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https://www.php.net/manual/en/function.mktime.php
If you ever had to 'fix' a time by calculating midnight to add the correct number of seconds, then you are doing it wrong. Luckily, knowing is not a requirement, because DateTime and friends exists, removing the complexity for you. So if given a choice of mktime($seconds, $minutes, $hours+1); and $datetime->modify('+1 hour'); or $datetime->add('P1H');
https://stackoverflow.com/questions/1124752/add-13-hours-to-a-timestamp
Alternatively, you could do it using native PHP4 functions such as: [faster, less accurate: doesn't account for leap seconds/time zone changes etc] $datestamp=strtotime('2009-07-14 02:00:00'); // It'll probably be better using mktime $datestamp=$datestamp+(60*60*13); // 60 seconds times 60 minutes times 13 hours or [slower, more accurate]
https://www.w3schools.com/php/func_date_mktime.asp
PHP Version: 4+ PHP Changelog: PHP 7.1: The is_dst parameter is removed. PHP 5.3.0: Throws E_DEPRECATED if the is_dst parameter is used PHP 5.1: The is_dst parameter was deprecated. If mktime() is called with no arguments, it now throws E_STRICT notice. Use the time() function instead.
https://my-sliit.blogspot.com/2008/09/how-to-add-date-and-time-using-php.html
When you need to add time or add date, you don't need to explode your time string and add time or date separately for each part, you can simply use php's powerful mktime () function to do all the work. <?php. echo 'Original Date/Time <br />'; //mktime (hour,minute,second,month,day,year) echo date ("h:i:s d-m-Y", mktime (10, 15, 20, 8, 20, 2008));
https://thisinterestsme.com/add-hours-php/
Adding hours onto a date and time using PHP’s date and time functions. Take a look at the following example, which is intentionally verbose: //Get the current time in Unix. $currentTime = time (); //The amount of hours that you want to add. $hoursToAdd = 2; //Convert the hours into seconds. $secondsToAdd = $hoursToAdd * (60 * 60); //Add the seconds onto the current Unix timestamp. …
https://dcblog.dev/quick-way-to-add-hours-and-minutes-with-php
Quick way to add hours and minutes with PHP. The following is really easy way to add days, minutes, hours and seconds to a time using PHP. Using the date function to set the format of the date to be returned then using strtotime to add the increase or decrease of time then after a comma use another strtotime passing in the start date and time. //set timezone date_default_timezone_set ('GMT'); …
https://stackoverflow.com/questions/2767068/adding-30-minutes-to-time-formatted-as-hi-in-php
$startTime = date("H:i",strtotime('-30 minutes',$time)); $endTime = date("H:i",strtotime('+30 minutes',$time)); If I pass through 10:00 as $time and echo out both $startTime and $endTime I get: $startTime = 00:30 $startTime = 01:30
https://www.php.net/manual/en/datetime.add.php
// recalc 2020-03-29 03:59:00 // -(12*60+(11+2)*1440+21*60) = -(20701 min) = = 29.3.2020 2:59(not exist => no-equivalent add of one hour) => 29.3.2020 3:59 // easter 2020-04-12 13:00:00 // Recalc add 60 minutes, because the hour does not exist.) // recalc 2020-03-29 03:00:00 // -(12*60+(11+2)*1440+21*60 min)= -(20700 min) = 29.3.2020 3:00
https://www.php.net/manual/en/function.time.php
If you want to create a "rounded" time stamp, for example, to the nearest 15 minutes use this as a reference: <?php. $round_numerator = 60 * 15 // 60 seconds per minute * 15 minutes equals 900 seconds. //$round_numerator = 60 * 60 or to the nearest hour. //$round_numerator = 60 * …
https://www.w3schools.com/php/php_date.asp
Create a Date With mktime() The optional timestamp parameter in the date() function specifies a timestamp. If omitted, the current date and time will be used (as in the examples above). The PHP mktime() function returns the Unix timestamp for a date. The Unix timestamp contains the number of seconds between the Unix Epoch (January 1 1970 00:00:00 GMT) and the time specified.
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