2009-10-05 18:11:08
2009-10-05 18:07:13
This should generate 235,how to do it ?
With DateTime objects, you can do it like this:
$date = new DateTime( '2009-10-05 18:07:13' );
$date2 = new DateTime( '2009-10-05 18:11:08' );
$diffInSeconds = $date2->getTimestamp() - $date->getTimestamp();
You can use strtotime() to do that:
$diff = strtotime('2009-10-05 18:11:08') - strtotime('2009-10-05 18:07:13')
A similar approach is possible with DateTime objects, e.g.
$date = new DateTime( '2009-10-05 18:07:13' );
$date2 = new DateTime( '2009-10-05 18:11:08' );
$diff = $date2->getTimestamp() - $date->getTimestamp();
PHP Date Time reference is helpful for things like this: PHP Date Time Functions
strtotime() is probably the best way.
$seconds = strtotime('2009-10-05 18:11:08') - strtotime('2009-10-05 18:07:13')
For those worrying about the limitations of using timestamps (i.e. using dates before 1970 and beyond 2038), you can simply calculate the difference in seconds like so:
$start = new DateTime('2009-10-05 18:11:08');
$end = new DateTime('2009-10-05 18:07:13');
$diff = $end->diff($start);
$daysInSecs = $diff->format('%r%a') * 24 * 60 * 60;
$hoursInSecs = $diff->h * 60 * 60;
$minsInSecs = $diff->i * 60;
$seconds = $daysInSecs + $hoursInSecs + $minsInSecs + $diff->s;
echo $seconds; // output: 235
Wrote a blog post for those interested in reading more.
Because of unix epoch limitations, you could have problems compairing dates before 1970 and after 2038. I choose to loose precision (=don't look at the single second) but avoid to pass trough unix epoch conversions (getTimestamp). It depends on what you are doing to do...
In my case, using 365 instead (12*30) and "30" as mean month lenght, reduced the error in an usable output.
function DateIntervalToSec($start,$end){ // as datetime object returns difference in seconds
$diff = $end->diff($start);
$diff_sec = $diff->format('%r').( // prepend the sign - if negative, change it to R if you want the +, too
($diff->s)+ // seconds (no errors)
(60*($diff->i))+ // minutes (no errors)
(60*60*($diff->h))+ // hours (no errors)
(24*60*60*($diff->d))+ // days (no errors)
(30*24*60*60*($diff->m))+ // months (???)
(365*24*60*60*($diff->y)) // years (???)
);
return $diff_sec;
}
Note that the error could be 0, if "mean" quantities are intended for diff. The PHP docs don't speaks about this...
In a bad case, error could be:
0 seconds if diff is applied to time gaps < 1 month
0 to 3 days if diff is applied to time gaps > 1 month
0 to 14 days if diff is applied to time gaps > 1 year
I prefer to suppose that somebody decided to consider "m" as 30 days and "y" as 365, charging "d" with the difference when "diff" walk trough non-30-days months...
If somebody knows something more about this and can provide official documentation, is welcome!
strtotime("2009-10-05 18:11:08") - strtotime("2009-10-05 18:07:13")
The solution proposed by #designcise is wrong when "end date" is before "start date".
Here is the corrected calculation
$diff = $start->diff($end);
$daysInSecs = $diff->format('%r%a') * 24 * 60 * 60;
$hoursInSecs = $diff->format('%r%h') * 60 * 60;
$minsInSecs = $diff->format('%r%i') * 60;
$seconds = $daysInSecs + $hoursInSecs + $minsInSecs + $diff->format('%r%s');
A simple and exact solution (exemplifying Nilz11's comment):
$hiDate = new DateTime("2310-05-22 08:33:26");
$loDate = new DateTime("1910-11-03 13:00:01");
$diff = $hiDate->diff($loDate);
$secs = ((($diff->format("%a") * 24) + $diff->format("%H")) * 60 +
$diff->format("%i")) * 60 + $diff->format("%s");
Related
I need to get different time lengths in minutes from a few timestamps that are:
starttime
endtime
starttime2nd
endtime2nd
Edit: clarification:
Each time is originally stored as a datetime string, like
"2018-02-21T19:45:13+00:00".
I take that and convert it to strtotime("2018-02-21T19:45:13+00:00");
And from that I get a timestamp : 1519242313
It doesn't seem that I can use plus or minus operators to add or subtract timestamps, like:
$length = ($endtime2nd - $starttime2nd) + ($endtime - $starttime)
Am I required to instantiate DateTime and use the "->diff" method to get a time interval?
I could get one time interval by doing this:
$date1 = new DateTime();
$date2 = new DateTime();
$starttime= $date1->setTimestamp($starttime);
$endtime= $date2->setTimestamp($endtime);
$length = $endtime->diff($starttime);
Does this mean that I need to instantiate four DateTimes to get the total length, and set four timestamps, then get the "->diff" for the two time intervals, and then add them using the "->add" method of DateTime method?
I would just like to know if there is a simpler method?
I don't think you need to instantiate DateTime and use the "->diff" method, because you already have timestamp (as i can see you are using setTimestamp)
<?php
$length = ($endtime2nd - $starttime2nd) + ($endtime - $starttime);
echo round(abs($length / 60), 2). " minute";
?>
You can get the total minuts like this.
$min = $length->d * 24 * 60;
$min = $min + $length->h * 60;
$min = $min + $length->m;
so, I substract two dates:
$d = $start->diff($end);
and now I want to get the date in seconds (not the second parameter). I know it can be done with a native Php function - but it only works above 1970. I know I have to somehow operate with format() method, but I dont get it...
You could access the public properties of the DateInterval class and do some math on it:
$seconds = $d->s + ($d->i * 60) + ($d->h * 3600) + ($d->d * 86400) + ($d->m * 2592000); // and so on
but once we get into the months there will be variance by +/- 2 days unless we stick to an arbitrary definition of a month as 2592000 secs (30 days).
You can also use the difference of the two UNIX timestamps from the DateTime objects (but you will end up having problems with the dates being less than year of 1970):
$seconds = $end->getTimestamp() - $start->getTimestamp();
The following seems to work, although I feel there should be a better way.
$dateIntrvl = $start->diff($end);
$days = $dateIntrvl->format('%a');
$hours = $dateIntrvl->format('%h');
$mins = $dateIntrvl->format('%i');
$secs = $dateIntrvl->format('%s');
$totalSeconds = ($days * 24 * 60 * 60) + ($hours * 60 * 60) + ($mins * 60) + $secs;
And yes, it seems to be working for dates earlier than 1970.
How about using a class DateTime / DateTimeImmutable to create current DateTime instance, then add your DateInterval $d by using the add() method, and then using the getTimestamp() method.
(new \DateTimeImmutable())->add($d)->getTimestamp()
To get number of seconds from now, just subtract time().
(new \DateTimeImmutable())->add($d)->getTimestamp() - \time()
I have something like that for example: 01:06:22 this represents 1hour, 6minutes and 22seconds. I want to take that, and multiple it by 6 and add it to some other hour such as 04:23 which is 4AM and 23Minutes not 4hours and 23 minutes.
Basically, as a result I expect that:
01:06:22
* 6 = 6hours 38minutes canceling the remaining seconds which are 12 in this case
Now, I want to take that and append it to other hour, 04:23 in this case, so the result would be:
11:01.
I have no clue how to start and do it, unfortunately.
Any help is appriciated!
Clarifications
The time that I have to multiple by 6 will never exceed 2 hours.
All the times are in the same format.
With DateTime it is simple:
$time = '01:06:22';
$dateSeconds = new DateTime("1970-01-01 $time UTC");
$seconds = $dateSeconds->getTimestamp() * 6;
$interval = new DateInterval('PT'.$seconds.'S');
$date = new DateTime('1970-01-01 04:23:00 UTC');
$date->add($interval);
echo $date->format('H:i:s');
Other solution with strtotime and gmdate. (Similar to Suresh but working):
$date = strtotime('1970-01-01 01:06:22 UTC');
$add = strtotime('1970-01-01 04:23:00 UTC');
$date = (($date*6)+$add);
echo gmdate('H:i:s', $date);
This is a solution if you want to implement it yourself.
The thing about timecode is that it can become really heavy with the if the if conditions etc if you don't do it right.
The best Way I thought of to deal with this is to convert everything to second.
so 01:06:22 would become:
numberOfSecond = 22 + 06 * 60 + 01 * 60 * 60
How to get the 22, 06 etc from the String? You can use Regex.
What you will need:
a function to extract the different values (hours, minute, second)
a function to convert the timecode into second
a function to convert back into timecode
the functions to multiply, add etc...
You might want to create a class for it.
You can try like this:
$date = strtotime('01:06:22');
$add = strtotime('00:04:23');
$date = ($date*6)+$add;
echo date('H:i:s', $date);
Note: Code is not tested.
First of all you want to multiply a time span by a factor. The easiest way to do this is to convert the span to seconds and do a straight multiply:
$date =DateTime::createFromFormat('!H:i:s', '01:06:22', new DateTimeZone('UTC'));
$seconds = $date->getTimestamp();
This code works by pretending that the time is a moment during the Unix epoch start so that it can then get the number of seconds elapsed since the epoch (the timestamp). That number is equal to the duration of the time span in seconds. However, it is vitally important that the input is interpreted as UTC time and not as something in your local time zone.
An equivalent way of doing things (as long as the input is in the correct format) which is lower-tech but perhaps less prone to bugs would be
list($h, $m, $s) = explode(':', '01:06:22');
$seconds = $h * 3600 + $m * 60 + $s;
Now the multiplication:
$seconds = $seconds * 6;
If you want to only keep whole minutes from the time you can do so at this stage:
$seconds = $seconds - $seconds % 60;
The final step of adding the result to a given "time" is not clearly specified yet -- does the reference time contain date information? What happens if adding to it goes over 24 hours?
Self explanatory :
$initialTime = '01:06:22';
$timeToAdd = '04:23';
$initialTimeExploded = explode( ':' ,$initialTime );
$initialTimeInMintues = ( $initialTimeExploded[0] * 60 ) + $initialTimeExploded[1];
$initialTimeInMintuesMultipliedBySix = $initialTimeInMintues * 6;
$timeToAddExploded = explode( ':' ,$timeToAdd );
$timeToAddExplodedInMintues = ( $timeToAddExploded[0] * 60 ) + $timeToAddExploded[1];
$newTimeInMinutes = $initialTimeInMintuesMultipliedBySix + $timeToAddExplodedInMintues;
$newTime = floor( $newTimeInMinutes / 60 ) .':' .($newTimeInMinutes % 60);
echo $newTime;
Result :
10:59
There is the following variable:
$datetime = '2012-09-09 01:40';
I need to extract hours and minutes, and then to transform them into minutes. In this example, I would need to get 100 (1 hr 40 min = 60 min + 40 min). How can I quickly do this using PHP functions?
The strtotime() and date() functions are not recommended anymore. Use the DateTime class.
$datetime = '2012-09-09 01:40';
$d = new DateTime($datetime);
var_dump( $d->format('G') * 60 + $d->format('i') );
$string = '2012-09-09 01:40';
$epoch = strtotime($string);
echo date('i', $epoch) + (60 * date('H', $epoch));
Outputs 100
Basically what happens here is the string date gets converted to Unix/Epoch time. Then, using date() it adds the number of minutes (i) to 60 times the number of hours (h).
$datetime = strtotime('2012-09-09 01:40');
$hour = date('H',$datetime);
$min = date('i',$datetime);
echo ($hour*60 + $min);
You can use preg_split like this:
$parts=preg_split("/(\d\d):(\d\d)/",$datetime,-1,PREG_SPLIT_DELIM_CAPTURE);
$mins=($parts[1]*60)+$parts[2];
Now $mins=100 when $datetime is like in your post
Ok so I am working on a calendar application within my CRM system and I need to find the upper and lower bounds of the half an hour surrorunding the timestamp at which somebody entered an event in the calendar in order to run some SQL on the DB to determine if they already have something booked in within that timeslot.
For example I have the timestamp of 1330518155 = 29 February 2012 16:22:35 GMT+4
so I need to get 1330516800 and 1330518600 which equal 16:00 and 16:30.
If anyone has any ideas or think I am approaching developing the calendar in a stupid way let me know! Its my first time on such a task involving so much work with times and dates so any advice appreciated!
Use modulo.
$prev = 1330518155 - (1330518155 % 1800);
$next = $prev + 1800;
The modulo operator gives the remainder part of division.
I didn't read the questions clearly, but this code will round to the nearest half hour, for those who don't need the range between the two. Uses some of SenorAmor's code. Props and his mad elegant solution to the correct question.
$time = 1330518155; //Or whatever your time is in unix timestamp
//Store how many seconds long our rounding interval is
//1800 equals one half hour
//Change this to whatever interval to round by
$INTERVAL_SECONDS = 1800; //30*60
//Find how far off the prior interval we are
$offset = ($time % $INTERVAL_SECONDS);
//Removing this offset takes us to the "round down" half hour
$rounded = $time - $offset;
//Now add the full interval if we should have rounded up
if($offset > ($INTERVAL_SECONDS/2)){
$nearestInterval = $rounded + $INTERVAL_SECONDS;
}
else{
$nearestInterval = $rounded
}
You could use the modulo operator.
$time -= $time % 3600; // nearest hour (always rounds down)
Hopefully this is enough to point you in the right direction, if not please add a comment and I'll try to craft a more specific example.
PHP does have a DateTime class and a whole slough of methods that it provides. You could use these if you like, but I find it easier to use the built-in date() and strtotime() functions.
Here's my solution:
// Assume $timestamp has the original timestamp, i.e. 2012-03-09 16:23:41
$day = date( 'Y-m-d', $timestamp ); // $day is now "2012-03-09"
$hour = (int)date( 'H', $timestamp ); // $hour is now (int)16
$minute = (int)date( 'i', $timestamp ); // $minute is now (int)23
if( $minute < 30 ){
$windowStart = strtotime( "$day $hour:00:00" );
$windowEnd = strtotime( "$day $hour:30:00" );
} else {
$windowStart = strtotime( "$day $hour:30:00" );
if( ++$hour > 23 ){
// if we crossed midnight, fix the date and set the hour to 00
$day = date( 'Y-m-d', $timestamp + (24*60*60) );
$hour = '00';
}
$windowEnd = strtotime( "$day $hour:00:00" );
}
// Now $windowStart and $windowEnd are the unix timestamps of your endpoints
There are a few improvements that can be made on this, but that's the basic core.
[Edit: corrected my variable names!]
[Edit: I've revisited this answer because, to my embarrassment, I realized that it didn't handle the last half-hour of a day correctly. I've fixed that issue. Note that $day is fixed by adding a day's worth of seconds to the timestamp -- doing it this way means we don't have to worry about crossing month boundaries, leap days, etc. because PHP will format it correctly for us regardless.]
If you need to get the current time and then apply the rounding (down) of the time, I would do the following:
$now = date('U');
$offset = ($now % 1800);
$now = $now-$offset;
for ($i = 0;$i < 24; $i++)
{
echo date('g:i',$now);
$now += 1800;
}
Or you could round up by adding the offset, and do something more than just echo the time. The for loop then displays the 12 hours of increments. I used the above in a recent project.
I'd use the localtime and the mktime function.
$localtime = localtime($time, true);
$localtime['tm_sec'] = 0;
$localtime['tm_min'] = 30;
$time = mktime($localtime);
Far from my best work... but here's some functions for working with string or unix time stamp.
/**
* Takes a timestamp like "2016-10-01 17:59:01" and returns "2016-10-01 18:00"
* Note: assumes timestamp is in UTC
*
* #param $timestampString - a valid string which will be converted to unix with time()
* #param int $mins - interval to round to (ex: 15, 30, 60);
* #param string $format - the format to return the timestamp default is Y-m-d H:i
* #return bool|string
*/
function roundTimeString( $timestampString, $mins = 30, $format="Y-m-d H:i") {
return gmdate( $format, roundTimeUnix( time($timestampString), $mins ));
}
/**
* Rounds the time to the nearest minute interval, example: 15 would round times to 0, 15, 30,45
* if $mins = 60, 1:00, 2:00
* #param $unixTimestamp
* #param int $mins
* #return mixed
*/
function roundTimeUnix( $unixTimestamp, $mins = 30 ) {
$roundSecs = $mins*60;
$offset = $unixTimestamp % $roundSecs;
$prev = $unixTimestamp - $offset;
if( $offset > $roundSecs/2 ) {
return $prev + $roundSecs;
}
return $prev;
}
This is a solution using DateTimeInterface and keeping timezone information etc. Will also handle timezones that are not a multiple of 30 minutes offset from GMT (e.g. Asia/Kathmandu).
/**
* Return a DateTimeInterface object that is rounded down to the nearest half hour.
* #param \DateTimeInterface $dateTime
* #return \DateTimeInterface
* #throws \UnexpectedValueException if the $dateTime object is an unknown type
*/
function roundToHalfHour(\DateTimeInterface $dateTime)
{
$hours = (int)$dateTime->format('H');
$minutes = $dateTime->format('i');
# Round down to the last half hour period
$minutes = $minutes >= 30 ? 30 : 0;
if ($dateTime instanceof \DateTimeImmutable) {
return $dateTime->setTime($hours, $minutes);
} elseif ($dateTime instanceof \DateTime) {
// Don't change the object that was passed in, but return a new object
$dateTime = clone $dateTime;
$dateTime->setTime($hours, $minutes);
return $dateTime;
}
throw new UnexpectedValueException('Unexpected DateTimeInterface object');
}
You'll need to have created the DateTime object first though - perhaps with something like $dateTime = new DateTimeImmutable('#' . $timestamp). You can also set the timezone in the constructor.
Math.round(timestamp/1800)*1800
As you probably know, a UNIX timestamp is a number of seconds, so substract/add 1800 (number of seconds in 30 minutes) and you will get the desired result.
Here's a more semantic method for those that have to make a few of these, perhaps at certain times of the day.
$time = strtotime(date('Y-m-d H:00:00'));
You can change that H to any 0-23 number, so you can round to that hour of that day.