems likely, but I just couldn't make it work correctly.
My hottest "lead" for quite some time was that the strtotime('-' . $time_string) part is ending up using a different timezone than the timestamp strings provided, but I do provide timezone data to it most of the time! An example of $last_time_some_action_happened might be something like 2020-10-28 02:22:41.123456+01.
I set the timezone with date_default_timezone_set().
I suspect that I only need to make some very minor change, but I've been experimenting so much and so long now, even taking rests in between, that my brain can no longer see this clearly. I bet the solution is something awfully simple.
Please don't tell me to use DateTimeImmutable. This would fundamentally change my entire structure and require me to do things very differently. Perhaps I should, and even will, at some point, but for now, I just wish to fix this rare but still very annoying bug in my existing code. (If it's possible at all, which I very much believe is the case.)
I'm able to reproduce the issue you are having:
date_default_timezone_set('Pacific/Auckland');
// Daylight saving time 2020 in New Zealand began at 2:00am on Sunday, 27 September
$current = strtotime('2020-09-27 02:04:00');
$d1 = strtotime('2020-09-27 02:05:00', $current);
$d2 = strtotime('-5 minutes', $current);
var_dump($d1 > $d2); // false
var_dump(date('Y-m-d H:i:s', $d1)); // 2020-09-27 03:05:00
var_dump(date('Y-m-d H:i:s', $d2)); // 2020-09-27 03:59:00
This person looks to be having the same issue as you and may appear to be a bug.
DateTime::modify and DST switch
The solution is to convert the dates to UTC then compare:
// Convert to UTC and compare
$d1 = new \DateTime('2020-09-27 02:05:00', new \DateTimeZone('Pacific/Auckland'));
$d2 = new \DateTime('2020-09-27 02:04:00', new \DateTimeZone('Pacific/Auckland'));
$d2->setTimezone(new \DateTimeZone('UTC'));
$d2->modify('-5 minutes');
$d2->setTimezone(new \DateTimeZone('Pacific/Auckland'));
var_dump($d1 > $d2); // true
var_dump($d1->format(\DateTimeInterface::RFC3339_EXTENDED)); // 2020-09-27T03:05:00.000+13:00
var_dump($d2->format(\DateTimeInterface::RFC3339_EXTENDED)); // 2020-09-27T01:59:00.000+12:00
I've updated your functions:
function time_is_older_than($datetime, $time_string)
{
$d1 = new \DateTime($datetime);
$d1->setTimezone(new \DateTimeZone('UTC'));
$d2 = new \DateTime();
$d2->setTimezone(new \DateTimeZone('UTC'));
$d2->modify('-' . $time_string);
return $d1 < $d2;
}
function time_is_younger_than($datetime, $time_string)
{
$d1 = new \DateTime($datetime);
$d1->setTimezone(new \DateTimeZone('UTC'));
$d2 = new \DateTime();
$d2->setTimezone(new \DateTimeZone('UTC'));
$d2->modify('-' . $time_string);
return $d1 > $d2;
}
Could you consider a solution:
In the timestamp string（like Thu, 21 Dec 2000 16:01:07 +0200）, add a timezone tag which specify timezone without difference of daylight saving time.
In the application that I'm working on, the user must choose a date/time which is at least 5 minutes into the future. For this, I'm trying to implement a check. Below is the code which checks the time difference between the current time and chosen time.
$cur_date = new DateTime();
$cur_date = $cur_date->modify("+1 hours"); //fix the time since its an hour behind
$cur_date = $cur_date->format('m/d/Y g:i A');
$to_time = strtotime($chosen_date);
$from_time = strtotime($cur_date);
echo round(abs($from_time - $to_time) / 60,2). " minute"; //check the time difference
This tells me the time difference from the chosen time and the current time in minutes. So let's say the current time is 09/22/2015 5:53 PM and the chosen time is 09/22/2015 5:41 PM - it will tell me the difference which is 12 minutes.
What I want to know is how I can tell if those 12 minutes are into the future or in the past. I want my application to only proceed if the chosen time is at least 5 minutes into the future.
You're doing too much work. Just use DateTime() to do the date math for you:
// Wrong way to do this. Work with timezones instead
$cur_date = (new DateTime()->modify("+1 hours"));
// Assuming acceptable format for $chosen_date
$to_time = new DateTime($chosen_date);
$diff = $cur_date->diff($to_time);
if ($diff->format('%R') === '-') {
// in the past
}
echo $diff->format('%i') . ' minutes';
Demo
$enteredDate = new DateTime($chosen_date)->getTimestamp();
$now = new DateTime()->getTimestamp();
if(($enteredDate-$now)/60 >=5)echo 'ok';
Basically, the code takes the two dates converted in seconds since 1/1/1970. We calculate the difference between the two dates and divide the result by 60 as we want minutes. If there is a difference of at least 5 minutes, we're ok. If the number is negative, then we are in the past.
If anyone is looking to do something similar, I found the Carbon library which is included by default with the framework I am using (Laravel 5), it was much easier to do this calculation.
$chosen_date = new Carbon($chosen_date, 'Europe/London');
$whitelist_date = Carbon::now('Europe/London');
$whitelist_date->addMinutes(10);
echo "Chosen date must be after this date: ".$whitelist_date ."</br>";
echo "Chosen Date: ".$chosen_date ."</br>";
if ($chosen_date->gt($whitelist_date)) {
echo "proceed";
} else {
echo "dont proceed";
}
I need to create a PHP script that pulls the timestamps of various stuff from a database (logs, messages, logins, etc) and removes them if they are older than X amount of days. I am poor at doing work with time and am a bit stumped on the best way to do this.
I realize I could separate the day/month/year in the string using explode() and compare these with a bunch of If statements, but would like to use a more efficient method. Something like the following would be the correct way to do this correct?
$dt = "2011-03-19 10:05:44";
//if $dt is older than 90 days
if((time()-(60*24*90)) > strtotime($dt))
{
}
Subtract (minutes*hours*days) from time() or are the numbers wrong?
You can use DateTime class for this. Example:
$dt = "2011-03-19 10:05:44";
$date = new DateTime($dt);
$now = new DateTime();
$diff = $now->diff($date);
if($diff->days > 90) {
echo 'its greater than 90 days';
}
I have a problem.
I have a certain date/time (A), which is put in a variable. Lets say its May 06 2014 14:26.
I want to compare this date/time with file's modification date/time (B), and if it is the same, I put the file's modification date/time (B) in variable too.
The thing is, I cant get exactly the same date on file (B). So, I want that it would add 5 minutes difference. For example, if file (B) has modification date May 06 2014 14:28, it will be put in a variable. Or if it has modification date May 06 2014 14:22, it will be put in a variable too.
If it helps, I am using date("F d Y H:i",$file['filetime']) command to get the modification date of the file.
Any possibility to do this? Thanks in advance.
If something is unclear, just tell me. I'm new here, so might be hard to explain things correctly.
Maybe, it helps:
$datetimeA = strtotime($file1['filetime']);
$datetimeB = strtotime($file2['filetime']);
$interval = abs($datetimeA - $datetimeB);
$minutes = round($interval / 60);
if ($minutes > 5) {
//do some magic here
}
If $file['filetime'] is a timestamp already, then You can use it without calling strtotime().
With the DateTime class, it is done in a few lines :
$datetime1 = new DateTime('2009-10-13 10:00:00');
$datetime2 = new DateTime('2009-10-13 10:20:00');
$interval = $datetime1->diff($datetime2);
$yourIntervalle = $interval->format('%i minutes'));
i'd either directly use unix-timestamps or convert A and B to Unix Timestamps (e.g. using strtotime) and compare them based on your requirements.
if you have access to the file directly you could even use filemtime to directly get the last modified time as an unix timestamp.
Guess this is what you're looking for, if your problem is just to add 5 minutes:
$dateB = new DateTime('2014-05-06 14:26:00');
$interval = new DateInterval('PT5M');
$dateB->add($interval);
print_r($dateB);
PHPSandbox: http://sandbox.onlinephpfunctions.com/code/9f9a2ee40f09f953c796c9c2dd7e15ad62b45772
Also, look at DateInterval to understand a little more:
http://www.php.net/manual/en/dateinterval.construct.php
you can do like. if you want to minus 5 minutes from the date
$given_date = 'May 06 2014 14:28';
$date = new DateTime($given_date);
//subtract 5 minutes from the date
$new_date = $date->sub(new DateInterval('PT' . '5' . 'M'));
echo $new_date->format('F d Y H:i');
if you want to add 5 minutes then change
//add 5 minutes to the date
$new_date = $date->add(new DateInterval('PT' . '5' . 'M'));
First of all, i think you need to compare the two date/time by the method strtotime. With that you can compare the two date.
Then, you just need to make one or two insert in your database if i understand correctly with a If/Else method.
Hope it helps!
I'm trying to convert this "2012-03-27 16:01:48 CEST" into "1 hour and 22 minutes since". Preferably automatic time-zone management.
I can not change how the time is set. It will always be "2012-03-27 16:01:48 CEST" or something similar. Any ideas?
I'm open for anything!
I love DateTime!
$a = new DateTime('2012-03-27 16:01:48 CEST');
$b = new DateTime();
$diff = $b->diff($a);
echo $diff->h,' hours and ',$diff->i,' minutes';
Take a look at: http://www.datejs.com/ It's a handy library for formatting and calculating dates.
Check php gmdate() function