Round datetime to last hour - php

Question

I tried to look for this but I could not find good example of this what im trying to do.
I got datetime values in MySQL database that has to be rounded down when that value is on use.
Example, all these values:
2013-04-20 07:14:42
2013-04-20 07:19:51
2013-04-20 07:37:26
2013-04-20 07:46:28
2013-04-20 07:59:44
Should be rounded down to:
2013-04-20 07:00:00
And
2013-04-20 16:25:34
should be:
2013-04-20 16:00:00 etc...
PHP code that gets date value:
$d = strtotime($row["date"]);
So, how its possible to round down datetime value?

Answer 1

Try this,
$date = "2013-04-20 16:25:34";
echo date("Y-m-d H:00:00",strtotime($date));
CodePad Demo.

Answer 2

If you are using PHP's Carbon DateTime library (which you really should - https://github.com/briannesbitt/Carbon )
You can achieve it easily using
Carbon::now()->minute(0)->second(0);

Answer 3

Since you already have a Unix timestamp $d, most efficient way is to use only arithmetic instead of date functions - especially if you're going to loop through a result set.
$hourTimestamp = $d - ($d % 3600);
Modulo operator gives you the remainder which you subtract from the timestamp to get hour timestamp.

Answer 4

In that case a simple substr could do:
echo substr($date, 0, 13) . ":00:00";

Answer 5

Refering to #Dayson response, this is a better way to round datetime to last hour with Carbon
$dt = Carbon::create(2012, 1, 31, 15, 32, 45);
echo $dt->startOfHour(); // 2012-01-31 15:00:00
check the Modifier section in Carbon Doc

Answer 6

For those who follow (much later!): Carbon has an easy way to do this
$date = (new Carbon($row['date']))->minute(0)->second(0)->getTimestamp();

Answer 7

you can use
date and strtotime function function to achieve this, simply already change your minutes and second accordling
$date = '2013-04-20 07:14:42';
$newdate = date('Y-m-d H:00:00', strtotime($date));
echo $newdate;
this will output
2013-04-20 07:00:00

Answer 8

This writes the date to a string by outputting directly 00:00 as minutes and seconds instead of writing i:s:
$date = date("Y-m-d H:00:00", $d);
Or do you need it as unix timestamp? Then cut the minutes and the seconds off (always the last 5 bytes) and replace them by 00:00.
$d = strtotime(substr($row["date"], 0, -5)."00:00"));

Answer 9

strtotime() gives you a Unix timestamp which is the number of seconds since 1970-01-01 00:00:00.
What if just divided by 3600 seconds (seconds equivalent to 1 hour) and ignore the remainders (the minutes and seconds you do want)?
$d = strtotime($row["date"]);
$rounded_d = intval($d / 3600);
$formatted_rounded_d = date('Y-m-d H:i:s', $rounded_d)

Answer 10

I would use DateTime's setTime() method in a function like this.
<?php
/**
* #param \DateTime $dateTime
*
* #return \DateTime
*/
function roundDownToHour(\DateTime $dateTime)
{
$dt = $dateTime; // clone
return $dt->setTime(
$dateTime->format("H"),
0,
0
);
}
$testDate = date("Y-m-d H:i:s", mktime(9, 59, 59, 1, 30, 2019));
$roundedDownToHour = roundDownToHour(new \DateTime($testDate));
var_dump($testDate); //=> 2019-01-30 9:59:59
var_dump($roundedDownToHour->format("Y-m-d H:i:s")); //=> 2019-01-30 09:00:00
Which results to the following.
// the results
string(19) "2019-01-30 09:59:59"
string(19) "2019-01-30 09:00:00"

Answer 11

It's important you use a built-in PHP function for rounding times to take into account the date as well as the time. For example 2020-10-09 23:37:35 needs to become 2020-10-10 00:00:00 when rounding up to nearest hour.
Round time to nearest hour:
$time = '2020-10-09 23:37:35';
$time = date("Y-m-d H:i:s", round(strtotime($time) / 3600) * 3600); // 2020-10-10 00:00:00
$time = '2020-10-09 23:15:35';
$time = date("Y-m-d H:i:s", round(strtotime($time) / 3600) * 3600); // 2020-10-09 23:00:00
Round time to nearest 20 minute increment:
$time = '2020-10-09 23:15:35';
$time = date("Y-m-d H:i:s", ceil(strtotime($time) / (60*20))*(60*20)); // 2020-10-09 23:20:00
$time = '2020-10-09 23:41:35';
$time = date("Y-m-d H:i:s", ceil(strtotime($time) / (60*20))*(60*20)); // 2020-10-10 00:00:00
If you need to round down to nearest 20 minute increment, change ceil to floor e.g
$time = date("Y-m-d H:i:s", floor(strtotime($time) / (60*20))*(60*20)); // 2020-10-09 23:40:00
If you need to round time to another minute increment you can simply do:
$time = date("Y-m-d H:i:s", ceil(strtotime($time) / (60*15))*(60*15)); // 2020-10-09 23:45:00