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I have a dynamic date, now what i want is that finding the date after exact one week, i have achieved that with the code below, but now i want that now many days are left for that week after date to come. i have got some sort of time stamp, but i don't know how to convert it to DAYS LEFT.
$weekDate = date( "d/m/Y", strtotime("19-05-2014") + 86400 * 7 );
echo $weekDate;// THATS PERFECT
////////////////////////////////////////////////////////////////
$future = strtotime( $weekDate ); //Future date.
$datediff = time() - $future;
$days = floor( ( ( $datediff / 24 ) / 60 ) / 60 ); //this is not perfect, returns some
sort of timestamp
I have tried other methods which are fine, but if week completes on 26, and today is 25th it gives me 0 days left, but it should say 1 day left. please help me.
In your $date_diff now is less than the future date thats why its zero. Inside strtotime() function, you can directly put a relative date inside. In this case, for one week you can use +1 week or +7 days. Consider this example:
$next_week = date('d/m/Y', strtotime('19-05-2014 +1 week')); // 26/05/2014
$next_week = strtotime('19-05-2014 +7 days');
$difference = $next_week - time(); // next weeks date minus todays date
$difference = date('j', $difference);
echo $difference . (($difference > 1) ? ' days ' : ' day ') . ' left';
// should output: 1 day left
Alright. I did something. Here's the code
$startDate = strtotime("19-05-2014");
$endDate = $startDate + 604800;
$diff = ($endDate - time()) / 60 / 60 / 24;
if ($diff < 1 && $diff > 0) {
$days = 1;
} else {
$days = floor($diff);
}
echo $days;
The problem you have with getting "1 day" if the date is tomorrow is the floor method. strtotime() gives you the time at 0 a.m. if you don't set it by your own. Because of that the difference between now and tomorrow is less than 1 which is 0 if you floor that. I created an if-clause for that.
But that will give you "1 day" for today and "1 day" for yesterday (last 2 days before the final date). If you want that better, you have to specify time in your initial date (19-05-2014).
Use DateTime for date and time calculations.
$weekDate = new \DateTime('+ 1 week');
$future = new \DateTime('+ 3 days');
$daysLeft = $weekDate->diff($future)->days;
echo $daysLeft; //4
See it working.
Reference http://php.net/datetime
How do I calculate the difference between two dates in hours?
For example:
day1=2006-04-12 12:30:00
day2=2006-04-14 11:30:00
In this case the result should be 47 hours.
The newer PHP-Versions provide some new classes called DateTime, DateInterval, DateTimeZone and DatePeriod. The cool thing about this classes is, that it considers different timezones, leap years, leap seconds, summertime, etc. And on top of that it's very easy to use. Here's what you want with the help of this objects:
// Create two new DateTime-objects...
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2006-04-14T11:30:00');
// The diff-methods returns a new DateInterval-object...
$diff = $date2->diff($date1);
// Call the format method on the DateInterval-object
echo $diff->format('%a Day and %h hours');
The DateInterval-object, which is returned also provides other methods than format. If you want the result in hours only, you could to something like this:
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2006-04-14T11:30:00');
$diff = $date2->diff($date1);
$hours = $diff->h;
$hours = $hours + ($diff->days*24);
echo $hours;
And here are the links for documentation:
DateTime-Class
DateTimeZone-Class
DateInterval-Class
DatePeriod-Class
All these classes also offer a procedural/functional way to operate with dates. Therefore take a look at the overview: http://php.net/manual/book.datetime.php
$t1 = strtotime( '2006-04-14 11:30:00' );
$t2 = strtotime( '2006-04-12 12:30:00' );
$diff = $t1 - $t2;
$hours = $diff / ( 60 * 60 );
To provide another method for DatePeriod when using the UTC or GMT timezone.
Count Hours https://3v4l.org/Mu3HD
$start = new \DateTime('2006-04-12T12:30:00');
$end = new \DateTime('2006-04-14T11:30:00');
//determine what interval should be used - can change to weeks, months, etc
$interval = new \DateInterval('PT1H');
//create periods every hour between the two dates
$periods = new \DatePeriod($start, $interval, $end);
//count the number of objects within the periods
$hours = iterator_count($periods);
echo $hours . ' hours';
//difference between Unix Epoch
$diff = $end->getTimestamp() - $start->getTimestamp();
$hours = $diff / ( 60 * 60 );
echo $hours . ' hours (60 * 60)';
//difference between days
$diff = $end->diff($start);
$hours = $diff->h + ($diff->days * 24);
echo $hours . ' hours (days * 24)';
Result
47 hours (iterator_count)
47 hours (60 * 60)
47 hours (days * 24)
Count Hours with Daylight Savings https://3v4l.org/QBQUB
Please be advised that DatePeriod excludes an hour for DST but does not add another hour when DST ends. So its usage is subjective to your desired outcome and date range.
See the current bug report
//set timezone to UTC to disregard daylight savings
date_default_timezone_set('America/New_York');
$interval = new \DateInterval('PT1H');
//DST starts Apr. 2nd 02:00 and moves to 03:00
$start = new \DateTime('2006-04-01T12:00:00');
$end = new \DateTime('2006-04-02T12:00:00');
$periods = new \DatePeriod($start, $interval, $end);
$hours = iterator_count($periods);
echo $hours . ' hours';
//DST ends Oct. 29th 02:00 and moves to 01:00
$start = new \DateTime('2006-10-28T12:00:00');
$end = new \DateTime('2006-10-29T12:00:00');
$periods = new \DatePeriod($start, $interval, $end);
$hours = iterator_count($periods);
echo $hours . ' hours';
Result
#2006-04-01 12:00 EST to 2006-04-02 12:00 EDT
23 hours (iterator_count)
//23 hours (60 * 60)
//24 hours (days * 24)
#2006-10-28 12:00 EDT to 2006-10-29 12:00 EST
24 hours (iterator_count)
//25 hours (60 * 60)
//24 hours (days * 24)
#2006-01-01 12:00 EST to 2007-01-01 12:00 EST
8759 hours (iterator_count)
//8760 hours (60 * 60)
//8760 hours (days * 24)
//------
#2006-04-01 12:00 UTC to 2006-04-02 12:00 UTC
24 hours (iterator_count)
//24 hours (60 * 60)
//24 hours (days * 24)
#2006-10-28 12:00 UTC to 2006-10-29 12:00 UTC
24 hours (iterator_count)
//24 hours (60 * 60)
//24 hours (days * 24)
#2006-01-01 12:00 UTC to 2007-01-01 12:00 UTC
8760 hours (iterator_count)
//8760 hours (60 * 60)
//8760 hours (days * 24)
your answer is:
round((strtotime($day2) - strtotime($day1))/(60*60))
The easiest way to get the correct number of hours between two dates (datetimes), even across daylight saving time changes, is to use the difference in Unix timestamps. Unix timestamps are seconds elapsed since 1970-01-01T00:00:00 UTC, ignoring leap seconds (this is OK because you probably don't need this precision, and because it's quite difficult to take leap seconds into account).
The most flexible way to convert a datetime string with optional timezone information into a Unix timestamp is to construct a DateTime object (optionally with a DateTimeZone as a second argument in the constructor), and then call its getTimestamp method.
$str1 = '2006-04-12 12:30:00';
$str2 = '2006-04-14 11:30:00';
$tz1 = new DateTimeZone('Pacific/Apia');
$tz2 = $tz1;
$d1 = new DateTime($str1, $tz1); // tz is optional,
$d2 = new DateTime($str2, $tz2); // and ignored if str contains tz offset
$delta_h = ($d2->getTimestamp() - $d1->getTimestamp()) / 3600;
if ($rounded_result) {
$delta_h = round ($delta_h);
} else if ($truncated_result) {
$delta_h = intval($delta_h);
}
echo "Δh: $delta_h\n";
//Calculate number of hours between pass and now
$dayinpass = "2013-06-23 05:09:12";
$today = time();
$dayinpass= strtotime($dayinpass);
echo round(abs($today-$dayinpass)/60/60);
<?
$day1 = "2014-01-26 11:30:00";
$day1 = strtotime($day1);
$day2 = "2014-01-26 12:30:00";
$day2 = strtotime($day2);
$diffHours = round(($day2 - $day1) / 3600);
echo $diffHours;
?>
$day1 = "2006-04-12 12:30:00"
$day1 = strtotime($day1);
$day2 = "2006-04-14 11:30:00"
$day2 = strtotime($day2);
$diffHours = round(($day2 - $day1) / 3600);
I guess strtotime() function accept this date format.
Unfortunately the solution provided by FaileN doesn't work as stated by Walter Tross.. days may not be 24 hours!
I like to use the PHP Objects where possible and for a bit more flexibility I have come up with the following function:
/**
* #param DateTimeInterface $a
* #param DateTimeInterface $b
* #param bool $absolute Should the interval be forced to be positive?
* #param string $cap The greatest time unit to allow
*
* #return DateInterval The difference as a time only interval
*/
function time_diff(DateTimeInterface $a, DateTimeInterface $b, $absolute=false, $cap='H'){
// Get unix timestamps, note getTimeStamp() is limited
$b_raw = intval($b->format("U"));
$a_raw = intval($a->format("U"));
// Initial Interval properties
$h = 0;
$m = 0;
$invert = 0;
// Is interval negative?
if(!$absolute && $b_raw<$a_raw){
$invert = 1;
}
// Working diff, reduced as larger time units are calculated
$working = abs($b_raw-$a_raw);
// If capped at hours, calc and remove hours, cap at minutes
if($cap == 'H') {
$h = intval($working/3600);
$working -= $h * 3600;
$cap = 'M';
}
// If capped at minutes, calc and remove minutes
if($cap == 'M') {
$m = intval($working/60);
$working -= $m * 60;
}
// Seconds remain
$s = $working;
// Build interval and invert if necessary
$interval = new DateInterval('PT'.$h.'H'.$m.'M'.$s.'S');
$interval->invert=$invert;
return $interval;
}
This like date_diff() creates a DateTimeInterval, but with the highest unit as hours rather than years.. it can be formatted as usual.
$interval = time_diff($date_a, $date_b);
echo $interval->format('%r%H'); // For hours (with sign)
N.B. I have used format('U') instead of getTimestamp() because of the comment in the manual. Also note that 64-bit is required for post-epoch and pre-negative-epoch dates!
Carbon could also be a nice way to go.
From their website:
A simple PHP API extension for DateTime. http://carbon.nesbot.com/
Example:
use Carbon\Carbon;
//...
$day1 = Carbon::createFromFormat('Y-m-d H:i:s', '2006-04-12 12:30:00');
$day2 = Carbon::createFromFormat('Y-m-d H:i:s', '2006-04-14 11:30:00');
echo $day1->diffInHours($day2); // 47
//...
Carbon extends the DateTime class to inherit methods including diff(). It adds nice sugars like diffInHours, diffInMintutes, diffInSeconds e.t.c.
This function helps you to calculate exact years and months between two given dates, $doj1 and $doj. It returns example 4.3 means 4 years and 3 month.
<?php
function cal_exp($doj1)
{
$doj1=strtotime($doj1);
$doj=date("m/d/Y",$doj1); //till date or any given date
$now=date("m/d/Y");
//$b=strtotime($b1);
//echo $c=$b1-$a2;
//echo date("Y-m-d H:i:s",$c);
$year=date("Y");
//$chk_leap=is_leapyear($year);
//$year_diff=365.25;
$x=explode("/",$doj);
$y1=explode("/",$now);
$yy=$x[2];
$mm=$x[0];
$dd=$x[1];
$yy1=$y1[2];
$mm1=$y1[0];
$dd1=$y1[1];
$mn=0;
$mn1=0;
$ye=0;
if($mm1>$mm)
{
$mn=$mm1-$mm;
if($dd1<$dd)
{
$mn=$mn-1;
}
$ye=$yy1-$yy;
}
else if($mm1<$mm)
{
$mn=12-$mm;
//$mn=$mn;
if($mm!=1)
{
$mn1=$mm1-1;
}
$mn+=$mn1;
if($dd1>$dd)
{
$mn+=1;
}
$yy=$yy+1;
$ye=$yy1-$yy;
}
else
{
$ye=$yy1-$yy;
$ye=$ye-1;
$mn=12-1;
if($dd1>$dd)
{
$ye+=1;
$mn=0;
}
}
$to=$ye." year and ".$mn." months";
return $ye.".".$mn;
/*return daysDiff($x[2],$x[0],$x[1]);
$days=dateDiff("/",$now,$doj)/$year_diff;
$days_exp=explode(".",$days);
return $years_exp=$days; //number of years exp*/
}
?>
In addition to #fyrye's very helpful answer this is an okayish workaround for the mentioned bug (this one), that DatePeriod substracts one hour when entering summertime, but doesn't add one hour when leaving summertime (and thus Europe/Berlin's March has its correct 743 hours but October has 744 instead of 745 hours):
Counting the hours of a month (or any timespan), considering DST-transitions in both directions
function getMonthHours(string $year, string $month, \DateTimeZone $timezone): int
{
// or whatever start and end \DateTimeInterface objects you like
$start = new \DateTimeImmutable($year . '-' . $month . '-01 00:00:00', $timezone);
$end = new \DateTimeImmutable((new \DateTimeImmutable($year . '-' . $month . '-01 23:59:59', $timezone))->format('Y-m-t H:i:s'), $timezone);
// count the hours just utilizing \DatePeriod, \DateInterval and iterator_count, hell yeah!
$hours = iterator_count(new \DatePeriod($start, new \DateInterval('PT1H'), $end));
// find transitions and check, if there is one that leads to a positive offset
// that isn't added by \DatePeriod
// this is the workaround for https://bugs.php.net/bug.php?id=75685
$transitions = $timezone->getTransitions((int)$start->format('U'), (int)$end->format('U'));
if (2 === count($transitions) && $transitions[0]['offset'] - $transitions[1]['offset'] > 0) {
$hours += (round(($transitions[0]['offset'] - $transitions[1]['offset'])/3600));
}
return $hours;
}
$myTimezoneWithDST = new \DateTimeZone('Europe/Berlin');
var_dump(getMonthHours('2020', '01', $myTimezoneWithDST)); // 744
var_dump(getMonthHours('2020', '03', $myTimezoneWithDST)); // 743
var_dump(getMonthHours('2020', '10', $myTimezoneWithDST)); // 745, finally!
$myTimezoneWithoutDST = new \DateTimeZone('UTC');
var_dump(getMonthHours('2020', '01', $myTimezoneWithoutDST)); // 744
var_dump(getMonthHours('2020', '03', $myTimezoneWithoutDST)); // 744
var_dump(getMonthHours('2020', '10', $myTimezoneWithoutDST)); // 744
P.S. If you check a (longer) timespan, which leads to more than those two transitions, my workaround won't touch the counted hours to reduce the potential of funny side effects. In such cases, a more complicated solution must be implemented. One could iterate over all found transitions and compare the current with the last and check if it is one with DST true->false.
$diff_min = ( strtotime( $day2 ) - strtotime( $day1 ) ) / 60 / 60;
$total_time = $diff_min;
You can try this one.
// Create two new DateTime-objects...
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2006-04-14T11:30:00');
// The diff-method returns difference in days...
$diffInDays = $date2->diffInDays($date1);
// The diff-method returns difference in hours...
$diffInHours = $date2->diffInHours($date1);
// The diff-method returns difference in mintes...
$diffInMinutes = $date2->diffInMinutes($date1);
The second part of the answer from #fidi doesn't factor in months/years.
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2010-04-14T11:30:00');
$diff = $date2->diff($date1);
$hours = $diff->h;
$days = intval($diff->format('%a'));
$hours = $hours + ($days*24);
echo $hours;
This is working in my project. I think, This will be helpful for you.
If Date is in past then invert will 1.
If Date is in future then invert will 0.
$defaultDate = date('Y-m-d');
$datetime1 = new DateTime('2013-03-10');
$datetime2 = new DateTime($defaultDate);
$interval = $datetime1->diff($datetime2);
$days = $interval->format('%a');
$invert = $interval->invert;
To pass a unix timestamp use this notation
$now = time();
$now = new DateTime("#$now");
Scenario: An record was entered into the database.
I am trying to figure out the following equations:
How to get the number of hours since the record was added.
How to get how many hours are left until midnight since the record
was added.
Given these times:
Date / Time: 2012-08-22 20:11:20
Time Stamp: 1345684280
Midnight Tonight: 2012-08-23 00:00:00
Midnight Time Stamp: 1345698000
I feel like I'm on the right track. Just need some proper math to do the calculations? I am horrible at math. Any help or guidance would be appreciated. I'm not looking for someone to COMPLETE THIS FOR ME. Just looking for advice on what I'm doing wrong, or how I could do it better. Maybe explain the math formulas necessary to achieve my goal.
Here is what I have so far:
class tools{
public function __construct(){
}
public function check_time($time, $request){
$time = strtotime($time);
if($request == 'since'){
$theTime = time() - $time;
$prefix = 'Since:';
} elseif($request == 'until'){
$midnight = mktime(0, 0, 0, date('n'), date('j'), date('Y'));
$theTime = $midnight - $time;
$prefix = 'Until:';
}
$tokens = array (
31536000 => 'year',
2592000 => 'month',
604800 => 'week',
86400 => 'day',
3600 => 'hour',
60 => 'minute',
1 => 'second'
);
foreach($tokens as $unit => $text){
if($theTime < $unit) continue;
$duration = floor($theTime / $unit);
return $prefix.' '.$duration.' '.$text.(($duration>1)?'s':'');
}
}
}// EoF tools class
$tools = new tools();
print_r($tools->check_time('2012-08-22 20:11:20', 'since'));
print_r($tools->check_time('2012-08-22 20:11:20', 'until'));
The solution here is very simple. There is a minor error that's causing all of your issues.
In your code you have this to calculate midnight.
$midnight = mktime(0, 0, 0, date('n'), date('j'), date('Y'));
This is incorrect for the simple fact that it's using TODAY's midnight (Which would have been 00:00 today, however many hours ago from now. You want midnight TOMORROW, since it's considered 00:00 on 24 hour time and is tomorrow. The correct way to do it is just like this:
$midnight = strtotime("tomorrow 00:00:00");
Just keep in mind that strtotime() bases everything off of GMT, so make sure you set a default timezone in the file/application.
I hope my answer is clear and explains why the code you posted is wrong and how to fix it.
Maybe something like this? I have to admit to not completely understanding what your desired output is:
$d1 = new DateTime('2012-08-22 20:11:20');
$d2 = new DateTime('2012-08-23 00:00:00');
$interval = $d1->diff($d2);
echo $interval->format('%h hours %i minutes and %s seconds');
Nice and easy:
$timeLeft = 86400 - (time() - strtotime("today"));
echo date("H:i:s", $timeLeft);
86400 is the initial time of a day.
time() is the current time.
strtotime("today") is the starttime of this day.
date("H:i:s", $timeLeft) is for the formatting in hours, minutes and seconds.
Even shorter way:
date("H:i:s", strtotime("tomorrow") - time())
midnight is not more than the next day without specifying time the best way to do it must be :
<?php
$datetime1 = new DateTime(date('Y-m-d H:i:s'));//current datetime object
$datetime2 = new DateTime(date('Y-m-').date(d));//next day at midnight
$interval = $datetime1->diff($datetime2);//diference
echo $interval->format('H');printing only hours (same as date format)
?>
if you want to know more : php date_diff
You can try this:
$now = strtotime('2012-08-22 20:11:20');
$midnight = strtotime('2012-08-23 00:00:00');
$difference = $midnight - $now;
echo date("H:i:s", $difference);
So I have a script that does multiple checks for 32, 48 and 72 hours ago.
Basically I check my database for entries that are at least x hours old.
Now this works fine like this:
$date = date('Y-m-d H:i:s',strtotime('-32 hours'));
$q = "SELECT * FROM `table` WHERE `date` <= '".$date."'";
Now I want this to exclude weekends. I know you can use weekdays within strtotime to get this effect however this doesn't work for hours.
For 48 hours it's easy because I can simply do the following:
echo date('Y-m-d H:i:s',
strtotime(date("Y-m-d H:i:s").
" -2 weekdays ".
date('H:i:s')));
For 72 hours it's also easy because it's 3 days. However 32 hours poses a problem because it's ±1.3 days.
In conclusion, how do I get the datetime of 32 hours ago excluding weekends.
Use strtotime as you had initially:
$time = strtotime('-32 hours');
Then do the weekend/weekday calculation manually.
// If the day is Sunday or Saturday subtract a full day.
while (date('w', $time) % 6 == 0) {
$time = strtotime('-1 day', $time);
}
$date = date('Y-m-d H:i:s', $time);
I am not sure if this is correct or the best way to do it but something like:
function getDateBackExcludingWeekend( $hours ) {
$now = time();
$secondsBack = $hours * 3600;
$actual = $now - $secondsBack;
$monday = strtotime("last monday");
if( $actual < $monday ) {
$diff = ($secondsBack - ($now - $monday));
$backthen = ($monday - 172800 /* two days */) - $diff;
return date("Y-m-d H:i:s", $backthen);
}
return date("Y-m-d H:i:s", $actual);
}
Why not just remove two days and add 16 hours semi-manually to make up for it?
$DateTMP = date('Y-m-d h:i:s',(strtotime(date(Y-m-d)." -2 weekdays") + (60 * 60 * 16)));
How do I calculate the difference between two dates in hours?
For example:
day1=2006-04-12 12:30:00
day2=2006-04-14 11:30:00
In this case the result should be 47 hours.
The newer PHP-Versions provide some new classes called DateTime, DateInterval, DateTimeZone and DatePeriod. The cool thing about this classes is, that it considers different timezones, leap years, leap seconds, summertime, etc. And on top of that it's very easy to use. Here's what you want with the help of this objects:
// Create two new DateTime-objects...
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2006-04-14T11:30:00');
// The diff-methods returns a new DateInterval-object...
$diff = $date2->diff($date1);
// Call the format method on the DateInterval-object
echo $diff->format('%a Day and %h hours');
The DateInterval-object, which is returned also provides other methods than format. If you want the result in hours only, you could to something like this:
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2006-04-14T11:30:00');
$diff = $date2->diff($date1);
$hours = $diff->h;
$hours = $hours + ($diff->days*24);
echo $hours;
And here are the links for documentation:
DateTime-Class
DateTimeZone-Class
DateInterval-Class
DatePeriod-Class
All these classes also offer a procedural/functional way to operate with dates. Therefore take a look at the overview: http://php.net/manual/book.datetime.php
$t1 = strtotime( '2006-04-14 11:30:00' );
$t2 = strtotime( '2006-04-12 12:30:00' );
$diff = $t1 - $t2;
$hours = $diff / ( 60 * 60 );
To provide another method for DatePeriod when using the UTC or GMT timezone.
Count Hours https://3v4l.org/Mu3HD
$start = new \DateTime('2006-04-12T12:30:00');
$end = new \DateTime('2006-04-14T11:30:00');
//determine what interval should be used - can change to weeks, months, etc
$interval = new \DateInterval('PT1H');
//create periods every hour between the two dates
$periods = new \DatePeriod($start, $interval, $end);
//count the number of objects within the periods
$hours = iterator_count($periods);
echo $hours . ' hours';
//difference between Unix Epoch
$diff = $end->getTimestamp() - $start->getTimestamp();
$hours = $diff / ( 60 * 60 );
echo $hours . ' hours (60 * 60)';
//difference between days
$diff = $end->diff($start);
$hours = $diff->h + ($diff->days * 24);
echo $hours . ' hours (days * 24)';
Result
47 hours (iterator_count)
47 hours (60 * 60)
47 hours (days * 24)
Count Hours with Daylight Savings https://3v4l.org/QBQUB
Please be advised that DatePeriod excludes an hour for DST but does not add another hour when DST ends. So its usage is subjective to your desired outcome and date range.
See the current bug report
//set timezone to UTC to disregard daylight savings
date_default_timezone_set('America/New_York');
$interval = new \DateInterval('PT1H');
//DST starts Apr. 2nd 02:00 and moves to 03:00
$start = new \DateTime('2006-04-01T12:00:00');
$end = new \DateTime('2006-04-02T12:00:00');
$periods = new \DatePeriod($start, $interval, $end);
$hours = iterator_count($periods);
echo $hours . ' hours';
//DST ends Oct. 29th 02:00 and moves to 01:00
$start = new \DateTime('2006-10-28T12:00:00');
$end = new \DateTime('2006-10-29T12:00:00');
$periods = new \DatePeriod($start, $interval, $end);
$hours = iterator_count($periods);
echo $hours . ' hours';
Result
#2006-04-01 12:00 EST to 2006-04-02 12:00 EDT
23 hours (iterator_count)
//23 hours (60 * 60)
//24 hours (days * 24)
#2006-10-28 12:00 EDT to 2006-10-29 12:00 EST
24 hours (iterator_count)
//25 hours (60 * 60)
//24 hours (days * 24)
#2006-01-01 12:00 EST to 2007-01-01 12:00 EST
8759 hours (iterator_count)
//8760 hours (60 * 60)
//8760 hours (days * 24)
//------
#2006-04-01 12:00 UTC to 2006-04-02 12:00 UTC
24 hours (iterator_count)
//24 hours (60 * 60)
//24 hours (days * 24)
#2006-10-28 12:00 UTC to 2006-10-29 12:00 UTC
24 hours (iterator_count)
//24 hours (60 * 60)
//24 hours (days * 24)
#2006-01-01 12:00 UTC to 2007-01-01 12:00 UTC
8760 hours (iterator_count)
//8760 hours (60 * 60)
//8760 hours (days * 24)
your answer is:
round((strtotime($day2) - strtotime($day1))/(60*60))
The easiest way to get the correct number of hours between two dates (datetimes), even across daylight saving time changes, is to use the difference in Unix timestamps. Unix timestamps are seconds elapsed since 1970-01-01T00:00:00 UTC, ignoring leap seconds (this is OK because you probably don't need this precision, and because it's quite difficult to take leap seconds into account).
The most flexible way to convert a datetime string with optional timezone information into a Unix timestamp is to construct a DateTime object (optionally with a DateTimeZone as a second argument in the constructor), and then call its getTimestamp method.
$str1 = '2006-04-12 12:30:00';
$str2 = '2006-04-14 11:30:00';
$tz1 = new DateTimeZone('Pacific/Apia');
$tz2 = $tz1;
$d1 = new DateTime($str1, $tz1); // tz is optional,
$d2 = new DateTime($str2, $tz2); // and ignored if str contains tz offset
$delta_h = ($d2->getTimestamp() - $d1->getTimestamp()) / 3600;
if ($rounded_result) {
$delta_h = round ($delta_h);
} else if ($truncated_result) {
$delta_h = intval($delta_h);
}
echo "Δh: $delta_h\n";
//Calculate number of hours between pass and now
$dayinpass = "2013-06-23 05:09:12";
$today = time();
$dayinpass= strtotime($dayinpass);
echo round(abs($today-$dayinpass)/60/60);
<?
$day1 = "2014-01-26 11:30:00";
$day1 = strtotime($day1);
$day2 = "2014-01-26 12:30:00";
$day2 = strtotime($day2);
$diffHours = round(($day2 - $day1) / 3600);
echo $diffHours;
?>
$day1 = "2006-04-12 12:30:00"
$day1 = strtotime($day1);
$day2 = "2006-04-14 11:30:00"
$day2 = strtotime($day2);
$diffHours = round(($day2 - $day1) / 3600);
I guess strtotime() function accept this date format.
Unfortunately the solution provided by FaileN doesn't work as stated by Walter Tross.. days may not be 24 hours!
I like to use the PHP Objects where possible and for a bit more flexibility I have come up with the following function:
/**
* #param DateTimeInterface $a
* #param DateTimeInterface $b
* #param bool $absolute Should the interval be forced to be positive?
* #param string $cap The greatest time unit to allow
*
* #return DateInterval The difference as a time only interval
*/
function time_diff(DateTimeInterface $a, DateTimeInterface $b, $absolute=false, $cap='H'){
// Get unix timestamps, note getTimeStamp() is limited
$b_raw = intval($b->format("U"));
$a_raw = intval($a->format("U"));
// Initial Interval properties
$h = 0;
$m = 0;
$invert = 0;
// Is interval negative?
if(!$absolute && $b_raw<$a_raw){
$invert = 1;
}
// Working diff, reduced as larger time units are calculated
$working = abs($b_raw-$a_raw);
// If capped at hours, calc and remove hours, cap at minutes
if($cap == 'H') {
$h = intval($working/3600);
$working -= $h * 3600;
$cap = 'M';
}
// If capped at minutes, calc and remove minutes
if($cap == 'M') {
$m = intval($working/60);
$working -= $m * 60;
}
// Seconds remain
$s = $working;
// Build interval and invert if necessary
$interval = new DateInterval('PT'.$h.'H'.$m.'M'.$s.'S');
$interval->invert=$invert;
return $interval;
}
This like date_diff() creates a DateTimeInterval, but with the highest unit as hours rather than years.. it can be formatted as usual.
$interval = time_diff($date_a, $date_b);
echo $interval->format('%r%H'); // For hours (with sign)
N.B. I have used format('U') instead of getTimestamp() because of the comment in the manual. Also note that 64-bit is required for post-epoch and pre-negative-epoch dates!
Carbon could also be a nice way to go.
From their website:
A simple PHP API extension for DateTime. http://carbon.nesbot.com/
Example:
use Carbon\Carbon;
//...
$day1 = Carbon::createFromFormat('Y-m-d H:i:s', '2006-04-12 12:30:00');
$day2 = Carbon::createFromFormat('Y-m-d H:i:s', '2006-04-14 11:30:00');
echo $day1->diffInHours($day2); // 47
//...
Carbon extends the DateTime class to inherit methods including diff(). It adds nice sugars like diffInHours, diffInMintutes, diffInSeconds e.t.c.
This function helps you to calculate exact years and months between two given dates, $doj1 and $doj. It returns example 4.3 means 4 years and 3 month.
<?php
function cal_exp($doj1)
{
$doj1=strtotime($doj1);
$doj=date("m/d/Y",$doj1); //till date or any given date
$now=date("m/d/Y");
//$b=strtotime($b1);
//echo $c=$b1-$a2;
//echo date("Y-m-d H:i:s",$c);
$year=date("Y");
//$chk_leap=is_leapyear($year);
//$year_diff=365.25;
$x=explode("/",$doj);
$y1=explode("/",$now);
$yy=$x[2];
$mm=$x[0];
$dd=$x[1];
$yy1=$y1[2];
$mm1=$y1[0];
$dd1=$y1[1];
$mn=0;
$mn1=0;
$ye=0;
if($mm1>$mm)
{
$mn=$mm1-$mm;
if($dd1<$dd)
{
$mn=$mn-1;
}
$ye=$yy1-$yy;
}
else if($mm1<$mm)
{
$mn=12-$mm;
//$mn=$mn;
if($mm!=1)
{
$mn1=$mm1-1;
}
$mn+=$mn1;
if($dd1>$dd)
{
$mn+=1;
}
$yy=$yy+1;
$ye=$yy1-$yy;
}
else
{
$ye=$yy1-$yy;
$ye=$ye-1;
$mn=12-1;
if($dd1>$dd)
{
$ye+=1;
$mn=0;
}
}
$to=$ye." year and ".$mn." months";
return $ye.".".$mn;
/*return daysDiff($x[2],$x[0],$x[1]);
$days=dateDiff("/",$now,$doj)/$year_diff;
$days_exp=explode(".",$days);
return $years_exp=$days; //number of years exp*/
}
?>
In addition to #fyrye's very helpful answer this is an okayish workaround for the mentioned bug (this one), that DatePeriod substracts one hour when entering summertime, but doesn't add one hour when leaving summertime (and thus Europe/Berlin's March has its correct 743 hours but October has 744 instead of 745 hours):
Counting the hours of a month (or any timespan), considering DST-transitions in both directions
function getMonthHours(string $year, string $month, \DateTimeZone $timezone): int
{
// or whatever start and end \DateTimeInterface objects you like
$start = new \DateTimeImmutable($year . '-' . $month . '-01 00:00:00', $timezone);
$end = new \DateTimeImmutable((new \DateTimeImmutable($year . '-' . $month . '-01 23:59:59', $timezone))->format('Y-m-t H:i:s'), $timezone);
// count the hours just utilizing \DatePeriod, \DateInterval and iterator_count, hell yeah!
$hours = iterator_count(new \DatePeriod($start, new \DateInterval('PT1H'), $end));
// find transitions and check, if there is one that leads to a positive offset
// that isn't added by \DatePeriod
// this is the workaround for https://bugs.php.net/bug.php?id=75685
$transitions = $timezone->getTransitions((int)$start->format('U'), (int)$end->format('U'));
if (2 === count($transitions) && $transitions[0]['offset'] - $transitions[1]['offset'] > 0) {
$hours += (round(($transitions[0]['offset'] - $transitions[1]['offset'])/3600));
}
return $hours;
}
$myTimezoneWithDST = new \DateTimeZone('Europe/Berlin');
var_dump(getMonthHours('2020', '01', $myTimezoneWithDST)); // 744
var_dump(getMonthHours('2020', '03', $myTimezoneWithDST)); // 743
var_dump(getMonthHours('2020', '10', $myTimezoneWithDST)); // 745, finally!
$myTimezoneWithoutDST = new \DateTimeZone('UTC');
var_dump(getMonthHours('2020', '01', $myTimezoneWithoutDST)); // 744
var_dump(getMonthHours('2020', '03', $myTimezoneWithoutDST)); // 744
var_dump(getMonthHours('2020', '10', $myTimezoneWithoutDST)); // 744
P.S. If you check a (longer) timespan, which leads to more than those two transitions, my workaround won't touch the counted hours to reduce the potential of funny side effects. In such cases, a more complicated solution must be implemented. One could iterate over all found transitions and compare the current with the last and check if it is one with DST true->false.
$diff_min = ( strtotime( $day2 ) - strtotime( $day1 ) ) / 60 / 60;
$total_time = $diff_min;
You can try this one.
// Create two new DateTime-objects...
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2006-04-14T11:30:00');
// The diff-method returns difference in days...
$diffInDays = $date2->diffInDays($date1);
// The diff-method returns difference in hours...
$diffInHours = $date2->diffInHours($date1);
// The diff-method returns difference in mintes...
$diffInMinutes = $date2->diffInMinutes($date1);
The second part of the answer from #fidi doesn't factor in months/years.
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2010-04-14T11:30:00');
$diff = $date2->diff($date1);
$hours = $diff->h;
$days = intval($diff->format('%a'));
$hours = $hours + ($days*24);
echo $hours;
This is working in my project. I think, This will be helpful for you.
If Date is in past then invert will 1.
If Date is in future then invert will 0.
$defaultDate = date('Y-m-d');
$datetime1 = new DateTime('2013-03-10');
$datetime2 = new DateTime($defaultDate);
$interval = $datetime1->diff($datetime2);
$days = $interval->format('%a');
$invert = $interval->invert;
To pass a unix timestamp use this notation
$now = time();
$now = new DateTime("#$now");